Developments in the two-color, two-photon, Laser-Induced Polarization Spectroscopy (LIPS) of atomic hydrogen
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Two-color, two-photon, laser-induced polarization spectroscopic measurements of atomic hydrogen were carried out using a stable, narrow-band, all-solid-state, tunable optical parametric generator (OPG) system. The application of the new laser system to measure the H-atom concentration profiles in counter flow diffusion flames of CH4/O2 was presented. An optical parametric oscillator (OPO) version of the system was demonstrated by placing two flat cavity mirrors with 99% and 70% reflectivity at the signal wavelength around the two -beta barium borate (BBO) crystals. There was no evidence of significant broadening of the spectral line width with the OPO cavity; however, it increased the power output by at least an order of magnitude compared to the OPG system. The four -BBO crystal OPG system could generate 20 mJ/pulse of laser radiation at the signal wavelength. The OPG system had a spectra] limit width < 200 MHz. The pulse-to-pulse laser intensities of the output beams were very stable. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
