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Optical coherence and hyperfine structure of the 7F0-5D0 transition in EuCaWO4

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Pith's one-line read Eu3+ ions in CaWO4 occupy four crystal-field sites with optical coherence times of 105–114 µs and hyperfine hole lifetimes up to 1215 s at 3 K.

desk verdict A solid new spectroscopic dataset for Eu3+:CaWO4, but the headline minute-long spin lifetimes rest on an unvalidated hole-recovery assignment. read the letter →

arxiv 2501.16407 v2 pith:ASWHG2TO submitted 2025-01-27 cond-mat.mtrl-sci

Xiantong An , Weiye Sun , Zhehao Xu , Wanting Xiao , Miaomiao Ren , Mucheng Guo , Shuping Liu , Fudong Wang
show 1 more author
Manjin Zhong
This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords Eu3+:CaWO4spectralholeburningphotonechohyperfinestructureopticalcoherencequantummemoryrare-earthdopedcrystalchargecompensation
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper establishes that europium-doped calcium tungstate, a crystal whose magnetic noise comes almost entirely from the 14% abundant 183W isotope, is a viable low-nuclear-spin host for rare-earth optical quantum memory. At 3 K it finds four distinct crystal-field environments for Eu3+ ions and characterizes the $^7F_0 \leftrightarrow {}^5D_0$ optical transition in each, with inhomogeneous linewidths of 2.24–3.85 GHz and optical coherence times of 105–114 µs. Using single- and dual-frequency spectral hole burning, it resolves the hyperfine splittings of both europium isotopes in the ground and excited states and reports ground-hyperfine spectral hole lifetimes from 688 s to 1215 s. A sympathetic reader would care because these are the raw spectroscopic ingredients—microsecond optical coherence plus hyperfine storage on the scale of tens of minutes—needed to build an optical quantum memory.

What carries the argument

The object doing the work is the $^7F_0 \leftrightarrow {}^5D_0$ transition of Eu3+ sitting at the Ca2+ site of CaWO4, probed with two-pulse photon echoes and with single- and dual-frequency spectral hole burning. The echo decay is analyzed with the Mims model $A = A_0 \exp[-(\tau/T_2)^x]$, which yields the $T_2$ values and an exponent $x$ indicating spectral diffusion, while the hole-burning spectra map the hyperfine side-holes and anti-holes onto the ground and excited level ladders. The level ordering is fixed through the effective quadrupole Hamiltonian $H_Q = D(I_z^2 - I(I+1)/3) + E(I_x^2 - I_y^2)$, whose fitted $D$ and $E$ values are the quantitative output that ties the observed frequency differences to the two europium isotopes.

What would settle it

Measure the spectral-hole refilling curve at line center for Peak C at 3 K while varying the probe intensity from 0.1 to 5 mW and repeating after burning with two different laser powers; if the inferred $T_{1,\mathrm{spin}}$ changes with probe power or deviates from a single exponential tied to the known ground hyperfine splittings, the claimed 688–1215 s lifetimes are contaminated by spectral diffusion, optical repumping, or background drift rather than being pure hyperfine population decay.

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Extended reading notes

Core claim

The central claim is that a 0.1 at.% Eu3+:CaWO4 crystal at 3 K contains four spectroscopically distinct Eu3+ sites, each with its own $^7F_0 \leftrightarrow {}^5D_0$ line near 580.8 nm and its own hyperfine ladder. For the strongest site (Peak C), the paper determines the full hyperfine structure of 151Eu and 153Eu in both the ground and excited states, assigns the effective quadrupole constants, and shows the isotope splitting ratio of about 2.55 matches the known quadrupole moment ratio. It further reports optical $T_2$ values of 105–114 µs across the four sites and spectral hole lifetimes of 688–1215 s, attributing the four sites to charge compensation via calcium vacancies. If correct, Eu3+:CaWO4 is a newly characterized low-nuclear-spin crystal that combines sub-120 µs optical coherence with hyperfine storage times of up to about 20 minutes.

Load-bearing premise

The quantitative hyperfine lifetimes rest on the assumption that the spectral hole burned at line center refills only by true hyperfine population relaxation; if spectral diffusion, laser-induced optical pumping, or slow background absorption changes also refill the hole, the reported 688–1215 s values do not measure the spin lifetime.

