Multi-wavelength mid-infrared optical parametric oscillator based on crystal self-Raman effect

Abstract

The invention relates to a mid-infrared optical parametric oscillator which produces multi-wavelength laser outputs by use of the self-Raman effect and the optical parametric process of a crystal, and belongs to the technical field of multi-wavelength lasers. The oscillator comprises four parts of a pump light source, a resonant cavity, a nonlinear frequency-conversion crystal and a partial refractive index modulation system. According to the mid-infrared optical parametric oscillator, through utilization of the broadband tuning capability of the optical parametric oscillator and the feature that an intra-cavity oscillation optical power is relatively high, stable multi-order Raman lasers are produced by signal light in the resonant cavity by designing the structure and parameters of the resonant cavity; high efficiency frequency differences can be produced between the Raman lasers and the pump light source by methods such as carrying out partial modulation on the refractive index of the nonlinear crystal; and further the stable multi-wavelength laser outputs are obtained. According to the mid-infrared optical parametric oscillator, near-infrared signal light and mid-infrared laser outputs of multiple different wavelengths can be realized by one pump light source of a single wavelength; a complex wavelength selection device is unnecessarily imported or a specially polarized crystal is unnecessarily customized; and the mid-infrared optical parametric oscillator is simple in structure, easy in realization and stable and reliable in performance.

Description

technical field [0001] The invention relates to a mid-infrared optical parametric oscillator which utilizes the Raman effect of the crystal itself and the optical parameter process to generate multi-wavelength laser output, belongs to the category of multi-wavelength laser technology, and can be widely used in frequency combs, multi-wavelength lasers and nonlinear frequency conversion and other fields. Background technique [0002] Multi-wavelength lasers are widely used in laser communication, remote sensing and telemetry, scientific research and other fields, especially some multi-wavelength lasers (also called multi-peak lasers) with narrow wavelength intervals (less than tens of nanometers), which can form frequency Combs play an irreplaceable role in multispectral imaging and gas composition detection. People can generate multi-peak lasers in various ways such as multi-spectral beam combining, multi-grating cascade, multi-level Raman effect or multi-level Brillouin eff...

AI Technical Summary

Problems solved by technology

To achieve multi-wavelength output, it is usually 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 parametricoscillator[J].Optics Communications,2009,282(1):126-128), or need to use multiple different wavelengths The pump light source (Reference 3: Zhang Wei, Peng Yuefeng, Wei Xingbin, etc., a dual-band multi-wavelength infrared parametric oscillator, Chinese invention patent application publication date: 2015-02-18) is complex in process and limited in the use of the band, difficult to Achieve laser output with more wavelengths

Images