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

Gang Chen; Bethea, Clyde G.; Martini, Rainer; Grant, P. D.; Dudek, R.; Liu, H. C.
September 2009
Applied Physics Letters;9/7/2009, Vol. 95 Issue 10, p101104
Academic Journal
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.


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