Accession Number:

ADA254709

Title:

Novel Nonlinear Laser Diagnostic Techniques

Descriptive Note:

Annual technical rept. 6 Jun 1991-31 May 1992

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA MOLECULAR PHYSICS LAB

Report Date:

1992-07-10

Pagination or Media Count:

28.0

Abstract:

Research on novel laser-based diagnostic techniques was performed in two areas 1 extension of laser-based diagnostics to shorter wavelengths for two-phonon detection of atomic ions and for other detection techniques requiring high powers in the vuv and 2 investigation of the feasibility of quantitative concentration, temperature, and velocity measurements using two-phonon-excited amplified spontaneous emission of atomic oxygen and hydrogen. For the first task, the two-photon-resonant difference-frequency mixing process was extended to higher powers and shorter wavelengths. This radiation was used to perform multiphoton spectroscopy at shorter wavelengths in the vuv, including two- phonon-excited fluorescence in neon at 133 nm. On the second task, laser-induced fluorescence measurements of atomic hydrogen in a variety of low-pressure flames were compared with simultaneous ASE observations. The bandwidth of H atom ASE at 1200 and 1800 K was measured. Simultaneous O atom ASE and LIF in an H2O2 low- pressure flame have been demonstrated, and a model to calculate the intensity variation for laser gain measurements on a diode probe laser for atomic oxygen was assembled.

Subject Categories:

  • Lasers and Masers
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE