中国激光, 2005, 32 (5): 655, 网络出版: 2006-06-01
光学谐振腔增强碘分子调制转移光谱
Modulation Transfer Spectroscopy of I2 Enhanced by an External Optical Cavity
光谱学 调制转移光谱 腔内吸收增强 双频相位调制 spectroscopy modulation transfer spectroscopy cavity-enhanced absorption double-frequency phase modulation
摘要
提出了一种新的高灵敏激光光谱技术激光双频相位调制环形腔增强调制转移光谱技术。该技术采用单一晶体实现激光双频相位调制,在满足环形腔高精度锁定的同时,又结合了调制转移光谱技术的高灵敏度、高分辨率、无多普勒背景的优点和环形谐振腔增强技术在提高谱线信噪比方面的优势;由此,实验观察到127I2分子在532 nm波段高信噪比的超精细结构光谱。与传统调制转移光谱技术相比,该技术在提高微弱吸收光谱信号的探测灵敏度方面具有明显的优势,在高灵敏、高分辨光谱检测和激光稳频方面将有很好的应用前景。
Abstract
A novel high sensitive laser spectroscopy technique, double-frequency phase modulation ring-cavity enhanced modulation transfer spectroscopy, is presented. Using ring-cavity absorption enhancement and double-frequency phase modulation with one crystal, this technique combines the advantages of high sensitivity, high resolution, Doppler-free with modulation transfer spectroscopy and high signal to noise ratio with ring-cavity enhancement technique. The hyperfine spectrum of molecular 127I2 with high signal to noise ratio was observed at 532 nm. The experimental results show that this new spectroscopy technique enhances detection sensitivity greatly compared with traditional modulation transfer spectroscopy. It is promising for improvements of ultrasensitive spectroscopy and laser frequency stabilization.
陈艳萍, 蒋燕义, 毕志毅, 马龙生. 光学谐振腔增强碘分子调制转移光谱[J]. 中国激光, 2005, 32(5): 655. 陈艳萍, 蒋燕义, 毕志毅, 马龙生. Modulation Transfer Spectroscopy of I2 Enhanced by an External Optical Cavity[J]. Chinese Journal of Lasers, 2005, 32(5): 655.