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Laser-beam mode control device

A mode control, laser beam technology, applied in lasers, laser parts, optics, etc., can solve the problems of large light energy loss, high requirements for optical path adjustment, difficult implementation, etc., to achieve easy adjustment, uncomplicated optical path, and simple structure. Effect

Inactive Publication Date: 2008-12-10
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, coherent beam combining of multiple lasers or the combination of external cavity and grating, filter and other components are usually used to achieve the purpose of improving the beam quality. Many optical components are used, which is difficult to realize, and the input of multiple laser beams is difficult. The position also has strict requirements, see prior art [Opt.Lett., 2005, Vol.30(12), 1485-1487; Opt.Lett., 1993, Vol.18(18), 1520-1522], the above two The method of external cavity can coherently couple the output laser of the fiber array to improve the quality of the output beam, but there are many optical components used, multi-channel beam operation, and high requirements for optical path adjustment. The distance between each optical component and the distance between the input beams The distance also needs to be strictly controlled, and the stability of the whole system is not high, so it is difficult to realize. In addition, because the light beam passes through the surface of each component many times when going back and forth in the resonator, the light energy loss is relatively large.

Method used

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  • Laser-beam mode control device

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Effect test

Embodiment 1

[0015] Nd:YVO for a diode pump source 4 The solid-state laser realizes mode control, and the pump source used is a diode array laser of 810nm, Nd:YVO 4 The length of the crystal is 1mm, Nd:YVO 4 One end of the crystal is plated with a 1064nm high-reflection film and a 810nm high-transmitting two-color film as the input end of the pump light of the laser 1, and the other end is plated with a 1064nm wavelength laser semi-transparent film 21 as the output end of the laser, with a reflectivity of 15%. The plano-convex lens 2 we used has a diameter of 30mm and a focal length of 150mm. The convex surface is coated with a 1064nm antireflection coating. The small circular surface at the center of the plano-convex lens with a radius of 0.5mm is coated with a semi-transparent coating 21 with a reflectivity of 80% for 1064nm. It is ensured that only the low-order mode laser beam 4 oscillates in the composite cavity to obtain high-quality laser output 5. The area of ​​the small circular surfa...

Embodiment 2

[0017] To realize mode control for a fiber laser 1, the pump light source used is a diode array laser with a wavelength of 975nm, the fiber used is a D-shaped inner cladding, the long and short axis dimensions of the inner cladding are 450μm / 400μm, and the numerical aperture of the inner cladding NA=0.37 , Yb-doped core diameter is 30μm, core numerical aperture NA=0.16, fiber length 18.2m. A dichroic plate is placed at one end of the fiber as the pump light input end of the laser. The dichroic plate is highly transparent to 975nm and highly reflective to 1080nm. The other end of the fiber is ground and has a Fresnel reflectivity of 4% as the output end of the laser. The diameter of the plano-convex lens 2 we used is 30mm, the focal length is 30mm, the convex surface is coated with an antireflection coating of 1080nm, and the center of the plane is coated with a semi-transparent coating with a radius of 0.5mm, 1mm and 1.5mm with a reflectivity of 80% to 1080nm. . The working princi...

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Abstract

The laser-beam-mode controller comprises: a laser, a flat lens on output beam direction of laser whose convex surface is opposite to laser output side, an antireflection film on the convex surface of lens matched with work wavelength, and a semi-permeable film on lens center, wherein the distance between the lens flat surface and laser output end is the focal length. This invention improves system stability and beam quality with simple structure.

Description

Technical field [0001] The invention relates to a laser beam and a resonant cavity, in particular to a laser beam mode control device. Background technique [0002] With the current increasing requirements for laser beams in the fields of industry, military, and communications, it is required to increase the power of the laser beam while ensuring good beam quality. However, when the power of the laser is increased, the mode of the output beam increases, and the beam quality decreases. The mode control technology using the laser beam is an effective way to solve these high requirements, especially the external cavity mode control technology can obtain high-quality output. In the prior art, the coherent beam combination of multiple lasers or the combination of external cavities, gratings, filters and other elements are usually used to improve the beam quality. It is difficult to achieve the goal of using more optical elements. The position also has strict requirements, see the prio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35H01S3/00
Inventor 郑颖辉何兵曾志男
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI