Title :
Phase-locking of 2.4 and 2.7 Terahertz Quantum Cascade Lasers to a femtosecond mode-locked Er-fiber laser
Author :
Barbieri, S. ; Ravaro, M. ; Gellie, P. ; Santarelli, G. ; Amato, M. ; Manquest, C. ; Sirtori, C. ; Colombelli, R. ; Khanna, S.P. ; Linfield, E.H. ; Beere, H.E. ; Ritchie, D.A.
Author_Institution :
Lab. MPQ, Univ. Paris 7, Paris, France
Abstract :
We have used the Pockels effect in ZnTe to demonstrate that the frequency and the phase of Quantum Cascade Lasers emitting at 2.4 and 2.7 Terahertz can be actively stabilized to the n-th harmonic of the 90 MHz repetition rate of a commercial, mode-locked Er-doped fiber-laser. The beating between the stabilized QCL frequency and the harmonic of the repetition rate yielded a signal-to-noise ratio >; 80dB in 1 Hz bandwidth (limited by the resolution of our spectrum analyzer). The technique demonstrated is inherently broadband, in the sense that it allows to directly stabilize any QCL source provided that its frequency is within the spectral bandwidth of the fs-laser (~5 THz).
Keywords :
II-VI semiconductors; Pockels effect; doping; erbium; fibre lasers; high-speed optical techniques; laser mode locking; microwave photonics; quantum cascade lasers; terahertz wave devices; zinc compounds; JkJk:Er; Pockels effect; ZnTe; bandwidth 1 Hz; doping; femtosecond mode-locked fiber laser; frequency 2.4 THz; frequency 2.7 THz; phase-locking terahertz quantum cascade lasers; signal-to-noise ratio; Amplitude modulation; Bandwidth; Crystals; Laser mode locking; Optimized production technology; Quantum cascade lasers; Radio frequency;
Conference_Titel :
ICECom, 2010 Conference Proceedings
Conference_Location :
Dubrovnik
Print_ISBN :
978-1-61284-998-0
