The paper demonstrates an AlN waveguide generating an octave-spanning supercontinuum from 490 to 1100 nm and a 405-425 nm SHG band with sub-nJ pulses.
Beyond 100 THz-spanning ultraviolet frequency combs in a non-centrosymmetric crystalline waveguide
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abstract
Ultraviolet frequency combs enable applications ranging from precision spectroscopy to atomic clocks by addressing the electronic transitions of atoms and molecules. Access to ultraviolet light via integrated nonlinear optics is usually hampered by the strong material dispersion and large waveguide attention in the ultraviolet region. Here we demonstrate a simple route to chip-scale ultraviolet comb generators, simultaneously showing a gap-free frequency span of ~128 terahertz and supercontinuum sourced by an ultrafast fiber laser. The simultaneous cubic and quadratic nonlinear processes are implemented in single-crystalline aluminum nitride thin films, where a chirp-modulated taper waveguide is patterned to ensure a broad phase matching. The heterodyne beatnote characterization suggests that both the near-visible and ultraviolet supercontinuum combs maintain a high degree of coherence. Our approach is also adaptable to other non-centrosymmetric photonic platforms for ultrafast nonlinear optics with scalable bandwidth.
fields
physics.optics 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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On-chip directional octave-spanning supercontinuum generation from high order mode in near ultraviolet to infrared spectrum using AlN waveguides
The paper demonstrates an AlN waveguide generating an octave-spanning supercontinuum from 490 to 1100 nm and a 405-425 nm SHG band with sub-nJ pulses.