Abstract
We present a simple scheme for tuneable relative frequency stabilization of lasers. A highly sensitive and accurate frequency-to-voltage converter is used to derive an error signal from the beat note between two lasers. We analyze in detail detector noise and drift, modulation detection bandwidth, and cross-talk from power modulation. The results indicate that sub-kHz relative linewidth and a locking point drift on the order of 100 Hz for times scales of 1 h are achievable. The scheme can, therefore, be applied to situations where up to now only optical PLLs could provide sufficient accuracy and precision. To demonstrate its potential for high-resolution, high-precision spectroscopy we lock a diode laser to a fs-frequency comb and find a relative linear drift of 314 Hz during a 2.8 h period.
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PACS
42.62.Fi; 42.62.Eh
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Strauß, N., Ernsting, I., Schiller, S. et al. A simple scheme for precise relative frequency stabilization of lasers. Appl. Phys. B 88, 21–28 (2007). https://doi.org/10.1007/s00340-007-2668-9
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DOI: https://doi.org/10.1007/s00340-007-2668-9