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

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2018,（7）
• 页码范围: 55-59
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201816.071402

摘要

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.