Kuo Wen-Kai, Wu Pei-Yu, Lee Chang-Ching
Department of Electro-Optics Engineering, National Formosa University, 64 Wenhua Rd., Huwei, Yunlin 63208, Taiwan, Republic of China.
Rev Sci Instrum. 2010 May;81(5):053107. doi: 10.1063/1.3429950.
A Fabry-Pérot enhanced electro-optic sensing system that utilizes a drive-current-tuned wavelength laser diode is presented. An electro-optic prober made of LiNbO(3) crystal with an asymmetric Fabry-Pérot cavity is used in this system. To lock the wavelength of the laser diode at resonant condition, a closed-loop power control scheme is proposed. Experiment results show that the system can keep the electro-optic prober at high sensitivity for a long working time when the closed-loop control function is on. If this function is off, the sensitivity may be fluctuated and only one-third of the best level in the worst case.
