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

fYear

2012

fDate

23-28 Sept. 2012

Firstpage

1

Lastpage

2

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2012 37th International Conference on

Conference_Location

Wollongong, NSW

ISSN

2162-2027

Print_ISBN

978-1-4673-1598-2

Electronic_ISBN

2162-2027

Type

conf

DOI

10.1109/IRMMW-THz.2012.6380462

Filename

6380462