Zhang Haiwei, Duan Liangcheng, Zhao Yan, Xue Lifang, Jiang Pengbo, Liu Jun, Bai Yangbo, Shi Wei, Yao Jianquan
Engineering Research Center of Optoelectronic Devices and Communication Technology (Ministry of Education), Tianjin Key Laboratory of Film Electronic and Communication Device, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin 300384, China.
Institute of Laser and Optoelectronics, Key Laboratory of Optoelectronics Information Science and Technology (Ministry of Education), School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China.
Sensors (Basel). 2020 Apr 29;20(9):2539. doi: 10.3390/s20092539.
An analytical model for analyzing multi-channel intracavity spectroscopy technology (ICST) is established based on rate equations of Er-doped fiber laser. With the consideration of the amplified spontaneous emission, how the mode competition influences the iterative process for a stable output is analyzed. From the perspective of iterative times, the sensitivity-enhanced mechanism of the ICST is explained. Moreover, the theoretical modeling is employed to analyze the role that the mode-competition effect plays in switching the sensing channel automatically. It is demonstrated that, owing to the mode-competition effect in the laser cavity, the modulation of the cavity loss can be used to tune the sensing channel automatically. Furthermore, our proposed theoretical modeling is verified using a multi-channel ICST sensing system. It is indicated that the calculated estimates agree well with those data from the experimental absorption spectra. The principle will play a significant role in realizing the multiplexing of ICST.
基于掺铒光纤激光器的速率方程，建立了一种用于分析多通道内腔光谱技术（ICST）的解析模型。考虑到放大自发辐射，分析了模式竞争如何影响稳定输出的迭代过程。从迭代次数的角度解释了ICST的灵敏度增强机制。此外，利用理论建模分析了模式竞争效应在自动切换传感通道中所起的作用。结果表明，由于激光腔内的模式竞争效应，腔损耗的调制可用于自动调谐传感通道。此外，我们提出的理论建模通过多通道ICST传感系统得到了验证。结果表明，计算估计值与实验吸收光谱数据吻合良好。该原理将在实现ICST的复用方面发挥重要作用。
