Sub-hertz frequency stabilization of a commercial diode laser
Abstract
We report ultra-stable locking of a commercially available extended cavity diode laser to a vibration-insensitive high finesse Fabry-Perot cavity. A servo bandwidth of 2 MHz is demonstrated. The absolute stability of the diode laser after locking is measured with a three-cornered-hat method. The resulting Allan deviation reaches a level of 2.95×10-15 at 1 s, corresponding to only 0.93 Hz linewidth, even without vibration isolation of the reference cavity.
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