[1] [1] Jiang Huilin, Tong Shoufeng. The Technologies and System of Space Laser Communication[M]. Beijing: National Defense Industry Press, 2010: 9-21.

[2] [2] Liang J B, Gao X D, You D Y, et al.. Detection of seam offset based on molten pool characteristics during high-power fiber laser welding[J]. Advanced Materials Research, 2012, 549: 1064-1068

[3] [3] Liu Jiang, Liu Kun, Shi Hongxing, et al.. High-power all-fiber mid-infrared supercontinuum laser source[J]. Chinese J Lasers, 2014, 41(9): 0902004.

[4] [4] Yang Xiaodong, Hou Xinhua. Investigation on the output characteristics of LD end-pumped Cr4+:YAG passively Q-switched laser [J]. Acta Photonica Sinica, 2012, 41(10): 1145-1148.

[5] [5] Dai Qibiao, Yi Hongying, Tian Xueping, et al.. Experimental study on passively Q-switched laser with Yb:GdCOB crystal[J]. Chinese J Lasers, 2013, 40(8): 0802002.

[6] [6] Cao Zongying. Output Characteristic for Cr4+：YAG Passively Q-Switched Laser by LD Pumped[D]. Xi′an: Xi′an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 2008: 26-29.

[7] [7] Degnan J J. Theory of the optimally coupled Q-switched laser[J]. IEEE Journal of Quantum Electronics, 1989, 25(2): 214-220.

[8] [8] Xu Tao, Jin Guangyong, Yu Yongji, et al.. Study on the pulse interval of passively Q-switched laser pumped by diode laser pulse [J]. Laser & Optoelectronics Progress, 2012, 49(6): 061401.

[9] [9] Wang Zhimin, Xu Jianqiu, Chen Weibiao. High-power passively Q-switch ultra-thin slab lasers[J]. Chin Opt Lett, 2007, 5(S1): 36-38.

[10] [10] Zhang Huawei, Jia Honghui, Yin Hongwei, et al.. The analysis of L-PPM modulation for ultraviolet laser communication[J]. Optical Communication Technology, 2010, 34(5): 56-58.

[11] [11] Ren Xin, Li Hongzuo, Wang Yan, et al.. Effect for modulation rate of pulsed fiber laser on pulse position modulation[J]. Acta Optica Sinica, 2014, 34(7): 0706002.

[12] [12] Stevens M L, Boroson D M. A simple delay-line 4-PPM demodulator with near-optimum performance[J]. Opt Express, 2012, 20(5): 5270-5280.

[13] [13] A Kwiecień, P Gaj, P Stera. Two- pulses position modulation for synchronized wireless optical communications[J]. Computer Networks, 2013, 370: 252-257.

[14] [14] Fan Yangyu, Bai Bo, Huang Aiping, et al.. Pulse-position-width modulation scheme in wireless optical communication system[J]. Chinese J Lasers, 2008, 35(12): 1883-1887.