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Chin. Opt. Lett.
 Home  List of Issues    Issue 07 , Vol. 16 , 2018    10.3788/COL201816.071402

Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating
Na Yu1;2, Changhe Zhou1, Chunlong Wei1, Wei Jia1, and Yunkai Lu1;2
1 [Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences], Shanghai 201800, China
2 [University of Chinese Academy of Sciences], Beijing 100049, China

Chin. Opt. Lett., 2018, 16(07): pp.071402

Topic:Lasers and laser optics
Keywords(OCIS Code): 140.2010  140.3290  140.3298  140.3410  

We proposed a novel wavelength-spread compression technique for spectral beam combining of a diode laser array. A reflector, which is parallel to the grating, is introduced to achieve a double pass with a single grating. This facilitated the reduction of the wavelength spread by half and doubled the number of combined elements in the gain range of the diode laser. We achieved a power of 26.1 W under continuous wave operation using a 19 element single bar with a wavelength spread of 6.3 nm, which is nearly half of the original wavelength spread of 14.2 nm, demonstrating the double-compressed spectrum capability of this structure. The spectral beam combining efficiency was 63.7%. The grating efficiency and reflector reflectance were both over 95%; hence, the efficiency loss of the double-pass grating with a reflector is acceptable. In contrast to double-grating methods, the proposed method introduces a reflector that efficiently uses the single grating and shows significant potential for a more efficient spectral beam combining of diode laser arrays.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Posted online:2018/6/27

Get Citation: Na Yu, Changhe Zhou, Chunlong Wei, Wei Jia, and Yunkai Lu, "Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating," Chin. Opt. Lett. 16(07), 071402(2018)

Note: The authors acknowledge the support of the Shanghai Science and Technology Committee (Nos. 15JC1403500 and 16DZ2290102) and the Chinese Academy of Sciences (No. QYZDJ-SSW-JSC014).


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