Abstract
We used weak filtered optical feedback to set the output frequency of a commercial single mode diode laser close to the peak of an atomic line filter passband. A Cs Faraday atomic line filter provided ultra-narrow optical feedback passbands near 852 nm. The locked laser power of 34 mW was nearly that of the unlocked laser. In-band laser operation was tolerant of laser diode current and temperature fluctuations and feedback path instabilities, important qualities in the design of matched filtered optical transceivers. We describe the feedback locked laser diode and present locked spectrum measurements. We show how fine tuning over a 100 MHz range is available by feedback mirror positioning.
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