Optical parametric oscillator with fast switching and finely adjustable gain bands

Abstract

The invention relates to a finely adjustable optical parameter oscillator with rapid switching between gain spectrums. The finely adjustable optical parameter oscillator comprises a pumping source, apolarization controller, an optical coupler, a double refraction-type nonlinear medium, an output coupler, an output end and a feedback optical path composed of a fixed delay line and an adjustable delay line, wherein the pumping source, the polarization controller, the optical coupler, the double refraction-type nonlinear medium, the output coupler, the output end and the feedback optical path are connected in sequence, the polarization state of adjustable pump light achieves rapid switching between the SMI gain spectrum and the XPMI gain spectrum, and the output optical wavelength of the optical parameter oscillator is rapidly adjusted in a wide range. The electronic control polarization controller is utilized for realizing rapid polarization control, and then the output wave length of the optical parameter oscillator is rapidly adjusted; by adjusting the length of the optical parameter oscillator, the output wave length can be finely adjusted; feedback delay leads to the situation that the time domain width of feedback pulses is larger than that of pumping pulses under the effect of chromatic dispersion, and based on a chromatic dispersion filter effect, a quite-narrow output spectrum is realized; the feedback optical path improves the conversion efficiency of the optical parameter oscillator. An optical structure device can be adopted, and the finely adjustable optical parameter oscillator has the advantage of being miniaturized.

Description

technical field [0001] The invention relates to a laser technology, in particular to an optical parametric oscillator with fast switching of gain bands and fine adjustment. Background technique [0002] Optical parametric oscillator (OPO) is a kind of nonlinear optical device, which uses nonlinear medium as the working medium. The working medium is placed in the resonant cavity, and the parameter conversion process is generated under the action of the pump light, and the laser output with a wavelength different from that of the pump light is formed through the oscillation of the resonant cavity. The Optical Parametric Oscillator (OPO) is an important means to solve the problem that the output wavelength of the existing gain medium cannot completely cover all bands. Because of its compact structure, convenient use, high power, and wide wavelength coverage, it has been widely used in various scientific research field. [0003] At present, the optical parametric oscillator (O...

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Problems solved by technology

[0003] At present, the optical parametric oscillator (OPO) mainly adopts adjustment methods such as pump light source wavelength adjustment, nonlinear medium angle adjustment, and nonlinear medium temperature adjustment. The above methods have their own shortcomings: the adjustment of the pump light source wavelength can easily cause the laser to lose lock. A special laser is required; the angle adjustment structure of the nonlinear medium is complex and difficult to realize; the temperature adjustment of the nonlinear medium is difficult to achieve fine adjustment; their common disadvantage is that the wavelength change speed is slow, and jump adjustment cannot be achieved

The existing adjustment methods are generally adjusted within a certain gain band, such as SMI, XPMI. For some applications that require fast switching, the adjustment speed is not enough

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