Frequency tunability and mode switching of 2.5 THz quantum cascade lasers

Author

Pavlov, Sergey G. ; Hübers, Heinz-Wilhelm ; Richter, Heiko ; Semenov, Alexei D. ; Tredicucci, Alessandro ; Mahler, Lukas ; Green, Richard P. ; Beere, Harvey E. ; Ritchie, David A.

Author_Institution

Inst. of Planetary Res., German Aerosp. Center, Berlin

fYear

2008

fDate

2-4 Oct. 2008

Firstpage

24

Lastpage

26

Abstract

Spectral characteristics of quantum cascade lasers operating at about 2.5 terahertz have been investigated by means of high-resolution mixing spectroscopy. Linewidth, frequency tunability and frequency stability of the lasers were measured by mixing their radiation with radiation from a 2.5 terahertz gas laser (heterodyne mixing). The results of the homodyne mixing of different modes of the laser indicate on laser mode switching and large variations of the effective refractive index in the active medium caused by the laser drive current.

Keywords

laser frequency stability; laser modes; laser tuning; optical testing; quantum cascade lasers; refractive index; frequency 2.5 THz; frequency stability; frequency tunability; high-resolution mixing spectroscopy; laser drive current; laser mode switching; quantum cascade lasers; refractive index; Frequency; Gallium arsenide; Gas lasers; Laser modes; Laser stability; Laser transitions; Laser tuning; Quantum cascade lasers; Spectroscopy; Temperature dependence; frequency tunability; heterodyne mixing; homodyne mixing; terahertz cascade lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

THz Radiation: Basic Research and Applications, 2008. TERA 2008. International Workshop

Conference_Location

Alushta

Print_ISBN

978-1-4244-2686-7

Electronic_ISBN

978-1-4244-2687-4

Type

conf

DOI

10.1109/TERA.2008.4673829

Filename

4673829