Acta Photonica Sinica, Volume. 49, Issue 6, 0630003(2020)
Algorithm for Broadband Brillouin Spectra Analysis Based on Thomae's Function
As the seed-injected lasers widely used in Brillouin Lidar area are too expensive and huge, the algorithm for a broadband Brillouin signal should be developed, which could accelerate the application of compact and economic diode lasers. A variation of Thomae's function was found during the signal processing of broadband Brillouin lidar, and the property of this function-reaching minimum value at the Brillouin frequency shift was used to recover the original signal spectrum and the corresponding frequency shift from a 1:1 superposition of pump light and Brillouin light spectra. Experiments using test data show nearly 100% accuracies for ideal cases; but for non-ideal cases, only when the noise level is less than -30 dB and the ratio of pump light to Brillouin light is less than 1.05 can this algorithm obtain accurate result.
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Xu-sheng XIA, Xiang-long CAI, Zhong-hui LI, Chen-cheng SHEN, Wan-fa LIU, Yu-qi JIN, Feng-ting SANG, Jing-wei GUO. Algorithm for Broadband Brillouin Spectra Analysis Based on Thomae's Function[J]. Acta Photonica Sinica, 2020, 49(6): 0630003
Category: Spectroscopy
Received: Jan. 28, 2020
Accepted: Apr. 1, 2020
Published Online: Nov. 26, 2020
The Author Email: GUO Jing-wei (jingweiguo@dicp.ac.cn)