Coherent emission from integrated Talbot-cavity quantum cascade lasers Article Swipe

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Talbot effect Optics Cascade Laser Quantum cascade laser Laser beam quality Materials science Wavelength Semiconductor laser theory Beam (structure) Phase (matter) Optoelectronics Physics Realization (probability) Laser beams Diffraction Quantum mechanics Chemistry Mathematics Chromatography Statistics

Bo Meng , Bo Qiang , Étienne Rodriguez , Xiao Nan Hu , Lianhe Li , Qi Jie Wang ·

YOU? · · 2017 · Open Access · · DOI: https://doi.org/10.1364/oe.25.003077 · OA: W2586906873

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.