TITLE

Coherent coupling of ring cavity surface emitting quantum cascade lasers

AUTHOR(S)
Schwarzer, Clemens; Mujagic, Elvis; Yu Yao; Schrenk, Werner; Chen, Jianxin; Gmachl, Claire; Strasser, Gottfried
PUB. DATE
August 2010
SOURCE
Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p071103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present investigations on coherent coupling of surface emitting quantum cascade lasers (QCLs). For this purpose, the evanescent field coupling method is exploited under incorporation of a ring cavity surface emitting QCL pair with an emission wavelength of ≈8 μm. A series of these pairs with intercavity separations of 1 and 3 μm was fabricated. The coupling gap of 1 μm yields robust phase-locked light source pairs with coherent emission at all injection currents and a corresponding threshold current density of 2.65 kA/cm2 at room-temperature.
ACCESSION #
52997987

 

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