3.5-micron extreme-narrow linewidth laser output method

Abstract

The invention relates to a 3.5-micron extreme-narrow linewidth laser output method. 1.9-micron pumping light transmitted by a first pumping laser device (9) and a second pumping laser device (10) enters an isolation device, the pumping light transmitted through the isolation device enters a uni-doped Tm: YVO4 crystal (2) and is absorbed by the uni-doped Tm: YVO4 crystal (2), then 3.5-micron laseris produced, 2-micron obtained through total reflection conducted on the 3.5-micron laser by a second total reflection mirror (3) enters a graphene Bragg grating (4), and first compressed light is obtained through beam linewidth compression of the graphene Bragg grating (4). The first compressed light enters a quartz dispersing prism (5) performs second time of linewidth compression, compressed beams are output from an output coupling lens (6), a computer system (12) automatically adjusts parameters of the pumping lasers, optical grating and a prism till the performance of the output light ismatched with pre-stored simulation information, and accordingly laser output of picometer linewidth is obtained.

Description

technical field [0001] The invention relates to a laser output method with a 3.5-micron ultra-narrow line width, in particular to a laser output method with a pico-meter line width of 3.5 microns. Background technique [0002] Lasers in the 3-5μm band are widely used, involving military affairs, infrared remote sensing, medical treatment and optical communications, etc., especially the mid-to-far infrared laser output can be realized under the action of nonlinear conversion. At present, single-doped Tm lasers basically adopt a single-end pumping method, which reduces the uniformity of laser crystal absorption of pump light, leads to unbalanced heat distribution inside the crystal, and adversely affects the high-power operation of the laser. The width is wider, and the transmission attenuation in the atmosphere is more obvious, which cannot meet the needs of military and civilian use. [0003] In addition, the existing optical path adjustment technology is manual adjustment,...

AI Technical Summary

Problems solved by technology

At present, single-doped Tm lasers basically adopt a single-end pumping method, which reduces the uniformity of laser crystal absorption of pump light, leads to unbalanced heat distribution inside the crystal, and adversely affects the high-power operation of the laser. The width is wider, and the transmission attenuation in the atmosphere is more obvious, which cannot meet the needs of military and civilian use.

[0003] In addition, the existing optical path adjustment technology is manual adjustment, it is difficult to obtain laser output with ideal pulse width, and only a single component can be adjusted at a time during manual adjustment, and it is difficult to obtain laser output with ideal pulse width

Therefore, in long-term scientific research, optical path adjustment has not only become a technical problem, but also the biggest obstacle restricting theory and practice.

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