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Demonstration of down-chirped and chirp-free pulses from high-repetition-rate passively mode-locked lasers

Salvatore, Randal A. and Yariv, Amnon (1995) Demonstration of down-chirped and chirp-free pulses from high-repetition-rate passively mode-locked lasers. IEEE Photonics Technology Letters, 7 (10). pp. 1151-1153. ISSN 1041-1135. doi:10.1109/68.466573.

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Knowledge and control of the chirp parameters of semiconductor lasers is a prerequisite to obtaining transform-limited pulses and/or to compensate for group velocity dispersion in fiber. Here, we report measurements of the sign and magnitude of chirp in high-repetition-rate mode-locked semiconductor lasers. The chirp of these monolithic lasers is measured in the frequency domain, using filtering and cross-correlation techniques. For different injection currents, a range of different chirp values is measured, including strongly down-chirped pulses at higher injection currents and transform-limited pulses to slightly up-chirped pulses at lower injection currents. The pulse chirp and the resulting broadening are due to the algebraic addition of opposite-signed chirps due to saturation of the absorption section and the gain section. These may cancel each other under some conditions, leading to a soliton-like transform-limited pulse.

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Additional Information:“©1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.” Manuscript received May IO, 1995; revised June 28, 1995. This work was supported by the National Science Foundation under Grant ECS-9001272, and the Office of Naval Research under Grant N00014-91-J-1195. The authors would like to acknowledge J. O’Brien and J. Etching for helpful discussions about transient gratings in semiconductors, and T. R. Chen for providing reflection coatings.
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Deposited On:21 Sep 2005
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