Note: Demonstration of an external-cavity diode laser system immune to current and temperature fluctuations

We demonstrate an external-cavity laser system using an anti-reflection coated laser diode as gain medium with about 60nm fluorescence spectrum, and a Rb Faraday anomalous dispersion optical filter (FADOF) as frequency-selecting element with a transmission bandwidth of 1.3GHz. With \documentclass[12pt]{minimal}\begin{document}$\rm{6.4\%}$\end{document} 6.4 % optical feedback, a single stable longitudinal mode is obtained with a linewidth of 69kHz. The wavelength of this laser is operating within the center of the highest transmission peak of FADOF over a diode current range from 55mA to 142mA and a diode temperature range from 15°C to 35°C, thus it is immune to the fluctuations of current and temperature.