Abstract

We propose a nonparallel double-grating structure in a spectral-beam combining technique, where two gratings are placed nonparallel satisfying the Littrow mount in the focal region of the convergent lens. The most attractive advantage of this approach is that it will compress the spectral span into half of its original spectrum, which means the number of combined elements can be doubled in the gain range of diode lasers. Experimental results demonstrate that the CW output power of the combined beam is 30.9 W with a spectral span of 7.0 nm, compared with its original spectrum span of 13.6 nm, and the spectral beam combining efficiency is 70.5%. In consideration that a single grating could have a high efficiency of >97% in a bandwidth of over ten nanometers, the efficiency loss of the grating pair should be less than 6%, which is acceptable for most applications, so this method of using double gratings should be highly interesting for practical applications when a nearly doubled number of diode lasers could be combined into one single laser compared with the previous single-grating methods.

© 2017 Chinese Laser Press

Narrow linewidth operation of a spectral beam combined diode laser bar

Zhanda Zhu, Menghua Jiang, Siqi Cheng, Yongling Hui, Hong Lei, and Qiang Li
Appl. Opt. 55(12) 3294-3296 (2016)

Spectral beam combining of diode lasers extended into the non-SBC direction

Jun Zhang, Hangyu Peng, Jiye Zhang, Jingbo Wang, Jinliang Han, Yuxin Lei, Li Qin, and Lijun Wang
Opt. Express 30(19) 33733-33738 (2022)

CW 50W/M² = 10.9 diode laser source by spectral beam combining based on a transmission grating

Jun Zhang, Hangyu Peng, Xihong Fu, Yun Liu, Li Qin, Guoqing Miao, and Lijun Wang
Opt. Express 21(3) 3627-3632 (2013)

Going beyond the beam quality limit of spectral beam combining of diode lasers in a V-shaped external cavity

Yufei Zhao, Fangyuan Sun, Cunzhu Tong, Shili Shu, Guanyu Hou, Huanyu Lu, Xin Zhang, Lijie Wang, Sicong Tian, and Lijun Wang
Opt. Express 26(11) 14058-14065 (2018)

High beam quality in two directions and high efficiency output of a diode laser array by spectral-beam-combining

Zhanda Zhu, Long Gou, Menghua Jiang, Yongling Hui, Hong Lei, and Qiang Li
Opt. Express 22(15) 17804-17809 (2014)