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Optica Publishing Group
  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CJ7_2

Spectral characterization of a narrow linewidth, single-frequency 780 nm fiber laser source for atom cooling applications

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Abstract

780 nm narrowband laser sources (corresponding to Rubidium D2 line) are useful for cooling and trapping atoms for, by example, Bose-Einstein condensation or gravimetry applications [1]. For laser spectral characterization with a linewidth of 100 kHz or less, the standard delayed self-heterodyne interferometric technique needs at least ten kilometers of fiber delay and becomes difficult to implement at visible or near-infrared wavelengths due to excessive fiber attenuation. Moreover, results interpretation is problematic when laser frequency noise is not dominated by white noise [2]. We then propose and experiment in the following an alternative method for laser linewidth determination at 780 nm based on frequency noise spectrum measurement.

© 2011 Optical Society of America

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