Chirp In Picosecond Semiconductor Film Lasers And Passive Pulse Compression In Optical Fibers

Jay M. Wiesenfeld; Julian Stone; Dietrich Marcuse

doi:10.1117/12.966076

28 November 1983 Chirp In Picosecond Semiconductor Film Lasers And Passive Pulse Compression In Optical Fibers

Jay M. Wiesenfeld, Julian Stone, Dietrich Marcuse

Proceedings Volume 0439, Picosecond Optoelectronics; (1983) https://doi.org/10.1117/12.966076
Event: 27th Annual Technical Symposium, 1983, San Diego, United States

Abstract

Picosecond pulses from optically pumped, ultrashort cavity semiconductor film lasers have a large positive chirp that is not linear in time. Average chirp values are about 1 nm/psec for InGaAsP film lasers. The chirp is caused by transient change in the refractive index of the semiconductor film during the pulse due to variation of the free carrier concentration. The transient carrier concentrations of 10²⁰ cm^-3 caused by the intense picosecond pump pulses is sufficient to account for the observed chirp. For film lasers, the dominant mechanism by which the carriers affect the index of refraction is free carrier plasma refraction. The positively chirped pulses have been compressed by the negative linear group velocity dispersion of 8m of single-mode optical fiber. Pulse compression factors as large as 3.4 have been obtained. Pulses as short as 2.5 psec at 1.23 μm and 3.4 ps at 1.42 μm have been generated by this compression scheme.

Citation Download Citation

Jay M. Wiesenfeld, Julian Stone, and Dietrich Marcuse "Chirp In Picosecond Semiconductor Film Lasers And Passive Pulse Compression In Optical Fibers", Proc. SPIE 0439, Picosecond Optoelectronics, (28 November 1983); https://doi.org/10.1117/12.966076

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