Editorial extensions

If this is right

  • At 3 K, all four Eu3+ sites show optical coherence times above 100 µs, so the $^7F_0 \leftrightarrow {}^5D_0$ transition is coherent enough to support echo-based memory sequences.
  • Ground-hyperfine hole lifetimes of 688–1215 s imply spectral holes persist for up to about 20 minutes, setting the storage-time ceiling for hyperfine-level storage in this host.
  • Peak B and Peak D, with hole lifetimes of 1161 s and 1215 s, are the most attractive frequency channels for long-lived storage among the four sites.
  • The measured isotope splitting ratio of roughly 2.55 for Peak C matches the known 153Eu/151Eu quadrupole moment ratio, which supports the assignment of the hyperfine features.
  • Below roughly 10 K, the Raman phonon contribution to the homogeneous linewidth is negligible, so low-temperature operation keeps the transition near its residual 2–4 GHz inhomogeneous linewidth.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Editorial extension: if the 1215 s hole lifetime reflects genuine hyperfine population decay, then the four sites are effectively four frequency-addressable storage channels in one crystal, and a frequency-selective memory could be written into Peak B or Peak D to use the longest storage times.
  • Editorial extension: the paper stops at spectroscopy; a direct testable next step is to write an atomic frequency comb or spin-wave echo on Peak C and measure retrieval efficiency, which would show whether the measured coherence and hyperfine lifetimes actually support storage and recall.
  • Editorial extension: a magnetic-field dependence of the hole refilling rate would separate intrinsic hyperfine relaxation from electron-spin-mediated spectral diffusion, an experiment not reported here.
  • Editorial extension: if the four sites are caused by calcium vacancies as the paper argues, co-doping with Na+ should suppress or rearrange the sites; observing the spectrum collapse under Na+ co-doping would directly test the charge-compensation explanation.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

1 major / 7 minor

Summary. The paper reports a low-temperature spectroscopic study of Eu3+ ions doped into CaWO4 at 0.1 at.%. Using fluorescence excitation, absorption, two-pulse photon echo, and single- and dual-frequency spectral hole burning, the authors identify four distinct optical transitions near 580.8 nm (peaks A–D), which they attribute to different crystal-field environments arising from charge compensation. They measure inhomogeneous linewidths of 2.2–3.9 GHz, optical coherence times T2 ≈ 105–114 µs, and fluorescence lifetimes T1 ≈ 518–597 µs. The hyperfine structure of the 7F0 and 5D0 states is resolved for both 151Eu and 153Eu isotopes, and effective quadrupole parameters D and E are extracted for Peak C. Using line-center hole-burning recovery, they report ground-state hyperfine lifetimes T1,spin between 688 and 1215 s. The paper concludes that Eu3+:CaWO4 is a promising candidate for optical quantum memory.

Significance. If the results hold, the paper provides a useful characterization of a new low-nuclear-spin-density host for rare-earth quantum memories. The use of established spectroscopic techniques and the internal consistency of the isotope splitting ratios (≈2.55, matching the known quadrupole moment ratio) are strengths. The measured optical coherence times of ~100 µs and fluorescence lifetimes of ~0.5 ms, together with the hyperfine level structure, constitute a valuable dataset for future device-oriented studies. However, the long T1,spin values that drive the quantum memory motivation require additional experimental support.

