Title :
Frequency Manipulation of THz Bound-to-Continuum Quantum-Cascade Lasers
Author :
Freeman, Joshua R. ; Worrall, Christopher ; Apostolopoulos, Vasilis ; Alton, Jesse ; Beere, Harvey ; Ritchie, David A.
Author_Institution :
Cambridge Univ., Cambridge
Abstract :
The laser emission frequencies of existing designs are controlled by uniform thickness transformations. Experimental results from a total of ten wafers are presented demonstrating a predictable shift in the emission wavelength concurrent with an anticipated alteration in electrical transport. Wafers based on a design around 2.9 THz produced a frequency shift of 0.35 THz. Furthermore, a 2.5% thickness reduction in our 2-THz design saw a 0.1-THz frequency shift and changes in electrical transport predicted by simulations.
Keywords :
III-V semiconductors; aluminium compounds; gallium compounds; quantum cascade lasers; submillimetre wave lasers; GaAs-AlGaAs; THz bound-to-continuum quantum-cascade lasers; electrical transport; emission wavelength; frequency 2 THz; frequency 2.9 THz; frequency manipulation; frequency shift; laser emission frequencies; thickness reduction; uniform thickness transformations; Frequency; Laser transitions; Optical control; Optical design; Power engineering and energy; Predictive models; Quantum cascade lasers; Satellites; Semiconductor lasers; Thickness control; Frequency control; intersubband transitions; quantum cascade laser (QCL); semiconductor laser; terahertz (THz);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.913340
