Lath laser amplifier and laser output method thereof

Abstract

The invention discloses a lath laser amplifier and a laser output method thereof. The lath laser amplifier comprises a seed laser module, a pump module, a gain medium module and a dichroic-mirror module; the pump module, the dichroic-mirror module and the gain medium module are arranged side by side, and the seed laser module is arranged on one side of the modules arranged side by side; the lath laser amplifier further comprises a diffusion collimating module; the gain medium module comprises a laser crystal and two cooling heat sink blocks, the laser crystal is a doped laser crystal and is in adhesive-free bonding with two non-doped laser crystals, and the thickness of the laser crystal ranges from 0.5mm to 1.5mm. The bonded laser crystal of an ultra-thin lath structure is utilized as a gain medium of the laser amplifier, two-way amplification is achieved by adopting the diffusion collimating module, heat effect of the laser crystal is reduced, the surface damage threshold of the laser amplifier is increased, laser gain extraction efficiency is increased, and continuous or pulse laser amplification output high in output power and beam quality can be acquired.

Description

technical field [0001] The invention relates to the technical field of solid-state laser amplifiers, in particular to a slab laser amplifier and a laser output method thereof. Background technique [0002] Both the laser amplifier and the laser (oscillator) are based on the same physical process of "optical amplification by stimulated radiation", the only difference is that the laser amplifier has no resonant cavity. Laser amplifiers can obtain high output power (energy) and high beam quality laser beams; however, the two indicators of high output power and high beam quality are a contradictory process in the laser, and it is difficult to meet them at the same time. In the laser amplifier system, the seed laser beam with high beam quality and low output power is generally included as the input laser, and the input laser is then amplified by the laser amplifier to obtain a laser with high output power and high beam quality. output. [0003] In existing high-power laser ampl...

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Problems solved by technology

[0003] In existing high-power laser amplifier systems, the main problem is the thermal problem in the laser gain medium

[0004] In the existing slab laser amplifier system, since the thickness of the slab-shaped laser crystal is still relatively large, there is inevitably a temperature gradient during heat dissipation, thereby reducing the quality of the laser beam; directly coating the surface of the laser gain crystal, Therefore, the damage threshold of the laser crystal surface is limited; the input laser is a Z-shaped path inside the slab laser crystal, and its bending angle is generally large, and the utilization rate of the pump gain is low, so the heat dissipation of the laser crystal is poor, and the laser damage threshold is low. Low Pu gain utilization is still a problem with existing technologies

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