major comments (1)
  1. [3.4] The ground-state hyperfine lifetimes T1,spin reported in Table 1 (688–1215 s) are inferred solely from the recovery of a spectral hole burned at the absorption line center. The paper provides no control experiments to exclude hole refilling by spectral diffusion (e.g., from 183W nuclear spin flips) or by optical pumping from the 1 mW probe beam itself, nor does it report tests varying burn duration, burn/probe power, or applied magnetic field. Without such controls, the recovery time cannot be unambiguously assigned to population relaxation among the 7F0 hyperfine levels. Because the long-lived spin storage times underpin the proposed quantum memory applications, this missing control is load-bearing and should be addressed with additional measurements or a clear discussion of why these mechanisms are negligible.
minor comments (7)
  1. [3.2] In Eqs. (4) and (5), the homogeneous linewidth is computed as Γhom = 1/(πT2). This relation is exact only for a Lorentzian spectral line (x=1). Since the photon echo decay fits yield x between 1 and 2, the authors should justify this conversion or discuss its effect on the fitted αTPR and Γhom0 values.
  2. [3.3, Table 2] The effective quadrupole parameters D and E are listed without uncertainties and without a description of the fitting procedure that maps the two measured splitting frequencies to the two Hamiltonian parameters. Providing the secular equations or a table of residuals would allow readers to assess the uniqueness and precision of the parameter sets.
  3. [3.1, Abstract] The phrase 'four distinct crystal field environments' is a strong conclusion. The data demonstrate four distinct optical transitions with different hyperfine splittings and polarization behavior, but the microscopic assignment to specific charge-compensation defect configurations is speculative. I recommend wording such as 'four distinct Eu3+ spectral sites' and explicitly identifying the charge-compensation model as tentative.
  4. [2] The text states that a four-pass configuration was used for absorption and SHB, but Section 3.3 mentions a five-pass arrangement for Peak D. Please clarify when and why the number of passes was changed, and state the effective interaction length for each measurement.
  5. [Fig. 3a] The axis label 'Time delay (7s)' appears to contain a typo; it should likely read 'Time delay (µs)'. Also, please define in the caption whether τ denotes the pulse separation or the total evolution time in Eq. (4).
  6. [References] References [16] and [24] appear to be non-archival preprints without journal or arXiv identifiers; please provide the arXiv IDs or published versions for completeness.
  7. [Various] There are several typographical and grammatical issues ('All the lineshapes of all four peaks' in Section 3.1, 'the hyperfine transitions among the four peaks exhibit inconsistent' in Section 3.3, the duplicate use of 'lineshapes'). A careful proofread would improve readability.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: all quantitative results are direct measurements or standard fits, with no load-bearing self-citation chain.

full rationale

The paper's derivation chain is experimental rather than predictive. Four crystal-field environments are observed directly as four excitation peaks (Fig. 1b). Hyperfine splittings are read from single-frequency spectral-hole-burning positions (e.g., 19.7 MHz and 21.6 MHz for 151Eu in Peak C), and the D and E parameters in Table 2 are fits to those measured transition frequencies. The dual-frequency SHB results independently determine the ordering of hyperfine levels, so the level-structure assignment does not presuppose the fitted Hamiltonian parameters. The reported isotope splitting ratio of about 2.55 is a comparison of measured splittings with the known 153Eu/151Eu quadrupole moment ratio; it is a consistency check, not a prediction derived from fitted inputs. Self-citations (refs. 8 and 9) appear only in the introductory survey of prior work on known hosts and are not load-bearing for any specific claim in this paper. The Mims echo-decay model and the McCumber-Sturge phonon-broadening expressions are standard external results, not author-specific ansatze. The only interpretive step is labeling line-center hole-recovery times as ground-hyperfine lifetimes T1,spin; this is a physical assumption that would merit control experiments, but it is not circular because the hole decay is measured directly and independently of the claimed lifetime interpretation. No equation in the paper reduces to another by construction, and no fitted parameter is renamed as a prediction.

Assumptions & free parameters 8 free parameters · 5 assumptions · 0 invented entities

The central claims rest on standard spectroscopic models (Mims decay, two-phonon Raman, quadrupole Hamiltonian) and on domain assumptions about site assignment and charge compensation. The free parameters are all fitted to the measured spectra; they characterize the material rather than being pulled from a hat. No new entities are postulated.

