Narrow-linewidth 2-micron laser device

A laser, narrow linewidth technology, used in lasers, laser parts, phonon exciters, etc., to achieve high beam quality, good stability, and improved stability.

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

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in narrowing the laser line width in the current 2 μm laser, thereby providing a laser that can realize high power and high beam quality 2 μm laser output

Method used

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Embodiment 1

[0019] refer to figure 1 , the 1.9 μm laser pump source 1 of this embodiment adopts a fiber laser doped with thulium ions, the maximum output power is 50 W, the numerical aperture of the fiber is 0.22, and the core diameter is 200 μm. The spot diameter is 360 μm, and the beam waist is located in the middle of the laser crystal. The holmium ion-doped laser crystal 3 is a Ho:YAG laser crystal with a holmium ion doping concentration of 0.7%, with a size of 3mm×3mm×50mm and a size of 3mm×3mm. The two end faces are optically polished and coated with 1.9-2.1μm anti-reflection film. The four sides are roughened and then wrapped with indium foil and fixed with a heat sink to take away the heat generated in the crystal by conduction cooling. Q switch 4 adopts Gucci's acousto-optic Q switch, the size of the sound hole is 6mm, the center frequency is 41MHz, the RF power is 50W, and the diffraction efficiency is >85% (for 2.1μm).

[0020] The first cavity mirror 5-01 is a plano-concave m...

Embodiment 2

[0022] see figure 2 , this embodiment is improved on the basis of Embodiment 1, and the difference from Embodiment 1 is mainly: the 1.9 μm laser pump source 1 adopts a solid-state laser device doped with thulium ions, and two laser crystals doped with holmium ions 3. The size is 3mm×3mm×30mm, the concentration of doped holmium ions is 1%, the reflectivity of the third cavity mirror 5-03 to the 2.1μm laser is R=50%, and the reflectivity of the feedback mirror 6 to the 2.1μm laser is R=55% .

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Abstract

The invention discloses a narrow-linewidth 2-micron laser device. The narrow-linewidth 2-micron laser device includes a 1.9-micron laser pumping source, an optical coupling system, a holmium ion doped laser crystal, a Q switch, a first cavity mirror, a second cavity mirror, a third cavity mirror and a feedback mirror; 1.9-micron-wavelength laser outputted by the 1.9-micron laser pumping source is shaped through the optical coupling system and then is used for the holmium ion doped laser crystal; and the holmium ion doped laser crystal, the first cavity mirror, the second cavity mirror, the third cavity mirror and the feedback mirror jointly form an active laser resonant cavity. With the narrow-linewidth 2-micron laser device adopted, a special etalon or grating is not needed to be used for narrowing linewidth, and therefore, intracavity loss of the laser can be reduced, and the stability of the laser can be improved. The narrow-linewidth 2-micron laser device of the invention can realize high-power, high-beam quality and narrow-linewidth 2-micron laser output, and has the advantages of simple and compact structure and high stability, and has a bright application prospect in the fields of military, spectroscopy, remote sensing etc..

Description

technical field [0001] The invention relates to the field of all solid-state lasers, in particular to an efficient and compact laser device with a narrow line width of 2 μm. Background technique [0002] Mid-infrared lasers in the 3-5 μm band of the atmospheric window have important applications in military, spectroscopy, remote sensing and other fields, among which 2 μm lasers are one of the main ways to obtain mid-infrared lasers through nonlinear optical frequency conversion. However, in this kind of nonlinear optical frequency conversion, there are strict requirements on the line width of 2 μm laser, and only a sufficiently narrow line width can achieve high conversion efficiency. [0003] At present, the two main methods for narrowing the laser linewidth in 2μm lasers are inserting etalons in the cavity and using Bragg gratings as cavity mirrors, but the former has the disadvantage of large insertion loss, while the latter is severely affected by vibration and expensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/105H01S3/094H01S3/081
Inventor 刘在洲郑建奎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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