Open AccessCoherent emission from integrated Talbot-cavity quantum cascade lasers
Author(s) -
Bo Meng,
Bo Qiang,
Ezequiel Rodríguez,
Xiao Hu,
Guozhen Liang,
Qi Jie Wang
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.003077
Subject(s) - talbot effect , optics , cascade , laser , quantum cascade laser , laser beam quality , materials science , wavelength , beam (structure) , semiconductor laser theory , optoelectronics , phase (matter) , realization (probability) , physics , laser beams , diffraction , chemistry , statistics , mathematics , chromatography , quantum mechanics
We report experimental realization of phase-locked quantum cascade laser (QCL) array using a monolithically integrated Talbot cavity. An array with six laser elements at a wavelength of ~4.8 μm shows a maximum peak power of ~4 W which is more than 5 times higher than that of a single ridge laser element and a slope efficiency of 1 W/A at room temperature. Operation of in-phase coherent supermode has been achieved over the whole dynamic range of the Talbot-cavity QCL. The structure was analysed using a straightforward theoretical model, showing quantitatively good agreement with the experimental results. The reduced thermal resistance makes the structure an attractive approach to achieve high beam quality continuous wave QCLs.