Optical parametric oscillators (OPOs) with broadband output in the mid-infrared are well suited for high resolution, high sensitivity multi-species infrared spectroscopy. Applications often require remote delivery, either over open-paths or via fiber delivery to inaccessible environments.
Here we explore a flexible, easy to use, high-resolution technique in a challenging, spectroscopically cluttered landscape containing both narrow line-like and broad continuum-like features.
Quantitative, high resolution, time-resolved, simultaneous measurement of water, methane, methanol and C2H7NO (MEA) concentrations are performed via fiber delivery of the OPO light. Detection limits, and the impact of the presence of one species on the others, are also explored.
Here we report for the first time nonlinear frequency conversion in OP-GaP layers grown by hydride vapor-phase epitaxy on OP-GaAs templates. Multi-grating 3-inch wafer design enabled discrete wavelength tuning via stepped gratings, continuous tuning via fan gratings, and bandwidth engineering via chirped gratings, with 14- 35.2-micron periods that propagated up to 300 microns in a 1.2-mm-thick layer before breakdown. Polished, AR-coated, 3-mm-long OPO crystals were fabricated and pumped at 1040 nm (5.5W, 100 MHz, 2.5 ps) with a Chromacity Yb-fiber laser, yielding output powers of 140, 90, and 60 mW at idler wavelengths of 5.6, 7.8, and 10.7 microns respectively
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