free parameters (8)
  • Γ0 = 3.76 ± 0.03 GHz
    Residual inhomogeneous linewidth for Peak C in Eq. 2 fit to temperature-dependent linewidth data (Fig. 2b).
  • α = (0.76 ± 0.24) × 10^3 GHz
    Two-phonon Raman linewidth coefficient for Peak C in Eq. 2, fitted to the same data.
  • ν0 = 516188.10 ± 0.18 GHz
    Extrapolated zero-temperature transition frequency for Peak C in Eq. 3 fit.
  • ᾱ = (2.60 ± 0.22) × 10^3 GHz
    Phonon shift coefficient in Eq. 3.
  • Γhom0 = 2.74 to 3.12 kHz across peaks
    Residual homogeneous linewidth per peak from Eq. 5 fits to T2(T) data (Table 1).
  • αTPR = 3.61 to 10.26 × 10^-6 Hz/K^7 across peaks
    Two-phonon Raman coupling per peak from Eq. 5 (Table 1).
  • spectral diffusion exponent x = between 1 and 2
    Nuisance parameter in Mims echo decay fit, Eq. 4.
  • Dg, Eg, De, Ee for 151Eu and 153Eu = See Table 2, e.g. Dg = -6.0 MHz for 151Eu
    Quadrupole Hamiltonian parameters fitted to measured hyperfine splittings via Eq. 6.
assumptions (5)
  • domain assumption Eu3+ substitutes at the Ca2+ site with local S4 symmetry.
    Used throughout to interpret spectra; based on ionic radii similarity and prior crystal structure knowledge, Section 2.
  • domain assumption Charge compensation in the undoped-grown crystal occurs via calcium vacancies (3Ca2+ = 2Eu3+ + vacancy), not Na+ co-doping.
    Invoked in Section 3.3 to explain four distinct sites; no direct structural verification.
  • standard math The effective quadrupole spin Hamiltonian HQ = D(Iz^2 - I(I+1)/3) + E(Ix^2 - Iy^2) describes the zero-field hyperfine structure.
    Used in Section 3.3 to fit D and E from measured splittings; standard formalism.
  • domain assumption The Mims exponential model A = A0 exp[-(τ/T2)^x] describes the photon echo decay.
    Used in Section 3.2 to extract T2; standard for spectral diffusion.
  • domain assumption Line broadening above 6 K is dominated by two-phonon Raman scattering with a T^7 dependence (Eq. 5).
    Used to fit homogeneous linewidth versus temperature in Fig. 3c.

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Cite this review

Pith. "Pith review of Optical coherence and hyperfine structure of the 7F0-5D0 transition in EuCaWO4." pith.science (2026). https://pith.science/paper/ASWHG2TO

@misc{pith2026250116407,
  author       = {Pith},
  title        = {Pith review of: Optical coherence and hyperfine structure of the 7F0-5D0 transition in EuCaWO4},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/ASWHG2TO}},
  note         = {Machine review of arXiv:2501.16407}
}
read the original abstract

Rare-earth ions doped in crystals with low nuclear-spin densities are highly promising candidates for quantum technology applications. In this study, we investigated the spectroscopic properties of the 7F0 - 5 D0 optical and the hyperfine transitions of Eu3+ ions in a CaWO4 crystal, where the nuclear spin arises solely from the 183W isotope, with a natural abundance of 14%. At a temperature of 3 K, we experimentally identified four distinct crystal field environments for Eu3+ ions in a 0.1 at.% Eu3+ doped CaWO4 crystal. The optical coherence properties of Eu3+ ions in these environments were characterized. Additionally, we resolved the hyperfine structures in the 7F0 ground state and 5D0 excited state, and determined the 7F0 ground state lifetimes using spectral hole-burning techniques. These findings highlight the significant potential of Eu3+:CaWO4 for optical quantum memory applications.

Figures

Figures reproduced from arXiv: 2501.16407 by the authors.

Figure 1
Figure 1. (a) Hyperfine structures of the 7F0 ↔ 5D0 transition. (b) Fluorescence spectra in which k ∥ c, fitted through Lorentzian function, with the results shown in [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. (a) Polarization characteristics of the excitation spectra, in [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. (a) Photon echo decay of the Peak C and experimental pulse sequence. Considering that the coherence times of four peaks are sim￾ilar, this paper presents only the photon echo decay of the Peak C and provides the fitting results for the coherence times of four peaks, as shown in [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: In zero magnetic field, the schematic of the single-frequency [PITH_FULL_IMAGE:figures/full_fig_p005_4.png]
Figure 5
Figure 5. Figure 5: Under zero magnetic field conditions, the schematic diagram [PITH_FULL_IMAGE:figures/full_fig_p005_5.png]
Figure 6
Figure 6. Figure 6: The dual-frequency SHB technique was used to determine the order of hyperfine energy levels for both ground and excited states. Panels (a), (c), (d), and (f) display two possible hyperfine energy level configurations with their corresponding pump laser pairs; while pan…

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Works this paper leans on

44 extracted references · 44 canonical work pages

  1. [1]

