Chinese Optics Letters, 2018, 16 (7): 071402, Published Online: Jul. 19, 2018   

Narrow-wavelength-spread spectral combining laser with a reflector for a double pass with a single grating Download: 613次

Author Affiliations
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
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.

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[J]. Chinese Optics Letters, 2018, 16(7): 071402.

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