Accession Number : ADA332831

Title :   Ultrashort Pulse Excitation of Dense Upconversion Media

Descriptive Note : Final rept. 1 Mar 96-30 Jun 97

Corporate Author : MICHIGAN UNIV ANN ARBOR DIV OF RESEARCH DEVELOPMENT AND ADMINISTRATION

Personal Author(s) : Rand, Stephen C.

PDF Url : ADA332831

Report Date : 10 NOV 1997

Pagination or Media Count : 82

Abstract : This project was initiated to identify conditions in dense upconversion media under which ultrashort pulses could lead to new applications. Four main results were obtained. First, a new channel for the generation of ultraviolet upconversion emission in Erbium-doped compounds was discovered. Second, an extremely promising imaging technique which relies on time-gated, ultrafast upconversion was demonstrated. Third, induced nonlinear response in dense upconversion materials was shown to be primarily dispersive in nature, even for resonant interactions, and we were able to explain how this apparently contradictory behavior arises. This revealed for the first time that cooperative nonlinearities could be useful in lossless, ultrafast applications. Fourth, a local mode of Yb in CsCdBr3 crystals was identified with properties which should permit coherent control of upconversion by ultrashort pulses.

Descriptors :   *SOLID STATE LASERS, *SHORT PULSES, *CONTINUOUS WAVE LASERS, CONVERSION, EXCITATION, RAMAN SPECTROSCOPY, PULSED LASERS, DOPING, PRASEODYMIUM, ERBIUM, ULTRAVIOLET SPECTRA.

Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE