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Multiplex H-2 coherent anti-Stokes Raman scattering thermometry with a modeless laser

Kaminski, CF; Ewart, P, "Multiplex H-2 coherent anti-Stokes Raman scattering thermometry with a modeless laser", APPLIED OPTICS 36:731-734(1997), DOI:10.1364/AO.36.000731, | pdf


Abstract

The use of a modeless laser as the Stokes source for multiplex coherent anti-Stokes Raman scattering in molecular hydrogen is reported. The elimination of noise associated with mode competition in conventional standing wave lasers is shown to result in reliable and accurate single-shot thermometry of H2 in a microwave-assisted diamond chemical vapor deposition plasma reactor. Single-shot temperatures are recorded with a precision of 7.3%. Possible improvements to this precision are discussed and applications of the technique for on-line process monitoring are briefly presented.