    Microwave multimode memory with an erbium spin ensemble

    S Probst, H Rotzinger, A V Ustinov, and PA Bushev. Microwave multimode memory with an erbium spin ensemble. Physical Review B, 92(1):014421, 2015

    work page 2015

  2. [2]

    Williamson, Yu-Hui Chen, and Jevon J

    Lewis A. Williamson, Yu-Hui Chen, and Jevon J. Longdell. Magneto-optic modulator with unit quantum e fficiency. Phys. Rev. Lett., 113:203601, Nov 2014

    work page 2014

  3. [3]

    Coherent frequency up- conversion of microwaves to the optical telecommunications band in an Er:YSO crystal

    Xavier Fernandez-Gonzalvo, Yu-Hui Chen, Chunming Yin, Sven Rogge, and Jevon J Longdell. Coherent frequency up- conversion of microwaves to the optical telecommunications band in an Er:YSO crystal. Physical Review A, 92(6):062313, 2015

    work page 2015

  4. [4]

    Frequency upconversion in rare earth ions

    Vineet Kumar Rai. Frequency upconversion in rare earth ions. In Amin H. Al-Khursan, editor, Solid State Laser , chapter 7. IntechOpen, Rijeka, 2012

    work page 2012

  5. [5]

    Fraval, M

    E. Fraval, M. J. Sellars, and J. J. Longdell. Dynamic decoher- ence control of a solid-state nuclear-quadrupole qubit. Phys. Rev. Lett., 95:030506, Jul 2005

    work page 2005

  6. [6]

    Hedges, Rose L

    Milo ˇs Ran ˇci´c, Morgan P. Hedges, Rose L. Ahlefeldt, and Matthew J. Sellars. Coherence time of over a second in a telecom-compatible quantum memory storage material. Nature Physics, 14(1):50–54, Jan 2018

    work page 2018

  7. [7]

    One-hour coherent optical storage in an atomic frequency comb memory

    Yu Ma, You-Zhi Ma, Zong-Quan Zhou, Chuan-Feng Li, and Guang-Can Guo. One-hour coherent optical storage in an atomic frequency comb memory. Nature Communications , 12(1):2381, Apr 2021

    work page 2021

  8. [8]

    Sellars, Rose L

    Fudong Wang, Miaomiao Ren, Weiye Sun, Mucheng Guo, Matthew J. Sellars, Rose L. Ahlefeldt, John G. Bartholomew, Juan Yao, Shuping Liu, and Manjin Zhong. Nuclear spins in 7 a solid exceeding 10-hour coherence times for ultra-long-term quantum storage. PRX Quantum, 6:010302, Jan 2025

    work page 2025

Show all 44 references
  1. [9]

    Optically addressable nuclear spins in a solid with a six-hour coherence time

    Manjin Zhong, Morgan Hedges, Rose Ahlefeldt, John Bartholomew, Sarah Beavan, Sven Wittig, Jevon Longdell, and Matthew Sellars. Optically addressable nuclear spins in a solid with a six-hour coherence time. Nature, 517:177–80, 01 2015

    2015

  2. [10]

    Quan- tum information processing using frozen core Y 3+ spins in Eu3+:Y2SiO5

    Manjin Zhong, Rose Ahlefeldt, and Matt Sellars. Quan- tum information processing using frozen core Y 3+ spins in Eu3+:Y2SiO5. New Journal of Physics, 21(1):015001, 2019

    2019

  3. [11]

    Uysal, Mouktik Raha, Songtao Chen, Christo- pher M

    Mehmet T. Uysal, Mouktik Raha, Songtao Chen, Christo- pher M. Phenicie, Salim Ourari, Mengen Wang, Chris G. Van de Walle, Viatcheslav V . Dobrovitski, and Jeff D. Thompson. Co- herent control of a nuclear spin via interactions with a rare-earth ion in the solid state. PRX Quan...

    2023

  4. [12]

    Joseph Heremans, Hosung Seo, Gary Wolfowicz, Christopher P

    Shun Kanai, F. Joseph Heremans, Hosung Seo, Gary Wolfowicz, Christopher P. Anderson, Sean E. Sullivan, Mykyta Onizhuk, Giulia Galli, David D. Awschalom, and Hideo Ohno. General- ized scaling of spin qubit coherence in over 12,000 host mate- rials. Proceedings of the National A...

