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1 April 2022 Mid-IR high harmonic conversion in polycrystalline zinc selenide in the picosecond regime
Christopher B. Marble, Vladislav V. Yakovlev
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Proceedings Volume PC11985, Nonlinear Frequency Generation and Conversion: Materials and Devices XXI; PC119850V (2022) https://doi.org/10.1117/12.2610958
Event: SPIE LASE, 2022, San Francisco, California, United States
Abstract
High harmonic generation (HHG) is readily achieved by focusing mid-infrared (mid-IR), femtosecond laser pulses into polycrystalline Zinc Selenide (p-ZnSe). In this high-power regime (>> 100 GW/cm2), the HHG harmonics are self-phase modulated into a continuum. In this talk, we explore mid-IR frequency conversion in p-ZnSe in a low-power regime (1 – 100 GW/cm2) using mid-IR, 30 picosecond pulses which results in spectrally isolated visible and near-IR harmonics. In this regime, harmonic intensities clearly decrease with harmonic order with conversion efficiencies of 10-4 to 10-12 for second to ninth harmonics while retaining a non-perturbative character consistent with frequency conversion between harmonics permitted via random quasi-phase matching.
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Christopher B. Marble and Vladislav V. Yakovlev "Mid-IR high harmonic conversion in polycrystalline zinc selenide in the picosecond regime", Proc. SPIE PC11985, Nonlinear Frequency Generation and Conversion: Materials and Devices XXI, PC119850V (1 April 2022); https://doi.org/10.1117/12.2610958
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KEYWORDS
Mid-IR
Picosecond phenomena
Zinc
Frequency conversion
Visible radiation
Femtosecond phenomena
High harmonic generation
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