DocumentCode :
1365375
Title :
Index Tuning for Precise Frequency Selection of Terahertz Quantum Cascade Lasers
Author :
Allen, Dan G. ; Hargett, Terry ; Reno, John L. ; Zinn, Alfred A. ; Wanke, Michael C.
Author_Institution :
Sandia Nat. Labs., Albuquerque, NM, USA
Volume :
23
Issue :
1
fYear :
2011
Firstpage :
30
Lastpage :
32
Abstract :
We demonstrate precise shifts of terahertz quantum cascade laser frequencies by micron-scale changes to the duty cycle of a distributed-feedback grating, which alters the mode index, as an alternative to nanometer scale changes to the grating pitch. This method allows fabrication of lasers within a couple of gigahertz of a specific target frequency, enabling the temperature/bias to be independently optimized. Waveguides incorporating a central stripe were found to promote lasing on the fundamental lateral (TM00) mode, while an added oxide refill and metal cap made the lasers insensitive to wire bond locations for improved longitudinal mode control.
Keywords :
diffraction gratings; laser modes; laser tuning; quantum cascade lasers; terahertz wave devices; distributed-feedback grating; frequency selection; grating pitch; index tuning; longitudinal mode control; terahertz quantum cascade lasers; Gratings; Indexes; Laser modes; Metals; Quantum cascade lasers; Tuning; Waveguide lasers; Distributed-feedback devices; laser tuning; local oscillators; quantum cascade devices; submillimeter wave devices;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2010.2090345
Filename :
5613916
Link To Document :
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