    2022

  5. [13]

    W. M. Haynes, editor. CRC Handbook of Chemistry and Physics: A Ready-Reference Book of Chemical and Physical Data. CRC Press, Boca Raton, London, and New York, 95th edition, 2014

    2014

  6. [14]

    183W nuclear dipole moment determined by gas-phase nmr spectroscopy

    Piotr Garbacz and Włodzimierz Makulski. 183W nuclear dipole moment determined by gas-phase nmr spectroscopy. Chemical Physics, 498-499:7–11, 2017

    2017

  7. [15]

    Le Dantec, Milo Rani, Sen Lin, E

    M. Le Dantec, Milo Rani, Sen Lin, E. Billaud, V . Ranjan, D. Flanigan, S. Bertaina, T. Chaneli`ere, P. Goldner, and A. Erb. Twenty-three–millisecond electron spin coherence of erbium ions in a natural-abundance crystal. Science Advances, 7, 2021

    2021

  8. [16]

    Uysal, Łukasz Dusanowski, Haitong Xu, Sebas- tian P

    Mehmet T. Uysal, Łukasz Dusanowski, Haitong Xu, Sebas- tian P. Horvath, Salim Ourari, Robert J. Cava, Nathalie P. de Leon, and Jeff D. Thompson. Spin-photon entanglement of a single Er3+ ion in the telecom band, 2024

    2024

  9. [17]

    Coherent spin manipulations in Yb3+: CaWO 4 at x- and w-band epr frequencies

    RM Rakhmatullin, IN Kurkin, GV Mamin, SB Orlinskii, MR Gafurov, EI Baibekov, BZ Malkin, S Gambarelli, S Bertaina, and B Barbara. Coherent spin manipulations in Yb3+: CaWO 4 at x- and w-band epr frequencies. Physical Re- view B, 79(17):172408, 2009

    2009

  10. [18]

    Spec- troscopic investigations of Pr3+: CaWO 4 at liquid-helium tem- peratures

    Tian-Shu Yang, Ming-Xu Su, Jian-Yin Huang, You-Cai Lv, Zong-Quan Zhou, Chuan-Feng Li, and Guang-Can Guo. Spec- troscopic investigations of Pr3+: CaWO 4 at liquid-helium tem- peratures. Physical Review A, 107(2):022802, 2023

    2023

  11. [19]

    Tobar, Ben T

    Elrina Hartman, Michael E. Tobar, Ben T. McAllister, Jeremy Bourhill, and Maxim Goryachev. Precision multi-mode mi- crowave spectroscopy of paramagnetic and rare-earth ion spin defects in single crystal calcium tungstate. Applied Physics Let- ters, 125(16):164001, 10 2024

    2024

  12. [20]

    Enhanced quantum efficiency and thermal stability in CaWO4:Eu3+ phos- phor based on structural modification induced by co-doping Al3+

    Shaojie Bai, Yun Liu, Guoqiang Tan, Wenlong Liu, Dinghan Liu, Rong Wang, Yi Zhu, Sen Ye, and Huijun Ren. Enhanced quantum efficiency and thermal stability in CaWO4:Eu3+ phos- phor based on structural modification induced by co-doping Al3+. Journal of Luminescence, 225:117351, 2020

    2020

  13. [21]

    Luminescence prop- erties of CaWO 4 and CaWO4:Eu3+ nanostructures prepared at low temperature

    Ying Zhang, Aman Abraha, Rong Zhang, Tigran Shahbazyan, Mehri Fadavi, Ezat Heydari, and Qilin Dai. Luminescence prop- erties of CaWO 4 and CaWO4:Eu3+ nanostructures prepared at low temperature. Optical Materials, 84:115–122, 2018

    2018

  14. [22]

    Local electric fields and the paramag- netic resonance of charge-compensated sites in (Ca, Ce)WO 4

    WB Mims and R Gillen. Local electric fields and the paramag- netic resonance of charge-compensated sites in (Ca, Ce)WO 4. The Journal of Chemical Physics, 47(9):3518–3532, 1967

    1967

  15. [23]

    Maria Felinto, Claudia F. C. Malta, Oscar L. Teotonio, Ercules, et al. Photoluminescence of single-phased white light emission materials based on simultaneous Tb 3+, Eu3+ and Dy3+ doping in CaWO4 matrix. Journal of Alloys and Compounds: An Inter- disciplinary Journal of Materi...

