1.
Opt Lett
; 49(6): 1433-1436, 2024 Mar 15.
Article
in English
| MEDLINE
| ID: mdl-38489418
ABSTRACT
We demonstrate loss-free generation of 3â mJ, 1â kHz, few-cycle (5â fs at 750â nm central wavelength) double pulses with a pulse peak separation from 10 to 100â fs, using a helium-filled hollow core fiber (HCF) and chirped mirror compressor. Crucial to our scheme are simulation-based modifications to the spectral phase and amplitude of the oscillator seed pulse to eliminate the deleterious effects of self-focusing and nonlinear phase pickup in the chirped pulse amplifier. The shortest pulse separations are enabled by tunable nonlinear pulse splitting in the HCF compressor.