Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 96, Issue 2-3, Pages 251-256Publisher
SPRINGER
DOI: 10.1007/s00340-009-3374-6
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Funding
- DFG cluster of excellence Munich Centre for Advanced Photonics (MAP)
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We use low-finesse Fabry-P,rot 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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