Polycrystalline ZnSe is an exciting source of broadband supercontinuum and high-harmonic generation via random quasi phase matching, exhibiting broad transparency in the mid-infrared (0.5 − 20 μ m ). In this work, the effects of wavelength, pulse power, intensity, propagation length, and crystallinity on supercontinuum and high harmonic generation are investigated experimentally using ultrafast mid-infrared pulses. Observed harmonic conversion efficiency scales linearly in propagation length, reaching as high as 36%. For the first time to our knowledge, n 2 is measured for mid-infrared wavelengths in ZnSe: n 2 (λ = 3.9 μ m) = (1.2 ± 0.3) ×10 −14 cm 2 / W . Measured n 2 is applied to simulations modeling high-harmonic generation in polycrystalline ZnSe as an effective medium.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics