We present a simple modulation-free technique to stabilize a laser frequency to the Doppler-free spectra of an atomic vapor. Polarization spectroscopy with use of a balanced polarimeter allows us to obtain a background-free dispersion signal suitable for high-speed and robust frequency stabilization. We employed the method to the 5S<sub>1/2</sub><i>F</i> = 2 → 5P<sub>3/2</sub><i>F</i>′ = 3 transition of <sup>87</sup>Rb atoms. The achieved feedback bandwidth was approximately 100 kHz, and an efficient suppression of the frequency noise in a laboratory environment was attained.
© 2003 Optical Society of America
Yutaka Yoshikawa, Takeshi Umeki, Takuro Mukae, Yoshio Torii, and Takahiro Kuga, "Frequency Stabilization of a Laser Diode with Use of Light-Induced Birefringence in an Atomic Vapor," Appl. Opt. 42, 6645-6649 (2003)