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Proceedings Paper

Chirp In Picosecond Semiconductor Film Lasers And Passive Pulse Compression In Optical Fibers
Author(s): Jay M. Wiesenfeld; Julian Stone; Dietrich Marcuse
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Paper 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.

Paper Details

Date Published: 28 November 1983
PDF: 8 pages
Proc. SPIE 0439, Picosecond Optoelectronics, (28 November 1983); doi: 10.1117/12.966076
Show Author Affiliations
Jay M. Wiesenfeld, Bell Laboratories (United States)
Julian Stone, Bell Laboratories (United States)
Dietrich Marcuse, Bell Laboratories (United States)

Published in SPIE Proceedings Vol. 0439:
Picosecond Optoelectronics
Gerard A. Mourou, Editor(s)

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