Title :
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
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;
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
DOI :
10.1109/TERA.2008.4673829
