Chinese Optics Letters, Vol. 2, Issue 8, 486 (2004)
Frequency stabilization of diode laser to 1.637 μm based on the methane absorption line
Weiguang Ma*, Lei Dong, Wangbao Yin, Changyong Li, and Suotang Jia
- College of Physics and Electronics Engineering, Shanxi University, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Taiyuan 030006
The frequency of an external-cavity diode laser has been stabilized to 1.637 μm by using the reference of absorption lines of methane. The method can be applied to wavelength division multiplexed optical communication, fiber-optic sensing systems, as well as the high-sensitivity detection of methane. The derivative-like error signal yielded by frequency modulation and phase sensitivity detection technology is inputted into the PI feedback loop circuit in order to stabilize the frequency to the line center. After stabilization, the frequency fluctuation of diode laser is held within 5.6 MHz, and the root of Allan variance of error signal reaches a minimum of 1.66*10^(-10) for an average time of 10 s.