The combination of continuous-wave difference frequency generation based on quasi-phase-matched (QPM) gallium arsenide with cavity ring-down spectroscopy is explored for use in spectroscopic and chemical sensing applications. The advent of QPM materials based on orientation- patterned GaAs (OP-GaAs) offers a significant advantage over traditional ferroelectric QPM materials of extended wavelength coverage into the spectroscopically important 8 –12 µm region. In this work, the outputs from two tunable, external cavity diode lasers covering the 1.3 µm and 1.5 µm telecom bands were amplified then mixed in an orientation-patterned GaAs crystal, producing several microwatts of tunable radiation in the 7– 9 µm region. We also evaluate the use of a low-power DFG source for use in cavity ring-down spectroscopy.
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Bisson APB2006 | 583.32 KB |