    2017

  16. [24]

    Curtin, Sudip KC, Tim Schneider, Lorenz J

    Fabian Becker, Catherine L. Curtin, Sudip KC, Tim Schneider, Lorenz J. J. Sauerzopf, Ibrahim Elzeiny, and Kai M ¨uller. Spec- troscopic investigations of multiple environments in Er:CaWO4 through charge imbalance, 2024

    2024

  17. [25]

    Efficient optical pumping of zeeman spin levels in Nd3+: YVO4

    Mikael Afzelius, Matthias U Staudt, Hugues De Riedmatten, Nicolas Gisin, Olivier Guillot-No ¨el, Philippe Goldner, Robert Marino, Pierre Porcher, Enrico Cavalli, and Marco Bettinelli. Efficient optical pumping of zeeman spin levels in Nd3+: YVO4. Journal of Luminescence, 130(9...

    2010

  18. [26]

    Linewidth and temperature shift of the R lines in ruby

    DE McCumber and MD Sturge. Linewidth and temperature shift of the R lines in ruby. Journal of Applied Physics, 34(6):1682– 1684, 1963

    1963

  19. [27]

    Senyshyn, H

    A. Senyshyn, H. Kraus, V . B. Mikhailik, and V . Yakovyna. Lat- tice dynamics and thermal properties of CaWO 4. Phys. Rev. B, 70:214306, Dec 2004

    2004

  20. [28]

    Observation of a pho- ton echo

    NA Kurnit, ID Abella, and SR Hartmann. Observation of a pho- ton echo. Physical Review Letters, 13(19):567, 1964

    1964

  21. [29]

    W. B. Mims. Phase memory in electron spin echoes, lattice re- laxation effects in CaWO 4: Er, Ce, Mn. Phys. Rev., 168:370– 389, Apr 1968

    1968

  22. [30]

    Temperature and concen- tration dependence of optical dephasing, spectral-hole lifetime, and anisotropic absorption in Eu 3+: Y 2SiO5

    Flurin K ¨onz, Y Sun, CW Thiel, RL Cone, RW Equall, RL Hutcheson, and RM Macfarlane. Temperature and concen- tration dependence of optical dephasing, spectral-hole lifetime, and anisotropic absorption in Eu 3+: Y 2SiO5. Physical Review B, 68(8):085109, 2003

    2003

  23. [31]

    Optical dephasing, hyperfine structure, and hyperfine relaxation associated with the 580.8-nm 7F0 - 5D0 transition of europium in Eu 3+: Y 2O3

    WR Babbitt, A Lezama, and TW Mossberg. Optical dephasing, hyperfine structure, and hyperfine relaxation associated with the 580.8-nm 7F0 - 5D0 transition of europium in Eu 3+: Y 2O3. Physical Review B, 39(4):1987, 1989

    1987

  24. [32]

    Spectral-hole-burning study of the hyperfine interaction in axial Eu3+ centers in CaF2, SrF2, and BaF2

    AJ Silversmith and RM Macfarlane. Spectral-hole-burning study of the hyperfine interaction in axial Eu3+ centers in CaF2, SrF2, and BaF2. Physical Review B, 45(11):5811, 1992

    1992

  25. [33]

    Hole-burning techniques for isolation and study of individual hyperfine transitions in inhomogeneously broadened solids demonstrated in Pr 3+: Y 2SiO5

    Mattias Nilsson, Lars Rippe, Stefan Kr ¨oll, Robert Klieber, and Dieter Suter. Hole-burning techniques for isolation and study of individual hyperfine transitions in inhomogeneously broadened solids demonstrated in Pr 3+: Y 2SiO5. Physical Review B Con- densed Matter and Mater...

