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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper EG1_2

Frequency Comb Generation in Crystalline MgF2 Whispering-Gallery Mode Resonators

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Ultra-high-Q whispering gallery mode (WGM) resonators, with the ability to confine and store optical energy in small volumes enable optical frequency comb generation via four-wave mixing (FWM) [1] as first demonstrated in fused silica microtoroids [2,3]. In contrast to fused silica, resonators made from crystalline materials [4-9] such as CaF2, MgF2 and quartz feature exceptionally low loss over a broad spectral window, ranging from the UV (ca. 160 nm) to the mid-infrared (ca. 8 micron). Moreover, the millimeter sizes of crystalline resonators enable the repetition rates of the combs to be in the range of few tens of gigahertz. These repetition rates are of special interest to astrophysical spectrometer calibration [10, 11], and are not directly accessible with conventional frequency combs based on mode-locked lasers.

© 2011 IEEE

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