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Colliding-pulse passive harmonic mode-locking in a femtosecond Yb-doped fiber laser with a semiconductor saturable absorber

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Abstract

We demonstrate a passive harmonic mode-locked femtosecond Yb-doped fiber laser employing a semiconductor saturable absorber in a colliding-pulse configuration. 380-fs pulses at 605 MHz repetition rate with >60 dB supermode suppression is achieved.

©2004 Optical Society of America

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Figures (9)

Fig. 1.
Fig. 1. The experimental configuration, Ls is set to be 1/14 of the total cavity length.
Fig. 2. (a)
Fig. 2. (a) The configuration of the pump-probe experiment.
Fig. 2. (b)
Fig. 2. (b) The transmission spectrum of the SSA.
Fig. 2. (c)
Fig. 2. (c) Transmission response of the SSA measured by the pump-probe
Fig. 3. (a)
Fig. 3. (a) Optical spectrum of the fundamental mode-locking caused by the SSA.
Fig. 3. (b)
Fig. 3. (b) RF spectrum of the fundamental mode-locking caused by the SSA.
Fig. 3. (c)
Fig. 3. (c) Optical spectrum of the 14th harmonic mode-locking.
Fig. 3. (d)
Fig. 3. (d) RF spectrum of the 14th harmonic mode-locking at 605 MHz, the supermode suppression is >60 dB.
Fig. 4.
Fig. 4. (a) The interferometric auto-correlation of the pulse at 14th harmonic, the FWHM of the trace is ~650-fs, the FWHM of the pulse is estimated to be ~380-fs; (b) The pulse train of the 14th harmonic mode-locking at 605 MHz; (c) Cross-correlation between adjacent pulses, the FWHM of the trace is ~820-fs.
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