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Multi-path optical fiber laser coherent beam combination device and coherent beam combination method

A coherent bundle and multi-channel optical fiber technology, applied in the laser field, can solve the problems of high cost, poor beam quality, and difficulty in meeting the high power requirements of high-energy laser systems, and achieve simple structure and increased system complexity , Improve the effect of output power and brightness

Inactive Publication Date: 2008-04-09
AIR FORCE UNIV PLA
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  • Application Information

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Problems solved by technology

However, due to the limitations of physical mechanisms such as nonlinear effects of doped fibers, optical damage, and thermal damage, it is difficult for the output power of the above-mentioned single fiber laser to meet the high power requirements of high-energy laser systems.
It is difficult and expensive to increase the output power of a single laser significantly
At the same time, as the output power increases, a single fiber laser has defects such as poor beam quality

Method used

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  • Multi-path optical fiber laser coherent beam combination device and coherent beam combination method

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Embodiment 1

[0042] 2-way fiber laser coherent bundle embodiment

[0043] The resonant wavelength of the fiber grating is 1550nm, and its reflectivity is about 95%; a 1×2 fiber coupler with a splitting ratio of 50:50 is used; the doped fiber is an erbium-ytterbium co-doped large mode area double-clad fiber, and the lengths are respectively It is about 1m; the focal length of the lens is about 1.5cm; the pump sources work around the wavelength of 980nm, and the maximum output power of each pump source is about 20W; the output laser power of the two doped fibers under the excitation of pump light They are 5.6W and 6.2W respectively; due to the spectral selectivity of fiber gratings, the wavelengths of the output lasers from the two doped fibers are both 1550nm; 100%; adjust the polarization controller so that the polarization directions of the output lasers of the two doped fibers are the same (perpendicular to the paper); the reflectivity of the two mirrors is about 98% when the 1550nm ligh...

Embodiment 2

[0046] For example, to realize 4 laser beams, only need to use 1×4 fiber coupler, 4 doped fibers with basically the same length, and 4 pump sources with corresponding wavelengths (if the erbium-ytterbium co-doped fiber, the wavelength of the pump source should be at Near 980nm), 4 lenses, 4 dichroic mirrors and 4 reflectors, at the same time, 4 individual gratings should be recorded in the optical medium in advance, and the angle between the grating vectors is determined by the Bragg condition, so that 4 fiber lasers can be realized coherent bundles.

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Abstract

The invention discloses a multi-channel optical-fiber laser coherence beam combination device and a coherence beam combination method based on overlapped body grating. The device comprises an optical-fiber coupler, a doping double-clad optical-fiber, a lens, a dichroiscope, a reflector, a polarization controller, a reflector, an overlapped body grating and an output coupling mirror connected in sequence at one side of the optical-fiber grating. The method is able to realize the multi-channel optical-fiber laser coherence beam combination without complex phase detection and control to each beam. The phases of each beam realize interlocking by sharing a resonator composed of the output coupling mirror and the optical-fiber grating. Each beam realizes the coherent superposition in the near-field and far-field to significantly enhance the output power and the brightness of the optical-fiber laser through the overlapped body of grating. The invention features the simple structure and complex structure without increasing as the increase of the beam combination laser, and is able to be widely applied in the field needing the large power optical-fiber laser as the light source, thereby capable of gaining the large power, high beam quality as well as compact high-energy laser system.

Description

technical field [0001] The invention relates to a laser technology, in particular to a multi-channel fiber laser coherent beam combining device and a coherent beam combining method based on overlapping volume gratings. Background technique [0002] Developing a high-power, high-beam-quality, efficient, and compact high-energy laser system to meet the needs of various applications, especially military, is the long-term research goal of countries all over the world. Fiber lasers have the characteristics of high efficiency, compactness, good beam quality, good heat dissipation characteristics and high output power stability, and the flexibility of optical fibers enables them to flexibly adapt to different installation environments by bending without affecting the output of the beam. Therefore, the competitiveness of fiber lasers far exceeds other lasers, has a huge market, and has broad application prospects in industry, medicine and military. In the industrial and medical fie...

Claims

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Application Information

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IPC IPC(8): H01S3/23H01S3/067H01S3/08H01S3/10G02B6/02G02B6/26G02B27/09G02F1/35
Inventor 楚兴春赵尚弘占生宝石磊胥杰李勇军方绍强吴卓亮
Owner AIR FORCE UNIV PLA
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