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We demonstrated a compact, widely tunable, and monochromatic high-repetition-rate terahertz (THz) source based on difference frequency generation in a GaSe crystal. The dual-wavelength pump laser was a doubly resonant near-degenerate type-II periodically poled LiNbO3 (PPLN) optical parametric oscillator (OPO), intracavity pumped by a 1.064-μm Q-switched Nd:YVO4 laser operating at 25 kHz. The PPLN...
By stacking two GaP plates, we have improved the THz peak power from 433 W to 1.36 kW based on difference-frequency generation, corresponding to an enhancement by two orders of magnitude over the previous result.
A room-temperature broadly tunable mid-infrared laser system based on quasi-phase-matched (QPM) difference frequency generation (DFG) in a periodically poled LiNbO3(PPLN) crystal is developed. The continuous wave mid-infrared coherent radiation from 3.2 to 3.7 mum with a maximum output power of about 1 muW has been generated. Performance characteristics of the mid-infrared laser system has been carried...
We investigated methods for improvement of continuous-wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that...
We have demonstrated broadly tunable mid-infrared generation from 5 mum to12 mum by difference frequency generation pumped with an electronically-tuned-Ti:sapphire laser. Rapid- and random-access of wavelength is realized in the mid-infrared region.
Real time NH/sub 3/ detection under H/sub 2/O vapor mixture with mid-IR light source at 3/spl mu/m based on difference frequency generation (DFG) was demonstrated. High spectral resolution measurements of NH/sub 3/ avoiding interference of water are reported.
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