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Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating

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Abstract

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.

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DOI:10.3788/col201816.071402

所属栏目:Lasers and laser optics

基金项目: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).

收稿日期:2018-03-08

录用日期:2018-05-14

网络出版日期:2018-06-27

作者单位    点击查看

Na Yu:Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Changhe Zhou:Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Chunlong Wei:Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Wei Jia:Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Yunkai Lu:Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China

联系人作者:Changhe Zhou(chazhou@mail.shcnc.ac.cn)

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引用该论文

Na Yu, Changhe Zhou, Chunlong Wei, Wei Jia, Yunkai Lu, "Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating," Chinese Optics Letters 16(7), 071402 (2018)

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