Abstract
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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Steinmetz, T., Wilken, T., Araujo-Hauck, C. et al. Fabry–Pérot filter cavities for wide-spaced frequency combs with large spectral bandwidth. Appl. Phys. B 96, 251–256 (2009). https://doi.org/10.1007/s00340-009-3374-6
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DOI: https://doi.org/10.1007/s00340-009-3374-6