Optical parametric oscillators (OPO) are based on nonlinear frequency conversion of laser radiation into two coherent light waves with lower frequencies, called the signal (s) and idler waves (id).
An optical parametric oscillator consists of three basic components, namely the pump source, the gain medium, and the feedback resonator (in detail you can see here: Springer Handbook of Lasers and Optics, chapter 11).
The choice of the pump laser depends together with the selection of the nonlinear material on the required wavelength range and time resolution for a given application.
Most OPOs, however, are pumped with nanosecond pulses from a Q-switched laser, thus easily reaching the required light intensities inside the nonlinear material.
Typical emissions are nanosecond pulses in the near or mid-infrared region with pulse energies up to a few millijoules.
The selection of the nonlinear material depends on the nonlinear parametric process, the experimental design and the properties of the pump source.
Fundamentally, the nonlinear crystal should be distinguished by a broad transparency range, a high optical-damage threshold and large effective nonlinearity. An important parameter is the birefringence of the crystal that has to be high enough to maintain phase matching. For stable operation of OPO systems with high energies the thermo-mechanical and thermo-optical stability of the crystal should be sufficient. Finally, the crystals should be available in appropriate dimensions and excellent optical homogeneity. The most appropriate crystals are: AgGaS2, AgGaSe2, HgGa2S4, ZnGeP2, CdSiP2, BaGa4Se7, also oxide crystals PPLN, PPKTP, PPKTA and PPRTA.
The design of the feedback resonator is strongly connected to the output characteristic of the pump source.
Three types of feedback resonators are distinguished, depending on the number of resonating waves: singly resonant OPO (SRO), doubly resonant OPO (DRO), pump-enhanced SRO (PESRO), triply resonant OPOs (TRO).
From 2009 Special technologies, Ltd. are working on the development of OPO's and difference frequency generators (DFG) and devices based on them.
In 2013 Special technologies, Ltd. developed coherent radiation source based on nanosecond OPO's with tunability in spectral range 2.5 — 10.8 μm.
Specialist of Special technologies, Ltd. have an experience in the development of parametric frequency conversion in a variety of nonlinear crystals, namely: PPLN, PPKTP, AgGaS2, AgGaSe2, HgGa2S4, LiGaS2, LiGaSe2, LiInSe2, BaGa4S7, BaGa4Se7.
Optical parametric oscillators are powerful devices for the efficient generation of widely tunable coherent light. The intense research in OPOs has resulted in reliable OPO systems, which are commercially available. The tunability and the high output power define the optical parametric oscillator as an attractive source in many applications including high-resolution spectroscopy, environmental monitoring, medical research, process control, remote sensing and precision frequency measurements.
Applications:
— spectroscopy, including photo-acoustic spectroscopy;
— gas analysis, including gas analysis for medicine (exhaled air of patients), environmental and industrial monitoring;
— study of the dispersion properties of materials;
— laser surgery;
— laboratory research.
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