Mechanism for reducing recovery time of optical nonlinearity in semiconductor laser amplifier

Masashi Usami, Munefumi Tsurusawa, Yuichi Matsushima

Research output: Contribution to journalArticle

61 Citations (Scopus)


We propose and demonstrate a novel scheme to reduce the recovery time of optical nonlinearity in a semiconductor laser optical amplifier driven under a loss condition for the signal light pulse. Additional light, which is set at a transparency wavelength in the active layer, promotes stimulated recombination of excess carriers induced by the absorption of the signal light. This scheme excludes any additional carrier transport mechanism and nonradiative recombination and hence generation of heat. The principle of operation is experimentally verified by measuring time-domain transmission variance using a pump-probe method. A drastic reduction of the excess-carrier lifetime to less than 70 ps was confirmed.

Original languageEnglish
Pages (from-to)2657-2659
Number of pages3
JournalApplied Physics Letters
Issue number21
Publication statusPublished - 1998
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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