Open AccessMeasurements of nonlinear absorption of intense 10 µm laser pulses in n-Ge, GaAs, and ZnSe
Author(s) -
Daniel Matteo,
J. Pigeon,
Sergei Tochitsky,
I. BenZvi,
C. Joshi
Publication year - 2020
Publication title -
applied optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 197
eISSN - 2155-3165
pISSN - 1559-128X
DOI - 10.1364/ao.399513
Subject(s) - algorithm , analytical chemistry (journal) , computer science , chemistry , chromatography
We study the nonlinear absorption of high-power 10 µm radiation propagating through n -Ge, GaAs, and ZnSe materials widely used in the long-wave infrared range. Measurements are performed using both nanosecond and picosecond C O 2 laser pulses providing intensities up to 100 M W / c m 2 and 5 G W / c m 2 , respectively. Nonlinear absorption coefficients in optical quality n -Ge are found to be the same for both pulse durations. The nonlinear absorption coefficient of these materials scales inverse proportionally to their bandgap energies, indicating increased photoionization in the smaller bandgap materials.