Abstract
In the present study, we report the passive harmonic mode-locking (HML) of the external cavity tapered semiconductor laser system with saw-toothed microstructure. The stable picosecond pulse trains were observed up to the third order HML. The mechanism behind the system was analyzed and single-pulse energy of 59 pJ with a repetition rate of 412 MHz and pulse duration of 3.9 ps was realized.
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