Mid-infrared fiber laser

Abstract

The invention relates to the technical field of laser, and in particular relates to a mid-infrared fiber laser. The laser comprises a preposed pumping system, a resonant cavity and an output system. The laser is characterized in that the resonant cavity comprises a gain system and an optical parametric oscillator system; the gain system comprises a fiber Bragg grating, a gain fiber and a passive fiber, which are connected with one another; the fiber Bragg grating is connected with the pumping system by fibers; the optical parametric oscillator system comprises a focusing lens group, a Brewster polaroid, a nonlinear optical crystal, a short wave pass filter and a long wave pass filter, which are arranged in sequence; the short wave pass filter is arranged in front of the nonlinear optical crystal; the long wave pass filter is arranged behind the nonlinear optical crystal; and the light beams output by the passive fiber enter into the optical parametric oscillator system through the focusing lens group, enter into the output system through the long wave pass filter and are output after being shaped. The mid-infrared fiber laser has the following beneficial effects: the output power of a mid-infrared laser is improved; and the mid-infrared fiber laser is firm and durable.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a mid-infrared fiber laser. Background technique [0002] Mid-infrared lasers are widely used in national defense (jamming / blinding infrared guidance and thermal imaging cameras), biochemical (gas molecule detection), medical (bone / dental applications, surgery, pathological examination) and semiconductor technology (monitoring of plasma etching) It has important applications, but due to the lack of high-efficiency gain media in the mid-infrared band, the main means of generating lasers are parametric oscillation and frequency doubling. However, there are different problems in several existing lasers: semiconductor lasers of indium arsenic antimony and lead salts have extremely low efficiency and can only produce microwatt-level output; parametric oscillation schemes of solid-state lasers are difficult to achieve high average output power due to heat dissipation problems; carbon di...

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Problems solved by technology

[0002] Mid-infrared lasers are widely used in national defense (jamming / blinding infrared guidance and thermal imaging cameras), biochemical (gas molecule detection), medical (bone / dental applications, surgery, pathological examination) and semiconductor technology (monitoring of plasma etching) It has important applications, but due to the lack of high-efficiency gain media in the mid-infrared band, the main means of generating lasers are parametric oscillation and frequency doubling

However, there are different problems in several existing lasers: semiconductor lasers of indium arsenic antimony and lead salts have extremely low efficiency and can only produce microwatt-level output; parametric oscillation schemes of solid-state lasers are difficult to achieve high average output power due to heat dissipation problems; carbon dioxide The frequency doubling efficiency of the laser is high, but it is not suitable for field or airborne use; the existing fiber laser parametric oscillation scheme requires a complex, expensive narrow spectral width, linearly polarized main laser oscillation power amplification (MOPA) fiber laser, and the parametric oscillation efficiency outside the cavity Low

Generally speaking, none of the existing mid-infrared lasers can obtain high-power stable mid-infrared laser

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