785 nm grating-coupled external-cavity laser for shifted-excitation Raman difference spectroscopy

Wang, Fei, Lv, Xueqin, Liu, Guokun, Cui, Xiaobin, Lu, Miao

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Fei Wang, Xueqin Lv, Guokun Liu, Xiaobin Cui, Miao Lu 785 nm grating-coupled external-cavity laser for shifted-excitation Raman difference spectroscopy (Полупроводниковый лазер с длиной волны 785 нм с внешним резонатором и решёточным выводом для разностной рамановской спектроскопии со сдвинутым спектром возбуждения) [на англ. яз.] // Оптический журнал. 2017. Т. 84. № 2. С. 28–35.

Fei Wang, Xueqin Lv, Guokun Liu, Xiaobin Cui, Miao Lu 785 nm grating-coupled external-cavity laser for shifted-excitation Raman difference spectroscopy (Полупроводниковый лазер с длиной волны 785 нм с внешним резонатором и решёточным выводом для разностной рамановской спектроскопии со сдвинутым спектром возбуждения) [in English] // Opticheskii Zhurnal. 2017. V. 84. № 2. P. 28–35.

For citation (Journal of Optical Technology):

Fei Wang, Xueqin Lv, Guokun Liu, Xiaobin Cui, and Miao Lu, "785 nm grating-coupled external-cavity laser for shifted-excitation Raman difference spectroscopy," Journal of Optical Technology. 84(2), 89-94 (2017). https://doi.org/10.1364/JOT.84.000089

Abstract:

A 785 nm grating-coupled external-cavity (EC) laser was fabricated and applied as a light source for shifted-excitation Raman difference spectroscopy (SERDS) to extract Raman signal from the fluorescence background. A simple Littrow-type EC configuration with the grating lines parallel to the p–n junction was applied to narrow the linewidth of commercially available high-power broad-area laser diode. The characteristics of the EC laser, including wavelength tuning range, output power, and emission spectra, were investigated in detail. A wavelength tuning range of more than 6 nm was realized at an injection current of 900 mA by simply changing the grating rotation angle. The output power after Raman probe coupling exceeded 40 mW and the spectral linewidth was narrowed significantly down to less than 0.1 nm from 0.9 nm (the free-running width). Then, five shifted emission lines were used for the Raman measurement with the sesame oil as the target, whose Raman signal was overwhelmed in the fluorescence background. Due to the constraint relationship between the signal intensity and the spectral resolution, the best reproducibility of the Raman signal without fluorescence background was obtained when the excitation wavelength interval was fixed at around the linewidth of the Raman peak. In conclusion, the grating-coupled EC laser with flexible wavelength tunability, high output power, and narrow spectral linewidth was demonstrated to be an ideal light source for SERDS application.

Keywords:

grating-coupled external-cavity laser, Raman spectroscopy, fluorescence background, shifted excitation Raman difference spectroscopy (SERDS).

Acknowledgements:

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61306087 and 61574119), the Natural Science Foundation of Fujian Province of China (Grant Nos. 2013J05096 and 2015J05130), and Fundamental Research Funds for the Central Universities (No. 20720150084).

OCIS codes: 140.3550, 140.3600, 140.5960, 170.5660, 170.6280

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