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Proceedings Paper

Transient Gratings In Wide Band Gap Semiconductors -Impurities And Optical Phonon Dynamics-
Author(s): P. J. Delfyett; R. Dorsinville; R. R. Alfano
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Paper Abstract

Picosecond degenerate and nondegenerate transient gratings in wide band gap crystals are reviewed. The concepts focus on how these transient gratings can be used as spectroscopic tools to investigate the dynamics of photogenerated electron-holes to impurities in ZnSe:Cu, and coherent optical phonons. The nondegenerate moving transient grating method is used to generate Raman spectra of LiNbO3 and CaCO3 spanning 2000 cm-1 in a single 30 ps. pulse. A new real time phonon dynamic technique using these gratings in conjunction with a streak camera is discussed. This technique is used to measure the dephasing of the coherent optical phonons in CaCO3 of 7.5 ps. and LiNbO3, with a temporal resolution of 2 ps.

Paper Details

Date Published: 3 August 1987
PDF: 8 pages
Proc. SPIE 0793, Ultrafast Laser Probe Phenomena in Bulk and Microstructure Semiconductors, (3 August 1987); doi: 10.1117/12.940875
Show Author Affiliations
P. J. Delfyett, City College of New York (United States)
R. Dorsinville, City College of New York (United States)
R. R. Alfano, City College of New York (United States)


Published in SPIE Proceedings Vol. 0793:
Ultrafast Laser Probe Phenomena in Bulk and Microstructure Semiconductors
Robert R. Alfano, Editor(s)

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