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Frequency-modulated laser beam with highly efficient intensity stabilisation

Frequency-modulated laser beam with highly efficient intensity stabilisation

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The limitation of the amplitude modulation rejection due to the spatial modulation of the output beam of an acousto-optic modulator, which is used in an active laser beam stabilisation system when a frequency modulation of a few megahertz is applied to this modulator, is analysed. It is shown how to overcome this problem, using a single-mode optical fibre at the output of the modulator. A residual amplitude modulation of 10−5 is achieved.

References

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      • G.C. Bjorklund . Frequency-modulation spectroscopy: a new method for measuring weak absorptions and dispersions. Opt. Lett. , 1 , 15 - 17
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    5. 5)
      • M. Gehrtz , G.C. Bjorklund , E.A. Whittaker . Quantum-limited laser frequency-modulation spectroscopy. J. Opt. Soc. Am. B , 9 , 1510 - 1526
    6. 6)
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