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10 May 1996 Multiwavelength injection-seeded midinfrared optical parametric oscillator for DIAL
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We have constructed and fielded a multi-wavelength injection seeded mid-IR OPO source for DIAL. This OPO system was built for ground based remote sensing measurements of species with both broad (300 cm-1) and narrow absorption bandwidth (0.07 cm-1 FWHM). The OPO utilizes a single frequency tunable diode laser for the injection seeded signal wavelength in the region from 6400 to 6700 cm-1 and an angle phase-matched 5 cm LiNbO3 crystal to provide large tuning excursions on a slow time scale. The pump was a diode pumped Nd:YAG MOPA (9398 cm-1) running at 180 Hz. This pump source was repeatedly injection seeded with a different wavelength on each of three sequential shots forming a set of three pulses having wavelength separations on the order of 0.4 cm-1 at a three color set repetition rate of 60 Hz. This combination of OPO signal and pump source produced a set of three time staggered idler wavelengths separated by 0.4 cm-1 with the center wavelength tunable from 2700 to 3000 cm-1. This OPO system was used in field test experiments to detect the release of chemicals from a standoff distance of 3.3 Km. We present key OPO design criteria, performance data, and numerical simulations that agree with our observation of pump induced spectral impurities in the OPO output.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark S. Webb, Kenneth A. Stanion, David J. Deane, William M. Cook, William A. Neuman, and Stephan P. Velsko "Multiwavelength injection-seeded midinfrared optical parametric oscillator for DIAL", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996);

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