PRECISION OF MULTIPLEX CARS TEMPERATURES USING BOTH SINGLE-MODE AND MULTIMODE PUMP LASERS

Authors
  1. Snelling, D.R.
  2. Smallwood, G.J.
  3. Sawchuk, R.A.
  4. Parameswaran, T.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);Roy Ball Associates Ltd, Ottawa ONT (CAN)
Abstract
The noise level in single-pulse resonant nitrogen CARS spectra is shown to decrese with increasing pump laser bandwidth. This is the reverse of the trend observed for nonresonant CARS spectra. The precision of single-pulse CARS temperature measurements is shown to be dramatically increased by performing a weighted fit of theoretical and experimental CARS spectra using the measured detector noise coefficients as weighting parameters. The inclusion of collisional narrowing and cross-coherence in the CARS theory calculations and their effect on best fit temperatures are discussed. These temperatures, measured in a flat-flame burner, are compared with those obtained by Na line-reversal.
Date of publication
15 Jun 1986
Number of Pages
12
Reprinted from
Applied Optics, vol 26, no 1, 1987, p 99-110
DSTKIM No
87-01020
CANDIS No
49863
Format(s):
Hardcopy;Originator's fiche received by DSIS

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