Beam quality analysis of the mid-infrared fiber coupled quantum cascade laser
Quantum cascade laser (QCL) emitting in the mid-wave infrared atmospheric windows (3 μm to 5 μm) will be of immediate use to several civilian applications, including airborne self-defense protection system and trace gas sensing and free space optical communications. In this work, a theoretical and experimental study of laser coupling in fiber-optic waveguide with small-bore diameters of d =105 μm. The output nearfield and farfield beam quality of the QCL transmission out of the mid-infrared fiber is analyzed. The output laser nearfield and the farfiled of a QCL with nearly 500 mW continuous wave power at room temperature is measured by a two-dimensional beam quality analyzer. Results show that the output nearfield and farfield is nearly super-Gaussian distributed after tansmition from the singlemode fiber when the laser is coupled into the fiber core.
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Academy of Opto-Electronics (China)
Sensen Li received the B.S., M.S. and the Ph.D. degrees in physical electronics from Harbin Institute of Technology in 2016. He is senior engineer of Science and Technology Electro-optical Information Security Control Laboratory in Academy of Opto-Electronics of China Electronics Technology Group Corporation since 2016. His research interests include high power laser and its beam quality improving, mid-infrared semiconductor laser and its applications. He has over 60 publications in laser technology. Hi is an editorial board member of "Electric-Optic Technology Application" magazine.