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Chin. Opt. Lett.
 Home  List of Issues    Issue 09 , Vol. 15 , 2017    10.3788/COL201715.091403

Narrow-spectral-span spectral beam combining with a nonparallel double-grating structure
Quan Zhou1;2, Changhe Zhou1, Na Yu1;2, Chunlong Wei1, Wei Jia1, and Yancong Lu1;2
1 [Shanghai Institute of Optics and Fine Mechanics], Chinese Academy of Sciences, Shanghai 201 800, China
2 [University of Chinese Academy of Sciences], Beijing 100049, China

Chin. Opt. Lett., 2017, 15(09): pp.091403

Topic:Lasers and laser optics
Keywords(OCIS Code): 140.2010  140.3290  140.3298  050.1950  140.3410  

We propose a nonparallel double-grating structure in a spectral-beam combining technique, where two gratings are placed nonparallel satisfying the Littrow mount in the focal region of the convergent lens. The most attractive advantage of this approach is that it will compress the spectral span into half of its original spectrum, which means the number of combined elements can be doubled in the gain range of diode lasers. Experimental results demonstrate that the CW output power of the combined beam is 30.9 W with a spectral span of 7.0 nm, compared with its original spectrum span of 13.6 nm, and the spectral beam combining efficiency is 70.5%. In consideration that a single grating could have a high efficiency of >97% in a bandwidth of over ten nanometers, the efficiency loss of the grating pair should be less than 6%, which is acceptable for most applications, so this method of using double gratings should be highly interesting for practical applications when a nearly doubled number of diode lasers could be combined into one single laser compared with the previous single-grating methods.

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:2017/8/2

Get Citation: Quan Zhou, Changhe Zhou, Na Yu, Chunlong Wei, Wei Jia, and Yancong Lu, "Narrow-spectral-span spectral beam combining with a nonparallel double-grating structure," Chin. Opt. Lett. 15(09), 091403(2017)

Note: This work was supported by the Shanghai Science and Technology Committee (Nos. 16DZ2290102 and 15JC1403500), the Chinese Academy of Sciences (No. QYZDJ-SSW-JSC014), and the National Natural Science Foundation of China (No. 61405216).


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