At 6.6 K, a Ti:PPLN waveguide phase-matches a visible-pumped, widely non-degenerate down-conversion near its designed wavelengths, but pyroelectric and photorefractive effects degrade TM modes and cause small, unpredictable spectral variations.
Packaged Cryogenic Photon Pair Source Using an Effective Packaging Methodology for Cryogenic Integrated Optics
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abstract
A new cryogenic packaging methodology that is widely applicable to packaging any integrated photonics circuit for operation at both room temperature and cryogenic temperature is reported. The method requires only equipment and techniques available in any integrated optics lab and works on standard integrated photonic chips. Our methodology is then used to enable the measurement of a single photon pair sourced based on a silicon ring resonator at cryogenic temperatures. When operating at 5.9 K, this source is measured to have a peak pair generation rate 183 times greater then at room temperature in the CL-band.
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Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides
At 6.6 K, a Ti:PPLN waveguide phase-matches a visible-pumped, widely non-degenerate down-conversion near its designed wavelengths, but pyroelectric and photorefractive effects degrade TM modes and cause small, unpredictable spectral variations.