1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China 2. Department of Physics, Changshu College, Changshu 215500, China 3. Graduate School of Chinese Academy of Sciences，Beijing 100039, China
Abstract：Charge-coupled device (CCD) has been widely used in spectral detection and spectral imaging fields, which has a number of benefits: broad spectral range response, low detection limit, wide dynamic range, minimal dark current and readout noise as well as the abilities of signal integration, simultaneous multichannel detection, and real-time detection. The combination of a traditional one meter grating spectrograph and a science charge-coupled device (CCD) led to a real-time grating spectrograph for laser spectrum detection developed in this paper. Based on the new grating spectrograph, the spectral characteristic of frequency-doubling of a broad band double-cladding fiber laser in polarized lithium niobate (PPLN) has been investigated. Dynamic spectrum of the second harmonic with varying temperature of PPLN has been observed and analyzed in detail.
[1] Asmstrong J A, Bloembergen N, Ducuing J et al. Phys. Rev., 1962, 127: 1918. [2] Yamada M, Nada N, Saitoh M et al. Applied Physics Letters, 1993, 62(5): 435. [3] ZHANG Chao，ZHU Yong-yun，ZHU Shi-ning et al(张 超，朱永元，祝世宁等). Physics(物理)，2002, 31(2): 75. [4] ZHANG Zhan-xia，LIU Hong-tao，HE Jia-yao(张展霞，刘洪涛，何家耀). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2000, 20(2): 160. [5] ZHU Xiao-zheng，ZHOU Jun，LOU Qi-hong et al(朱晓峥，周 军，楼祺洪等). Chinese Journal of Lasers(中国激光), 已录用. [6] Batchko Ｒ G, Shur V Y, Fejer M M et al. Applied Physics Letters, 1999, 76(12): 1673. [7] SONG Mei, XUE Ting, YU Jian et al(桑 梅，薛 挺，于 建等). Journal of Optoelectronics and Laser(光电子·激光), 2002, 13(4): 343. [8] Guskov S A, Popov S, Chernikov S V et al. Electronics Letter,1998, 34(34): 1419.
