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Opt Lett. 2005 Dec 15;30(24):3317-9.

Locking lasers with large FM noise to high-Q cavities.

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Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA.


We demonstrate that a laser can be directly locked to a cavity when the laser linewidth is much greater than the cavity linewidth. We lock an external-cavity diode laser with more than 1 MHz of added frequency noise to a 3.5 kHz wide cavity resonance. Our analog servo acquires lock even though the laser frequency sweeps through the cavity resonance in less than the cavity buildup time. Our theoretical analysis fully describes our measurements and explains why lock can be acquired.

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