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2-micron laser device enabling linearly polarized output

A laser and linear polarization technology, applied in the field of 2μm laser devices, can solve problems such as difficult debugging and complex structure, and achieve the effects of reducing difficulty of debugging, reducing space volume, and convenient adjustment

Inactive Publication Date: 2015-03-11
NO 717 INST CHINA MARINE HEAVY IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of difficulty in debugging and complicated structure of the current Ho:YAG laser outputting linearly polarized light, thereby providing a Ho:YAG laser device with compact structure and convenient debugging

Method used

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  • 2-micron laser device enabling linearly polarized output
  • 2-micron laser device enabling linearly polarized output
  • 2-micron laser device enabling linearly polarized output

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Embodiment 1

[0020] refer to figure 1 As shown, the 1.9 μm laser pump source 1 in this embodiment selects a Tm:YLF solid-state laser, the output laser wavelength is within the absorption bandwidth of the Ho:YAG laser crystal 3, the maximum output power is 30W, the beam quality factor M2=1.2, the line The width is less than 3nm, and the center wavelength is 1908nm. The optical coupling system 2 used adopts two lenses with focal lengths of 30mm and 50mm respectively. The pump light passes through the coupling system 2 and is focused on the center of the Ho:YAG laser crystal 3. The spot size at the beam waist is 350μm, Ho:YAG laser crystal 3 uses Ho:YAG crystal with Ho ion doping concentration of 0.7 at.%, size is 3mm×3mm×35mm; refer to figure 2 As shown, the enlarged view of Ho:YAG laser crystal 3 and YAG crystal 4 together: the normal line is the normal line of the inclined plane where the Brewster angle cut by the crystal end face is located, and α is the Brewster angle cut by the crystal...

Embodiment 2

[0022] refer to image 3 As shown in the figure, this embodiment is improved on the basis of the first embodiment, and the main difference with the structure of the first embodiment is: in order to further improve the output power of 2 μm, two Ho:YAG laser crystals 3 are used in series, each Each Ho:YAG laser crystal 3 is pumped by a Tm:YLF laser, and the fourth cavity mirror 6-04 is added, so that the number of cavity mirrors is increased to four, and the curvature radius of the third cavity mirror 6-03 is increased to R= 1000mm, when the total pump power is 60 watts, the output power of the laser reaches 31.5 watts, and the degree of linear polarization is 97.5%.

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Abstract

The invention discloses a 2-micron laser device enabling linearly polarized output. The 2-micron laser device includes a 1.9-micron laser pumping source, an optical coupling system, a Ho:YAG laser crystal, a YAG crystal, an acousto-optic Q switch, a first cavity mirror, a second cavity mirror and a third cavity mirror; pump light generated by the 1.9-micron laser pumping source passes through the optical coupling system and then is injected into the Ho:YAG laser cryastal; one end of the Ho:YAG laser crystal has a cross section in the shape of a trapezoid; an included angle between the waist and the upper bottom edge of the trapezoid is a specific angle alpha, and therefore, when being refracted, laser of which the transmission direction is perpendicular to the other end surface of the Ho:YAG laser crystal satisfies Brewster conditions; and the Ho:YAG laser crystal, the first cavity mirror, the second cavity mirror and the third cavity mirror jointly form a 2-micron laser resonant cavity. The 2-micron laser device of the invention can realize high-beam quality, high-power and linearly polarized laser output, and has the advantages of simple structure and convenient adjustment.

Description

technical field [0001] The invention relates to the field of all-solid-state lasers, in particular to a 2 μm laser device with compact structure, convenient debugging and linear polarization output. Background technique [0002] The 2μm laser is located in the eye-safe band and the weak absorption band of the atmosphere, so it has good application prospects in the fields of lidar, environmental monitoring, and medical diagnosis. In addition, the mid-infrared laser in the 3-5 μm band of the atmospheric window can be obtained from the 2 μm laser after nonlinear optical transformation, which has important applications in infrared countermeasures, spectroscopy, remote sensing and other fields. [0003] At present, an important solution to achieve laser output in the 2μm band is to use a semiconductor laser to pump a Tm-doped solid-state or fiber laser to output a 1.9μm laser, and then pump a Ho-doped Ho:YAG solid-state laser with this laser to obtain a 2μm-band laser. This sche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/16H01S3/106H01S3/081
Inventor 郑建奎刘在洲孙峰耿安兵项能全李海速葛浩山周正
Owner NO 717 INST CHINA MARINE HEAVY IND GRP
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