STUDY OF OPTICAL INTERACTIONS IN SOLIDS
Final technical rept. 1 Sep 1966-31 Aug 1968
CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS
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Multiphoton absorption in semiconductors was investigated with emphasis on the III-V compounds. It was shown that this mechanism can set an intrinsic upper limit to the power density transmittible through semiconductors. Laser action in a large volume of GaAs was excited by double-photon pumping using a Q-switched neodymium laser, yielding output power of the order of a megawattsq cm at 8365A at liquid nitrogen temperature. A new temperature anomaly of the threshold for stimulated Raman emission in liquid benzene was discovered and investigated. The first observation of infrared stimulated emission associated with optical phonons of a liquid was reported. This was seen at 5 micrometers from benzene. In addition, induced transparency by coherent optical phonons was observed. A new technique of frequency-modulated spectroscopy was developed which enables one to readily obtain the first or higher derivatives of any optical spectra.
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics