Development of an injection-seeded, pulsed optical parametric generator for high-resolution combustion diagnostic spectroscopy
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An injection-seeded pulsed optical parametric generation (OPG) system for high-resolution spectroscopy and laser diagnostics measurements of reacting media was developed. A distributed feedback laser centered at 1535 nm was used for injection seeding the optical parametric generation (OPG). The generated frequency spectrum was analyzed by monitoring the solid etalon fringes at the signal wavelength around 461 nm and the by recording the absorption line shape at low-pressure acetylene using the 1535 nm idler radiation. The etalon fringes set an upper limit of 500 MHz for the frequency band width for the signal radiation. Analysis of the absorption spectrum of acetylene at near vacuum pressures showed that the frequency band width of the idler radiation is < 200 MHz. Smooth temporal line profiles of the generated beams confirmed the single-longitudinal mode operation of the system. A very stable output both in terms of time and shot-to-shot intensity was observed. An overall conversion efficiency of over 10% was attained. The OPG/optical parametric oscillator could be used as stable all solid state tunable laser source for many spectroscopic and diagnostics applications. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
