Widely tunable LWIR parametric source based on pump wavelength tuning
Résumé
Long wave infrared (LWIR) coherent sources emitting between 8 and 12 µm can be used for standoff detection of many chemicals. Optical parametric sources are essential when peak power and wavelength tunability are both required. In particular, the nested cavity optical parametric oscillator (NesCOPO) based on orientationpatterned gallium arsenide (OP-GaAs) allows LWIR single longitudinal emission, by down conversion from 2 µm radiation. Using the recent development of a pulsed single longitudinal mode Tm:YAP laser tunable over 20 nm near 2 µm, we demonstrate broadband tuning over 830 nm in the LWIR with the NesCOPO architecture without tuning the non-linear crystal temperature. This result paves the way to fast, broadband wavelength tunable sources in the LWIR.
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