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13 March 2024 Octave-spanning, dispersion-free adiabatic frequency converters
Connor Davis, Dylan Heberle, Noah Flemens, Jeffrey Moses
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Proceedings Volume PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; PC128690P (2024) https://doi.org/10.1117/12.3006258
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
Frequency converting pulses with bandwidths approaching an octave remains a daunting technical challenge. We show that by tailoring the frequency-dependent photon conversion position in a chirped quasi-phase matched crystal, it becomes possible to frequency shift ~10-fs, ~1 μJ pulses efficiently and uniformly, while intrinsically customizing their dispersion. We employed this technique to design frequency downshifters that apply zero group delay dispersion to a compressed input pulse. For example, we demonstrated conversion of an 11.1-fs, 680-820 nm pulse into an octave-spanning, 11.6-fs, 2-4 μm output pulse with 70% internal photon conversion. Within some constraints, it is also possible to apply custom dispersion of multiple order, or to pre- or post-compensate for other dispersive elements in an experiment. A general approach that also works for sum frequency generation, this technique thus provides significant flexibility in selecting frequency conversion pathways and designing a hyperspectral architecture with multi-color few- and single-cycle pulses.
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Connor Davis, Dylan Heberle, Noah Flemens, and Jeffrey Moses "Octave-spanning, dispersion-free adiabatic frequency converters", Proc. SPIE PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, PC128690P (13 March 2024); https://doi.org/10.1117/12.3006258
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KEYWORDS
Dispersion
Ultrafast phenomena
Frequency conversion
Frequency converters
Design and modelling
Ultrafast laser spectroscopy
Spectroscopes
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