Double-end-surface pumping optical parametric oscillator

Abstract

The invention, which belongs to the technical field of optical parametric oscillator, provides a double-end-surface pumping optical parametric oscillator comprising a laser pumping source and the like. The optical parametric oscillator is characterized in that a beam splitter is arranged in rear of the laser pumping source and splits pump light into two light paths; the two paths of light beams are transmitted into a resonant cavity through respective light paths front the front side and the rear side of the resonant cavity, thereby forming a double-end-surface pumping optical parametric oscillator. Generated parametric light is outputted from a light resonant cavity of an output terminal. According to the invention, with the dual-end pumping way, a problem that the laser pump power is limited due to a low crystal destruction threshold during the single-end pump process can be solved; and the heat effect of the optical parametric oscillator can be reduced. Moreover, on the basis of the reasonable design of the resonant cavity, the good cavity model matching is realized, thereby obtaining the high-power high-light-beam-quality optical parametric laser output.

Description

technical field [0001] The invention relates to an optical parametric oscillator (OPO), in particular to a double-end surface pumped optical parametric oscillator. technical background [0002] The optical parametric oscillator refers to placing a nonlinear crystal in a resonant cavity, and a beam of pump light ω 3 is incident into a nonlinear crystal, producing two new beams of light ω 1 and ω 2 , and satisfy ω 3 = ω 1 +ω 2 . The output of an optical parametric oscillator has high monochromaticity and directivity, and it is one of the important means to change coherent radiation with fixed frequency into tunable coherent radiation and extend the wavelength of laser output. Different from the output laser wavelength of the laser oscillator is determined by the corresponding atomic transition, the output wavelength of the optical parametric oscillator is determined by the spectrum, spatial distribution, and phase matching conditions of the pump light, which can be tuned...

AI Technical Summary

Problems solved by technology

Same as the single-end pumped laser oscillator, since the thermal stress produced by the thermal effect in the crystal cannot exceed the fracture stress of the nonlinear crystal, the pump power per unit area of ​​the nonlinear crystal cannot be very high, and finally The obtained output power is relatively small, so that the optical parametric oscillator is subject to certain restrictions in practical applications

Since the length of the nonlinear crystal is affected by the walk-off effect, in order to obtain high-power laser output, there are also methods of using multiple nonlinear crystals, such as: "Nanosecond Pulse Optical Parametric Oscillator with Walk-Off Compensation Structure" (Infrared and Laser Engineering, 3149-3253, Vol.41, No.12(2012)), this method of increasing the number of nonlinear crystals to reduce the pump power per unit area of ​​the laser crystal not only increases the cost of equipment, Moreover, the laser is more complicated and difficult to adjust.

Images