Efficient In-band Diode-pumped Q-switched Solid State Laser for Methane Detection
We propose to develop an efficient, tunable Q-switched SSL operating at a wavelength of 1651 nm with pulse energy>1 mJ at 2000 Hz repetition rate with in-band laser diode pumping. We will leverage initial work carried out during Phase I of this program to pursue two approaches: (i) a tunable injection-seeded Q-switched SSL, and (ii) a regenerative power amplifier. In Phase I, we investigated a variety of gallium garnet gain media?including comprehensive characterization of absorption and fluorescence spectra?and we have identified the most promising prospective crystals for 1651 nm emission. We have also demonstrated sufficient tunability to enable differential path LIDAR techniques for the detection of methane.
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