Multi-seed injection intracavity difference frequency realization of multi-wavelength mid-infrared optical parametric oscillator

Abstract

The invention relates to a multi-wavelength intermediate infrared optical parametric oscillator implemented by difference frequency in a multi-seed injection cavity, and belongs to the technical field of multi-length laser. A plurality of seed light with different wavelengths are injected into a stable optical fiber laser pumping optical parametric oscillator, stable strong signal light exists in an optical parametric oscillator cavity already, the injected multi-wavelength seed light cannot generate difference frequency with the signal light, thus, a plurality of intermediate infrared laser outputs with different wavelengths are generated; a complicated wavelength selection device or a specially-polarized crystal is not needed to introduce or customize, the signal light only exists in the cavity, difference frequency is performed between a multi-seed light source and the signal light to generate the multi-wavelength outputs, and the multi-wavelength intermediate infrared optical parametric oscillator is simple in structure and stable and reliable in performance, and is easy to implement; and parameters such as line width, wavelength, intensity and envelope of the seed light used in the invention are relatively independent, the multi-wavelength intermediate infrared optical parametric oscillator is high in expansibility, many laser outputs in different types can be achieved, and a plurality of laser wavelength generated are stable and controllable in number, intensity and frequency interval.

Description

technical field [0001] The invention relates to a multi-wavelength mid-infrared optical parametric oscillator realized by frequency difference in a multi-seed injection cavity, which belongs to the technical category of multi-wavelength lasers and can be widely used in the fields of frequency combs, multi-wavelength lasers, nonlinear frequency conversion and the like. Background technique [0002] Multi-wavelength lasers are widely used in the fields of laser communication, remote sensing and telemetry, and scientific research. People can generate multi-wavelength lasers by means of multi-spectral beam combining, multi-grating cascading, multi-level Raman effect or multi-level Brillouin effect. Peak laser, the working bands of these solutions are mostly concentrated in the near-infrared band, and it is difficult to achieve mid-infrared laser output, especially in the mid-infrared band of 3 to 5 microns. Since most materials have strong absorption in this band, the development...

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Problems solved by technology

[0008] Therefore, to achieve multi-wavelength output through optical parametric oscillator (OPO) technology, it is necessary to put multiple different crystals in the cavity to meet different phase matching conditions (reference 1: Zhang T, Yao J, Zhu X, et al. Widely tunable, high-repetition-rate, dual signal-wave optical parametric oscillator by using two periodically poled crystals[J]. Optics Communications, 2007, 272(1): 111-115), or generate different structures in one crystal (reference 2: Ji F, Lu R, Li B, et al. Mid-infrared tunable dual-wavelength generation based on a quasi-phase-matched optical parametric oscillator [J]. Optics Communications, 2009, 282(1): 126-128) , the process is complex and the use of the wavelength band is limited, it is difficult to achieve more wavelengths of laser output

Reference 3 uses a multi-wavelength pulsed laser as a pump light source (Reference 3: Zhang Wei, Peng Yuefeng, Wei Xingbin, etc., a dual-band multi-wavelength infrared optical parametric oscillator, Chinese invention patent application publication date: 2015-02-18) This scheme requires the design of nonlinear crystals to meet the phase matching conditions of multiple pairs of parametric light. The process is complex and the use of wavelength bands is limited, and it is difficult to achieve laser output with more wavelengths.

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