4 March 2016 Spectral beam combining of multi-single emitters
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Abstract
Spectral beam combination expands the output power while keeps the beam quality of the combined beam almost the same as that of a single emitter. Spectral beam combination has been successfully achieved for high power fiber lasers, diode laser arrays and diode laser stacks. We have recently achieved the spectral beam combination of multiple single emitter diode lasers. Spatial beam combination and beam transformation are employed before beams from 25 single emitter diode lasers can be spectrally combined. An average output power about 220W, a spectral bandwidth less than 9 nm (95% energy), a beam quality similar to that of a single emitter and electro-optical conversion efficiency over 46% are achieved.

In this paper, Rigorous Coupled Wave analysis is used to numerically evaluate the influence of emitter width, emitter pitch and focal length of transform lens on diffraction efficiency of the grating and spectral bandwidth.

To assess the chance of catastrophic optical mirror damage (COMD), the optical power in the internal cavity of a free running emitter and the optical power in the grating external cavity of a wavelength locked emitter are theoretically analyzed.

Advantages and disadvantages of spectral beam combination are concluded.
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Baohua Wang, Baohua Wang, Weirong Guo, Weirong Guo, Zhijie Guo, Zhijie Guo, Dan Xu, Dan Xu, Jing Zhu, Jing Zhu, Qiang Zhang, Qiang Zhang, Thomas Yang, Thomas Yang, Xiaohua Chen, Xiaohua Chen, } "Spectral beam combining of multi-single emitters", Proc. SPIE 9733, High-Power Diode Laser Technology and Applications XIV, 97330F (4 March 2016); doi: 10.1117/12.2210834; https://doi.org/10.1117/12.2210834
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