Title :
Emission intensity from terahertz quantum cascade lasers under near-infrared optical pulse injection
Author :
Sakasegawa, Y. ; Saito, S. ; Sekine, N. ; Ashida, M. ; Hosako, I.
Author_Institution :
Nat. Inst. for Inf. & Commun. Technol., Koganei, Japan
Abstract :
We have investigated intensity change of terahertz emission from terahertz quantum cascade lasers under optical injection of near-infrared femtosecond laser pulses. THz intensities were suppressed by optical injections and their extinction ratios were dependent on the time delay of optical pulses. Recovery times from the suppressed states to the pre-excited states, for interband and intersubband excitations, were 40ns and 400ns, respectively.
Keywords :
high-speed optical techniques; quantum cascade lasers; THz intensities; emission intensity; extinction ratios; intensity change; interband excitations; intersubband excitations; near-infrared femtosecond laser pulses; near-infrared optical pulse injection; optical injections; optical pulses; pre-excited states; recovery times; suppressed states; terahertz emission; terahertz quantum cascade lasers; time 40 ns; time 400 ns; time delay; Delay effects; Modulation; Optical pulses; Quantum cascade lasers; Stimulated emission; Substrates; Ultrafast optics;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2012 37th International Conference on
Conference_Location :
Wollongong, NSW
Print_ISBN :
978-1-4673-1598-2
Electronic_ISBN :
2162-2027
DOI :
10.1109/IRMMW-THz.2012.6380462
