Free-electron laser studies of direct and indirect two-photon absorption in germanium
- 28 June 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 70 (26) , 4146-4149
- https://doi.org/10.1103/physrevlett.70.4146
Abstract
We succeeded in observing the two-photon absorption of germanium for both the direct and the indirect gaps, using the Vanderbilt free-electron laser. The two-photon absorption for the indirect gap was found to be 3 orders of magnetude smaller than the direct gap. The indirect-gap threshold position indicates that the two-photon absorption is assisted by an LO phonon, providing a long-delayed positive test of the Bassani-Hassan predictions.Keywords
This publication has 10 references indexed in Scilit:
- Review of multiphoton absorption in crystalline solidsJournal of the Optical Society of America B, 1985
- 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
- Three-photon luminescence in CdSOptics Communications, 1974
- Two-photon absorption with exciton effect for degenerate valence bandsPhysical Review B, 1974
- Nonlinear Loss in Ge in the 25–4-μm RangeApplied Optics, 1973
- Indirect Two-Photon Transitions in Si at 1.06 μmPhysical Review Letters, 1973
- Phonon-assisted two-photon exciton transitions in semiconductorsIl Nuovo Cimento B (1971-1996), 1973
- Analysis of indirect two-photon interband transitions and of direct three-photon transitions in semiconductorsIl Nuovo Cimento B (1971-1996), 1972
- Theory of Two-Photon Spectroscopy in SolidsPhysical Review B, 1968