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Design method and device of two-dimensional body holographic grating laser

A volume holographic grating and laser technology, which is applied in lasers, laser parts, phonon exciters, etc., can solve the problems of laser power increase and beam quality nonlinear decline, and achieve simple structure and keep the fundamental transverse mode unchanged Effect

Active Publication Date: 2019-01-15
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of increasing the power of the laser and decreasing the nonlinear beam quality, and propose a design method and device for a two-dimensional volume holographic grating laser, so that the lateral distribution of the laser output is controlled by the two-dimensional grating characteristics, which can effectively Control of laser beam quality independent of pump power

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  • Design method and device of two-dimensional body holographic grating laser
  • Design method and device of two-dimensional body holographic grating laser
  • Design method and device of two-dimensional body holographic grating laser

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Embodiment 1A

[0044] figure 2 It is a horizontal cross-sectional schematic diagram of a volume holographic grating laser. In the X-Z horizontal section, the laser includes a laser resonant cavity 28 , a laser medium 2 , and a semiconductor laser pump source 8 . The semiconductor laser pumping source 8 vertically saturates and pumps the laser medium 2 sideways, and the pumping direction 10 of the pumping source 8 in the horizontal plane is perpendicular to the optical axis 52 of the laser. The laser resonant cavity 28 is a non-parallel planar cavity, including a high reflection mirror 30 and an output mirror 32 . A cuboid-shaped slab laser medium 2 is arranged in the laser resonator 28 , and its longitudinal length 4 along the optical axis 52 is smaller than its transverse length. The doping concentration of the laser medium 2 is between 0.2 at.% and 0.6 at.%. The two oscillating laser light-transmitting surfaces of the laser medium 2 are cooled with flowing coolant. The temperature gra...

Embodiment 1B

[0047] image 3 A schematic diagram of a vertical cross-section of a volume holographic grating laser. In the Y-Z vertical section, the laser and the structure in the horizontal section figure 2 basically the same.

[0048] The laser includes a laser resonator 28 , a laser medium 2 , and a semiconductor laser pump source 8 . The pumping direction 10 of the pumping source 8 in the vertical section is perpendicular to the inward plane of the paper, that is, the vertical optical axis 52 . The saturated pumping region 12 on the pumping surface and inside of the laser medium 2 is the same as the longitudinal length 4 of the laser medium 2 in the longitudinal direction, and the minimum width 14 of the saturated pumping region 12 in the vertical direction is 0.4 mm. The laser resonant cavity 28 uses two plane mirrors, including a high reflection mirror 30 and an output mirror 32, and the initial state is a parallel plane cavity. A cuboid-shaped slab laser medium 2 is arranged in...

Embodiment 1C

[0051] Such as figure 2 and image 3 As shown, when the volume holographic grating exists in the horizontal section and the vertical section at the same time, a two-dimensional volume holographic grating solid-state laser is formed.

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Abstract

The invention provides a design method and a device for a two-dimensional body holographic grating solid-state laser. The main steps of the design method are to construct oscillating laser double-passsurface liquid-cooled semiconductor side-pumped slab module, including laser medium, pumping source and auxiliary glass sheet. A laser medium is arranged in a liquid cool cavity formed by an auxiliary glass sheet; The auxiliary glass sheet in the light passing direction has a small inclination angle with the laser medium. Using a low doping concentration laser medium; Saturation pumping on the side of laser medium; The influence of the side pump on the laser medium is represented by the equivalent opening angle of the water plane. Placing the slab module in a resonant cavity; The laser surface of the laser medium is cooled by a flowing coolant. The invention eliminates the drawback of adding too many mirrors to realize high gain using multi-loop device, and realizes degenerate four-wave mixing in one dimension or two dimensions at the same time in a linear cavity structure. The design device of the two-dimensional body holographic grating laser is simple and compact in structure, andhas the characteristics of linearly amplifying high power while maintaining the fundamental transverse mode unchanged.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers, in particular to a design method and device for a two-dimensional volume holographic grating laser. Background technique [0002] Generally, solid-state lasers can obtain laser output with better fundamental transverse mode or beam quality near the threshold or at lower pump power. But as the pump power increases, the beam quality degrades rapidly due to the thermo-optic effect. Therefore, overcoming the wavefront distortion caused by the thermo-optic effect is an important issue in the development of high-power lasers. In order to solve the thermo-optic effect of solid-state lasers, various types of lasers such as heat capacity, slab, sheet, and optical fiber have emerged. These measures have improved the beam quality to varying degrees, but there are still many problems. For example, the temperature rise effect of the laser medium of the heat capacity laser, the asymmetry of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10H01S3/105
CPCH01S3/10076H01S3/105
Inventor 王学军
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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