High-resolution line-shape spectroscopy during a laser pulse based on Dual-Broad-Band-CARS interferometry

Journal Article · Mon Jul 31 00:00:00 EDT 2006 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2006V036N07ABEH013179· OSTI ID:21466548

Vereschagin, Konstantin A; Vereschagin, Alexey K; Smirnov, Valery V; Stelmakh, O M; Fabelinskii, V I ^[1]; Clauss, W; Klimenko, D N; Oschwald, M ^[2]

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1. A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
2. German Aerospace Research Centre, DLR, Hardthausen (Germany)

A high-resolution spectroscopic method is developed for recording Raman spectra of molecular transitions in transient objects during a laser pulse with a resolution of {approx}0.1 cm{sup -1}. The method is based on CARS spectroscopy using a Fabry-Perot interferometer for spectral analysis of the CARS signal and detecting a circular interferometric pattern on a two-dimensional multichannel photodetector. It is shown that the use of the Dual-Broad-Band-CARS configuration to obtain the CARS process provides the efficient averaging of the spectral-amplitude noise of the CARS signal generated by a laser pulse and, in combination with the angular integration of the two-dimensional interference pattern, considerably improves the quality of interferograms. The method was tested upon diagnostics of the transient oxygen-hydrogen flame where information on the shapes of spectral lines of the Q-branch of hydrogen molecules required for measuring temperature was simultaneously obtained and used. (special issue devoted to the 90th anniversary of a.m. prokhorov)

• OSTI ID: 21466548
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 36, Issue 7; Other Information: DOI: 10.1070/QE2006v036n07ABEH013179; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
FABRY-PEROT INTERFEROMETER
FLAMES
HYDROGEN
INTERFERENCE
INTERFEROMETRY
LASER SPECTROSCOPY
LASERS
MOLECULES
OXYGEN
PULSES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
RESOLUTION
SCATTERING AMPLITUDES
SIGNALS
TWO-DIMENSIONAL CALCULATIONS
AMPLITUDES
ELEMENTS
INTERFEROMETERS
MEASURING INSTRUMENTS
NONMETALS
SPECTRA
SPECTROSCOPY