Multi-wavelength intermediate infrared optical parametric oscillator implemented by difference frequency in multi-seed injection cavity

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(

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