Nonlinear compression of few-cycle multi-mJ 5 µm pulses in ZnSe around zero-dispersion.
Opt Lett
; 49(2): 351-354, 2024 Jan 15.
Article
em En
| MEDLINE
| ID: mdl-38194566
ABSTRACT
We present a compact nonlinear compression scheme for the generation of millijoule few-cycle pulses beyond 4 µm wavelength. For this purpose 95â
fs pulses at 5 µm from a 1â
kHz midwave-IR optical parametric chirped pulse amplifier (OPCPA) are spectrally broadened due to a self-phase modulation in ZnSe. The subsequent compression in a bulk material yields 53â
fs pulses with 1.9â
mJ energy. The compression succeeds efficiently with only slight beam distortions and an energy throughput of 85%, which results in a peak power of 34â
GW. The nonlinear refractive index of ZnSe was derived from the nonlinear compression and self-focusing measurements. Furthermore, we explore to which extent multiphoton absorption affects the nonlinear compression regime.
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article