    2004

  26. [34]

    Spectral hole-burning spectroscopy in Nd3+: YVO4

    SR Hastings-Simon, M Afzelius, J Min ´aˇr, MU Staudt, B Lau- ritzen, H De Riedmatten, N Gisin, Atia Amari, Andreas Walther, Stefan Kr ¨oll, and et al. Spectral hole-burning spectroscopy in Nd3+: YVO4. Physical Review B Condensed Matter and Mate- rials Physics, 77(12):125111, 2008

    2008

  27. [35]

    Spectroscopic investigations of Eu 3+: Y 2SiO5 for quantum memory applications

    Bjorn Lauritzen, Nuala Timoney, Nicolas Gisin, Mikael Afzelius, Hugues de Riedmatten, Y Sun, RM Macfarlane, and RL Cone. Spectroscopic investigations of Eu 3+: Y 2SiO5 for quantum memory applications. Physical Review B Condensed Matter and Materials Physics, 85(11):115111, 2012

    2012

  28. [36]

    Optical frequency stabilization and optical phase locked loops: golden threads of precision measurement

    Matthew S Taubman. Optical frequency stabilization and optical phase locked loops: golden threads of precision measurement. In 2013 American Control Conference, pages 1488–1505. IEEE, 2013

    2013

  29. [37]

    Photon echoes using atomic frequency combs in Pr: YSO: experiment and semiclassical theory

    Aditya N Sharma, Zachary H Levine, Martin A Ritter, Kumel H Kagalwala, Eli J Weissler, Elizabeth A Goldschmidt, and Alan L Migdall. Photon echoes using atomic frequency combs in Pr: YSO: experiment and semiclassical theory. Optics Express , 31(3):4899–4919, 2023

    2023

  30. [38]

    Michael Palin, Ian H

    Majid Ghaderi, J. Michael Palin, Ian H. Campbell, and Paul J. Sylvester. Rare earth element systematics in scheelite from hydrothermal gold deposits in the kalgoorlie-norseman region, western australia. Economic Geology, 94(3):423–437, 05 1999

    1999

  31. [39]

    Synthesis and optimum luminescence of CaWO4-based red phosphors with codoping of Eu3+ and Na+

    Yiguo Su, Liping Li, and Guangshe Li. Synthesis and optimum luminescence of CaWO4-based red phosphors with codoping of Eu3+ and Na+. Chemistry of Materials, 20(19):6060–6067, Oct 8 2008

    2008

  32. [40]

    Pengfei Jiang, Wenliang Gao, Rihong Cong, and Tao Yang. Structural investigation of the a-site vacancy in scheelites and the luminescence behavior of two continuous solid solutions A1−1.5xEux□0.5xWO4 and A0.64−0.5yEu0.24Liy□0.12−0.5yWO4 (A = Ca, Sr;□ = vacancy). Dalton Trans.,...

    2015

  33. [41]

    A faithful solid-state spin-wave quantum memory for polarization qubits

    Ming Jin, You-Zhi Ma, Zong-Quan Zhou, Chuan-Feng Li, and Guang-Can Guo. A faithful solid-state spin-wave quantum memory for polarization qubits. Science Bulletin, 67(7):676– 678, 2022

    2022

  34. [42]

    MACFARLANE and R.M

    R.M. MACFARLANE and R.M. SHELBY . Chapter 3 - coher- ent transient and holeburning spectroscopy of rare earth ions in solids. In A.A. KAPLY ANSKII and R.M. MACFARLANE, ed- itors, Spectroscopy of Solids Containing Rare Earth Ions , vol- ume 21 of Modern Problems in Condensed Ma...

    1987

  35. [43]

    Structure and luminescence properties of CaWO4- EuO4 (m= Nb, Ta) solid solution

    Su Zhang, Lingling Lv, Hongjie Wang, Chongyang Zhu, Ran Pang, Jing Feng, Da Li, Guanyu Liu, Lihong Jiang, and Chengyu Li. Structure and luminescence properties of CaWO4- EuO4 (m= Nb, Ta) solid solution. Journal of Luminescence , 211:183–192, 2019

    2019

  36. [44]

    Eu 3+ doped CaWO 4 nanophosphor for high sensitivity optical thermometry

    Haihong Xiao and Qingyu Meng. Eu 3+ doped CaWO 4 nanophosphor for high sensitivity optical thermometry. Spec- trochimica Acta Part A: Molecular and Biomolecular Spec- troscopy, 305:123542, 2024. 9

    2024

Pith tools

Reviewed August 10, 2026 · model on record in the stance chip above.