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

K. Tamura, M. Nakazawa

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1930-1932
Number of pages3
JournalOptics Letters
Volume21
Issue number23
DOIs
Publication statusPublished - 1996 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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