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Pulse energy equalization in harmonically FM mode-locked lasers with slow gain

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Abstract

Harmonic mode locking in lasers with slow gain relaxation times requires fast intensity-dependent loss (fast loss) to equalize the pulse energies. A practical method to obtain fast loss is to use self-phase modulation and spectral filtering (SPM+F). We show that in a frequency modulation mode-locked laser SPM+F produces a fast loss only when the cavity dispersion is anomalous. In the absence of SPM the dispersion creates a gain imbalance between the pulsing modes in the upchirped and downchirped modulation cycles, which causes one mode to dominate over the other.

© 1996 Optical Society of America

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