Accession Number : ADA291177

Title :   Semiconductor Film Cherenkov Lasers.

Descriptive Note : Final progress rept. 1 Jun 91-31 May 94,

Corporate Author : DARTMOUTH COLL HANOVER NH DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Walsh, John E.

PDF Url : ADA291177

Report Date : 28 DEC 1994

Pagination or Media Count : 62

Abstract : The technical achievements for the project 'Semiconductor Film Cherenkov Lasers' are summarized. Described in the fourteen appendices are the operation of a sapphire Cherenkov laser and various grating-coupled oscillators. These coherent radiation sources were operated over the spectral range extending from 3 mm down to 400 micrometers. The utility of various types of open, multi-grating resonators and mode-locked operation were also demonstrated. In addition to these experiments, which were carried out with a 10-100 kV pulse generator, a low-energy (3-3.6 MeV) Van de Graaff generator and a low-energy RF linac (2.8 MeV) were used to investigate the properties of continuum incoherent Smith-Purcell radiation. It was shown that levels of intensity comparable to the infrared beam lines on a synchrotron could be obtained and thus that grating-coupled sources are potentially an important new source for Fourier transform spectroscopy. Finally, a scanning electron microscope was adapted for investigating mu-electron-beam-driven far-infrared sources. At the close of the project, spontaneous emission over the 288-800 micrometers band had been observed. Intensity levels were in accord with expectations based on theory. One or more of the Appendices address these topics in detail. jg

Descriptors :   *SEMICONDUCTOR LASERS, *MODE LOCKED LASERS, FOURIER TRANSFORMATION, EMISSION, SOURCES, ELECTRON MICROSCOPES, ELECTRONIC SCANNERS, INTENSITY, FILMS, COHERENT RADIATION, SPECTRA, LOW ENERGY, OPERATION, LEVEL(QUANTITY), GENERATORS, RADIOFREQUENCY, VAN DE GRAAFF GENERATORS, FOURIER SPECTROSCOPY, SYNCHROTRONS, LINEAR ACCELERATORS.

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE