Title :
Intra-pulse modal instability and beam steering in Quantum Cascade laser
Author :
Yu Yao ; Bouzi, Pierre M. ; Aung, Nyan L. ; Liu, Peter Q. ; Huang, Yi-Pai ; Gmachl, C. ; Xiaojun Wang
Author_Institution :
Princeton Univ., Princeton, NJ, USA
Abstract :
Time-resolved far-field measurements of Quantum Cascade lasers show intra-pulse beam steering on the nanosecond scale. Spatially-dependent spectra at different pulse times show evidence of frequency locking between transverse modes when the beam steering happens. The light pulse instability has been found to reduce the device received output power by 20% in some cases. A proposal on how to reduce the instability by transverse mode control is presented.
Keywords :
beam steering; laser beams; laser mode locking; laser stability; optical control; quantum cascade lasers; device received output power; frequency locking; intrapulse modal instability; light pulse instability; nanosecond scale intrapulse beam steering; pulse times; quantum cascade laser; spatially-dependent spectra; time-resolved far-field measurements; transverse mode control; Beam steering; Detectors; Laser beams; Laser mode locking; Logic gates; Measurement by laser beam; Quantum cascade lasers; Quantum Cascade laser; beam steering; instability;
Conference_Titel :
Lester Eastman Conference on High Performance Devices (LEC), 2012
Conference_Location :
Singapore
Print_ISBN :
978-1-4673-2298-0
Electronic_ISBN :
978-1-4673-2300-0
DOI :
10.1109/lec.2012.6410997
