High-speed all-optical modulation of a standard quantum cascade laser by front facet illumination

Gang Chen, Clyde G. Bethea, Rainer Martini, P. D. Grant, R. Dudek, H. C. Liu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

A simple experimental scheme to control intersubband lasing transition by optically induced nonresonant interband transition is presented, allowing for high-speed all-optical modulation of mid-infrared (MIR) quantum cascade laser (QCL). Illuminating the QCL front facet with 100 fs Ti:sapphire laser pulse, a fast modulation of a cw-MIR emission is observed with an estimated transient time of less than 81 ps, limited by instrument bandwidth, and a modulation depth of 18%. It has a great potential for high-speed modulation of high power QCL at room temperature.

Original languageEnglish
Article number101104
JournalApplied Physics Letters
Volume95
Issue number10
DOIs
StatePublished - 2009

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