Open AccessInvestigation of Femtosecond IR Radiation Two-Photon Absorption by Pump-Probe Method in GaAs (001) Plate Reflection
Author(s) -
Н. Н. Рубцова,
Г. М. Борисов,
Д. В. Ледовских
Publication year - 2019
Publication title -
sibirskij fizičeskij žurnal
Language(s) - English
Resource type - Journals
ISSN - 2541-9447
DOI - 10.25205/2541-9447-2019-14-4-82-90
Subject(s) - femtosecond , optics , materials science , radiation , laser , absorption (acoustics) , gallium arsenide , photon , optoelectronics , wavelength , physics
The reflection of probe infrared femtosecond radiation pulses from a gallium arsenide substrate of the (001) orientation in the presence of more powerful pump pulses of the same radiation with a peak power of up to 1 GW/cm2 was investigated. A Yb3+:KY(WO4)2 laser with a central wavelength of 1 035 nm, a repetition rate of 70 MHz, a pulse duration of 130 fs, and an average power of not more than 0.9 W worked in the GaAs transparency region. The experimental dependence of the recorded signal on the pump radiation intensity is in qualitative agreement with the model dependence for two-photon absorption. The results are important for the correct interpretation of reflectivity kinetics of quantum wells.