Fabry-Pérot filter cavities for wide-spaced frequency combs with large spectral bandwidth

Details Fabry-Pérot filter cavities for wide-spaced frequency combs with large spectral bandwidth Fabry-Pérot filter cavities for wide-spaced frequency combs with large spectral bandwidth

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apphb..96..251s&link_type=abstract

Applied Physics B, Volume 96, Issue 2-3, pp. 251-256

Physics

12

42.60.Da, 42.60.Fc, 42.62.Eh, 95.10.Jk

Scientific paper

We use low-finesse Fabry-Pérot cavities in series to generate frequency combs with a large mode spacing in a way that allows its application to a large optical bandwidth. The attenuation of laser modes closest to the pass bands of the cavity exceeds 70 dB for a filter ratio of m=20 relative to the resonant modes centered within the pass bands. We also identify the best cavity geometry to suppress spurious transmission of higher order transversal modes. Such a thinned out frequency comb can be used to calibrate traditional spectrographs for precision astronomy. In the time domain mode filtering generates a pulse train with a multiplied repetition rate. High-fidelity filtering, as described here, implies small variations of the pulse energies.

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