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Using only a short piece of gain fiber, a 570 MHz Yb-fiber oscillator was set up and mode-locked via NPE, assisted by spectral filtering. Tuning the filter enables changing both center wavelength or optical bandwidth.
We use low finesse Fabry-Perot cavities in series to generate frequency combs with large mode spacing by simultaneously maintaining high spectral bandwidth. The attenuation of laser modes closest to the pass band exceeds 70 dB relative to the modes centered within the pass band for a 5 GHz Fabry-Perot filtering a 250 MHz frequency comb.
Generation of 130-fs pulse trains at 1560 nm with 1 GHz repetition rate is demonstrated by locking a fundamentally mode-locked 200 MHz repetition rate fiber laser to a high finesse (F=2100) external Fabry-Perot cavity.
The development of high finesse resonators for broadband frequency combs enabled the extension of the versatile frequency comb technique into the extreme ultraviolet with all its implications. We describe new developments in this field.
Summary form only given. The reciprocal relationship between time and frequency implies that a single short laser pulse has a broad spectrum. A pulse circulating inside a laser cavity or the periodic pulse train if a mode-locked laser, however, can be described as a coherent superposition of discrete laser modes. This frequency-domain comb of modes is now providing an elegant and universal solution...
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