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提出了一种基于体布拉格光栅(VBG)和横向啁啾体布拉格光栅(TCVBG)组合的双光栅外腔半导体激光器,该外腔半导体激光器采用反射率15%的体光栅和反射率17%的啁啾体布拉格光栅作为反馈元件和模式选择元件,实现特定波长的选择和调谐,实验研究了外腔激光器的功率-电流特性、光谱特性和波长调谐特性。实验结果表明:双光栅外腔半导体激光器最大输出功率为1.96 W,斜率效率为0.94 W/A,外腔效率达到78%。输出光谱为双波长,一个波长为808.6 nm,另一个波长连续可调,通过改变横向啁啾体光栅的位置,该波长可从800 nm调谐至815 nm,可调范围达15 nm,在整个可调范围内两个波长的谱线宽度(FWHM)均小于0.3 nm。
A double grating external cavity semiconductor laser based on a combination of bulk Bragg grating (VBG) and lateral chirped volume Bragg grating (TCVBG) is proposed. The external cavity semiconductor laser uses a volume grating with reflectivity of 15% and a chirped The chirp Bragg grating is used as a feedback element and a mode selection element to realize the selection and tuning of specific wavelengths. The power-current characteristics, spectral characteristics and wavelength tuning characteristics of an external cavity laser are experimentally studied. The experimental results show that the maximum output power of double grating external cavity semiconductor laser is 1.96 W, the slope efficiency is 0.94 W / A and the efficiency of external cavity is 78%. The output spectrum is dual wavelength with one wavelength of 808.6 nm and the other wavelength continuously adjustable. The wavelength can be tuned from 800 nm to 815 nm with a tunable range of 15 nm by changing the position of the lateral chirped volume grating. The spectral widths (FWHM) for both wavelengths within the tuning range are less than 0.3 nm.