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):

Report Date:

1994-12-28

Pagination or Media Count:

62.0

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

Subject Categories:

  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE