中国激光, 2015, 42 (12): 1202003, 网络出版: 2015-11-30   

宽调谐范围光栅外腔窄线宽405 nm 蓝紫光半导体激光器研究

Study on Broad Tuning Range and Narrow Line-Width 405 nm Blue-Violet Diode Laser with Grating External Cavity
作者单位
华中科技大学光学与电子信息学院华中科技大学武汉光电国家实验室, 湖北 武汉 430074
摘要
自由运行的半导体激光器通常为多纵模光谱输出,谱线宽度较大,不能满足拉曼散射等对光源线宽有要求的应用。为得到稳定输出的窄线宽激光,通过使用反射式全息光栅,有效地窄化了405 nm 波段激光二极管的谱线宽度。使用高分辨率单色仪检测了Littrow 布局下光栅外腔半导体激光器的输出光谱,并通过输出功率和光谱特性研究了光栅外腔半导体激光器的阈值和调谐特性。实验发现,通过使用2400 l/mm 和3600 l/mm 刻线密度的反射式全息光栅,激光二极管的阈值电流由30.0 mA 分别下降到19.7 mA 和21.3 mA,谱线宽度也从自由运行时的1 nm 左右下降到0.03 nm 以内,在标称的工作电流范围内得到了窄线宽激光输出,并且分别实现了5.45 nm 和5.33 nm 宽度的波长调谐。这一结果有利于推动蓝紫光激光二极管的光谱应用。
Abstract
Free-running diode lasers can not satisfy the demands of spectroscopy applications such as Raman scattering which requires narrow line-width. In order to obtain narrow line-width laser at 405 nm band, external cavity with reflective holographic gratings for blue-violet laser diode (LD) is studied. The spectra of the blue-violet LD with a grating external cavity in Littrow configuration are measured by a high resolution monochromator, and the characteristics of threshold and tuning property are investigated through its output power and spectra. It is found that the threshold current of LD is reduced from 30.0 mA to 19.7 mA or 21.3 mA when the groove density of the grating is 2400 l/mm or 3600 l/mm respectively, and the line-width is suppressed within 0.03 nm in the full scope of injection currents while the line-width of the free running LD is approximately 1nm. Furthermore, tuning ranges of 5.45 nm and 5.33 nm are achieved. These results is helpful for the spectroscopy applications of blue-violet LD.

李斌, 高俊, 赵俊, 余安澜, 王新兵, 左都罗. 宽调谐范围光栅外腔窄线宽405 nm 蓝紫光半导体激光器研究[J]. 中国激光, 2015, 42(12): 1202003. Li Bin, Gao Jun, Zhao Jun, Yu Anlan, Wang Xinbing, Zuo Duluo. Study on Broad Tuning Range and Narrow Line-Width 405 nm Blue-Violet Diode Laser with Grating External Cavity[J]. Chinese Journal of Lasers, 2015, 42(12): 1202003.

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