Analysis of picosecond mid-infrared pulses by two-photon absorption in germanium
- 15 March 1997
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 81 (6) , 2818-2821
- https://doi.org/10.1063/1.364308
Abstract
We report on the observation of two-photon absorption for the direct gap in intrinsic germanium at room temperature using two independently tunable picosecond, mid-infrared light pulses. The two-photon absorption coefficient is determined for different wavelengths, and carrier densities down to about 1013 cm−3 could be detected at a sample length of 700 μm. Two-photon absorption in germanium is demonstrated to be a versatile tool for zero-point determination in time resolved pump-probe investigations and permits a precise measure of the time resolution of the laser system.This publication has 12 references indexed in Scilit:
- Femtosecond kinetics of photoexcited carriers in germaniumPhysical Review B, 1994
- Measurement of the anisotropy of two-photon absorption coefficients in zincblende semiconductorsIEEE Journal of Quantum Electronics, 1994
- Free-electron laser studies of direct and indirect two-photon absorption in germaniumPhysical Review Letters, 1993
- Nondegenerate two-photon absorption in zinc blende semiconductorsJournal of the Optical Society of America B, 1992
- Scaling rules for multiphoton interband absorption in semiconductorsJournal of the Optical Society of America B, 1984
- Two-photon absorption in Ge: Band effectsPhysical Review B, 1980
- Two-photon absorption in indium antimonide and germaniumJournal of Physics C: Solid State Physics, 1976
- Nonlinear Loss in Ge in the 25–4-μm RangeApplied Optics, 1973
- Two-Photon Excitation in Ca:Physical Review Letters, 1961
- Über Elementarakte mit zwei QuantensprüngenAnnalen der Physik, 1931