A multi-functional laser device and output method based on a single-block dual 45°-mgo:ln multi-modulation mode

A laser device and control device technology, applied in the laser field, can solve the problems of damaging the working pulse stability, high coating level requirements, and cannot be poured out of the cavity, etc., and achieves the advantages of simple operation, high integration, and reduced half-wave voltage Effect

Active Publication Date: 2021-11-23
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, the pulse width tuning can also be realized by the stimulated Brillouin scattering (SBS) double-stage phase conjugate mirror, the technical solution disclosed in the "pulse width tunable YAG laser" of the patent number CN95212767.9, the solution Pulse width tuning is realized by moving the distance from the SBS dual-stage phase conjugate mirror. The scheme relies on the reflected amplified light to be emptied from the resonant cavity, so that the requirements for the coating level of the oscillation-level and amplifying-level laser rods and various optical components are required. Higher, otherwise it is easy to cause self-excitation; this scheme relies on 1 / 4 wave plate and polarizing prism to realize laser output. When working at high energy or high power, the laser depolarization of the oscillation stage and the amplification stage will be more serious, so that the amplified A considerable part of the light cannot be poured out of the cavity, which interferes with the oscillation level and destroys the stability of the working pulse

Method used

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  • A multi-functional laser device and output method based on a single-block dual 45°-mgo:ln multi-modulation mode
  • A multi-functional laser device and output method based on a single-block dual 45°-mgo:ln multi-modulation mode
  • A multi-functional laser device and output method based on a single-block dual 45°-mgo:ln multi-modulation mode

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Embodiment 1

[0059] Embodiment one: if figure 2 As shown, after the pump source 2 provides energy to the laser gain medium 3, unpolarized stimulated fluorescent radiation is generated. The electro-optic control device 14 always applies a transverse half-wave voltage (A bright) to the double 45°-MgO:LN crystal 4, which can separate the non-polarized stimulated fluorescence into s-polarized light. The s-polarized light is converted into p-polarized light by passing through the bulk-doped MgO:LN crystal with transverse half-wave voltage applied. The p-polarized light passes through the Brewster mirror and directly transmits the p-total mirror to realize optical path oscillation without pulsed laser output. When the half-wave voltage applied to the bulk doped MgO:LN crystal is removed, the s-polarized light is directly reflected by the Brewster mirror to the s-light output mirror, and the electro-optical cavity emptying pulse output of the s-polarized light is realized. At the same time, th...

Embodiment 2

[0060] Embodiment 2: cavity structure such as Figure 1a As shown, the difference is that the p-polarized light output of the 1064nm cavity emptying device is replaced by an acousto-optic modulation device (same as the s-polarized acousto-optic Q-switched resonant cavity device). The transverse half-wave voltage is continuously applied to the double 45°-MgO:LN crystal to realize two beams of synchronous orthogonally polarized pulsed light modulated by acousto-optic modulation.

[0061] In summary, the present invention discloses a multifunctional laser device based on a single-block double 45°-MgO:LN that realizes three different modulation modes. The laser is a compound cavity device, and its device sequence includes front cavity mirror, pump source, laser gain medium, double 45° doped magnesium oxide lithium niobate crystal (double 45°-MgO:LN), s-polarized light acousto-optic Q-switching device, non-polarized electro-optic Q-switching device, p-polarized optical cavity empty...

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Abstract

The invention relates to the field of a multi-modulation mode multifunctional laser device and an output method based on a monolithic double 45°-MgO:LN. The device includes: front cavity mirror, pump source, laser gain medium, double 45°‑MgO: LN crystal, acousto-optic crystal, first output mirror, second output mirror, first block doped MgO: LN Crystal, the second horizontal back-pressure electro-optic modulator, the first Brewster mirror, the s-light full reflection mirror with electric guide rail, the p-light output mirror, the first optical isolator switch, the electro-optic control device, the acousto-optic modulator , the second optical isolator switch, the p-light total reflection mirror with electric guide rail, the s-light output mirror, the electro-optic control device is connected with the double 45°-MgO: LN crystal, the second horizontal back pressure electro-optic modulator Connected to the first bulk doped MgO:LN crystal. The invention can realize switching among three modulation modes of high repetition frequency acousto-optic Q-switched pulse laser, high-power electro-optic Q-switch pulse laser and electro-optic cavity emptying with narrow pulse width and high peak power, and has high integration and easy operation.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to the field of a multi-modulation mode multi-functional laser device and an output method based on a monolithic double 45°-MgO:LN. Background technique [0002] Solid-state lasers have been widely used in various fields. Among them, acousto-optic Q-switched lasers are widely used in fields such as photoelectric countermeasures and laser ranging due to their high repetition rate and good repeatability; the peak power of electro-optic Q-switched lasers can reach megabytes. Watt level and the pulse width is about ten nanoseconds, so it is widely used in laser welding, laser drilling, laser cutting, laser marking and other fields; compared with electro-optic Q-switched lasers, the pulse width of cavity emptying electro-optic modulation can be The advantages of compression to a few nanoseconds and high stability have also been applied to the above fields; however, the above laser modulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/00H01S3/08H01S3/10H01S3/082
CPCH01S3/0085H01S3/08H01S3/082H01S3/10
Inventor 白冰李立高正欣张玉兵田凤军崔金辉
Owner HARBIN ENG UNIV
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