Method and device for improving output characteristic of Nd:YAG passively-Q-switched laser

Abstract

The invention belongs to the field of lasers. A device for improving the output characteristic of an Nd:YAG passively-Q-switched laser comprises a semi-conductor laser body (1), a pump coupling device (2), a coupling input lens (3), an Nd:YAG crystal (4), a passively-Q-switched crystal (5), a coupling output lens (6) and an output laser (7). The device for improving the output characteristic of the Nd:YAG passively-Q-switched laser is characterized in that the Nd:YAG crystal (4) is an Nd:YAG crystal bar or strip in the [100] or [110] cut direction, the Nd:YAG crystal in the [110] cut direction is placed in the mode that the [010] direction or the [T10] direction of the Nd:YAG crystal is parallel to the polarization direction of pump light and the crystal axis of a Cr4+:YAG crystal respectively, and the Nd:YAG crystal in the [100] cut direction is placed in the mode that the [011] direction or the [01T] direction or the [0TT] or the [0T1] direction of the Nd:YAG crystal is parallel to the polarization direction of the pump light and the crystal axis of the Cr4+:YAG crystal. Due to the fact that the polarization direction of oscillating light accords with the direction of higher absorption of specially-orientated Nd:YAG crystal, the output power and the extinction ratio can be greatly improved.

Description

technical field [0001] The present invention relates to a Nd:YAG crystal with a special orientation (such as [100], [110] cutting direction rods or slabs) pumped by the end face of a semiconductor laser, and by properly selecting the orientation position of the Cr:YAG passively Q-switched crystal and The method for obtaining laser output with high output power and high extinction ratio by pumping the polarization direction belongs to the field of laser manufacturing. Background technique [0002] Compared with active Q-switched lasers, passive Q-switched lasers have the advantages of compact structure, low cost, etc., and can obtain high peak power output at the same time, and are widely used in laser ranging, laser marking, and laser micromachining. [0003] The polarization characteristics of the Nd:YAG passively Q-switched laser output laser are usually determined by the pump polarization direction and the orientation position of the Cr:YAG passively Q-switched crystal. B...

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Problems solved by technology

[0003] The polarization characteristics of the Nd:YAG passively Q-switched laser output laser are usually determined by the pump polarization direction and the orientation position of the Cr:YAG passively Q-switched crystal. By matching the pump polarization direction and the crystal axis direction of the Cr:YAG passively Q-switched crystal, A stable, high extinction ratio laser output can be obtained, but there is no research report on obtaining stable, high extinction ratio, and high output power by changing the cutting direction of Nd:YAG crystal

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