Fabry–Pérot filter cavities for wide-spaced frequency combs with large spectral bandwidth |
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Authors: | T Steinmetz T Wilken C Araujo-Hauck R Holzwarth T W H?nsch T Udem |
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Institution: | 1. Max-Planck-Institut für Quantenoptik, Hans Kopfermann Str. 1, 85748, Garching, Germany 3. Menlo Systems GmbH, Am Klopferspitz 19, 82152, Martinsried, Germany 2. European Southern Observatory, Karl-Schwarzschild-Str. 3, 85748, Garching, Germany
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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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