Acta Optica Sinica, Volume. 37, Issue 10, 1005001(2017)
Design and Optimization of Transmission Gratings for Spectral Beam Combining Technique
A sub-wavelength transmission grating is designed and fabricated, which is utilized for the realization of diode laser array spectral beam combining. Based on the strictly coupled wave theory, the grating duty ratio, ridge height and period are designed, the effect of different structural parameters on grating diffraction efficiency is simulated, and thus the optimization of the grating diffraction efficiency is realized. The theoretical calculations show that, for a 940 nm laser, the -1 order diffraction efficiency of the optimized grating can reach 92%. The experimental results show that the output power is 46.2 W and the beam quality is 3.9 mm·mrad after the laser array spectral beam combining.
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Junming Zhang, Xiaojie Wu, Xiaohui Ma, He Zhang, Yonggang Zou. Design and Optimization of Transmission Gratings for Spectral Beam Combining Technique[J]. Acta Optica Sinica, 2017, 37(10): 1005001
Category: Diffraction and Gratings
Received: Apr. 7, 2017
Accepted: --
Published Online: Sep. 7, 2018
The Author Email: Zhang He (zhanghe@cust.edu.cn)