Diode pumped solid state laser (DPL) and debugging method therefor

Abstract

The invention discloses a diode pumped solid state laser (DPL) and a debugging method therefor. The diode pumped solid state laser comprises a semiconductor pumping source, a coupling system, laser crystals, a bi-color plano-convex cylindrical surface totally-reflecting mirror, reflecting laser, a polarizing film, a quarter-wave plate, a pockels cell, and a plano-concave cylindrical surface output mirror, wherein the semiconductor pumping source is used for outputting pumping light; the coupling system is used for transmitting and homogenizing the pumping light, and coupling the pumping light into the laser crystals; the laser crystals are used for providing gain; the bi-color plano-convex cylindrical surface totally-reflecting mirror is arranged between the coupling system and the laser crystals and used for transmitting the pumping light and reflecting laser; the polarizing film is used for polarizing the laser; the quarter-wave plate is used for rotating the polarization direction of the passed laser for 45 degrees; when the pockels cell is not applied with voltage, the pockels cell is equivalent to a plain film; when the pockels cell is applied with quarter-wave voltage, the pockels cell is equivalent to the quarter-wave plate; and the plano-concave cylindrical surface output mirror is used for outputting laser. According to the diode pumped solid state laser provided by the invention, the repetition frequency of the pumping light is improved, the pumping light interval is shortened, the power density of the pumping light is improved; and in addition, the diode pumped solid state laser is small in divergence angle, so that the ranging or imaging distance is improved, and the application range is expanded.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to an all-solid-state laser and a debugging method thereof. Background technique [0002] DPL (DiodePumpedsolidstateLaser, all-solid-state laser) without water cooling and high peak power has developed rapidly in the fields of medical and health care, space radar, and even military due to its small size, light weight, and high efficiency. The platform is becoming more and more extensive, and the requirements for laser beam quality and pulse width are becoming more and more stringent. [0003] According to the pumping method, non-water-cooled all-solid-state lasers can be divided into side-pumped and end-pumped types. The side pump has the characteristics of simple structure and high pump power, and can output high-energy laser. However, the roundness of the light output by a single rod is not high enough, so a pump mode with two rods connected in series appears, which effectively c...

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Problems solved by technology

There is no total reflection mirror, which is not conducive to compressing the divergence angle

There is also a vertical cavity surface emitting laser (VCSEL, VerticalCavitySurfaceEmittingLaser) as the end pump source. Because its emission spot is circular, it is easy to integrate into a large-area array, which can be directly focused on the crystal surface, and the rear mirror can be added. The output beam quality It is better, but it is not a single transverse mode, which is not conducive to the application of laser imaging, the pulse width is not narrow, and the peak power is less than 10MW

[0004] However, how to achieve a small divergence angle, good beam quality, and narrow pulse width without water-cooled all-solid-state and high peak power output is a technical problem that needs to be solved urgently.

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