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  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper EG1_3

Broadband Precision Spectroscopy using a Scanning Diode Laser and a Frequency Comb

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Abstract

We present a versatile approach that allows for both precise and broadband measurements of transmission spectra by transferring the precision of an optical frequency comb to a mode-hop free tunable external cavity diode laser. The advantage of using a tunable diode laser compared to other methods such as direct frequency comb spectroscopy [1] or multi-heterodyne spectroscopy [2] is the ability to resolve spectral features that are much smaller than the repetition rate of the employed frequency combs (for instance the MHz-linewidth modes of an ultra liigh-Q microcavity). The potential of the technique is demonstrated by measuring for the first time the small residual dispersion of optical microcavities [3,4], Figure 1 depicts the measurement setup that has been used for broadband spectroscopy of the mode structure of a microresonator.

© 2009 IEEE

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