Multistable mode locking of InGaAsP semiconductor lasers

Kuznetsov, M.; Tsang, D. Z.; Walpole, J. N.; Liau, Z. L.; Ippen, E. P.
September 1987
Applied Physics Letters;9/21/1987, Vol. 51 Issue 12, p895
Academic Journal
We have investigated the pulsation behavior of InGaAsP semiconductor lasers with a proton-bombarded segment. These lasers emit picosecond (30–70 ps) pulses at gigahertz (0.6–3.0 GHz) rates. An antireflection-coated diode in an external cavity is passively mode locked and multistable; as many as four co-existing states are observed. Interlocking hysteresis loops are observed in the pulsation frequency, pulse width, and output power as functions of the bias current. A delayed feedback model explains qualitative features of the multistable mode locking. To our knowledge this is the first report of multistability of laser pulsation.


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