Optical Gain in Solids after Ultrafast Strong-Field Excitation

Broadband Photoconductive Sampling in Gallium Phosphide

“…Likewise, to calculate the response function of LPS (Figure 4b), we modeled the interaction of a VIS-UV few-cycle intense pulse and a NIR infrared drive pulse in GaP using the method described in ref. [36]. To this end, we solved the 3D time-dependent Schrödinger equation in the stationary basis of Kohn-Sham orbitals.…”

“…In order to derive the criteria for linear injection, the VIS-UV induced charge density was calculated in GaP as a function of peak field strengths of the laser using the method described in ref. [36]. The dependence of the computed charge density on the peak electric field was compared with a polynomial scaling characteristic of both single and multi-photon absorption.…”