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    Terahertz semiconductor laser with record-high output power tagged posts

    A Powerful Laser Breakthrough

    April 30, 2018, Categories  Physics, Technology/Electronics

    Top: A scanning electron microscope image of a high-power surface-emitting terahertz semiconductor laser with hybrid gratings. Multiple lasers are fabricated on a Gallium Arsenide semiconductor chip. Each laser is approximately 1.5mm long, 10 microns thick and varies in width between 0.1mm to 0.2mm. Bottom: Artistic illustration of the terahertz laser in operation. The laser's semiconductor material is sandwiched between metallic layers on both top and bottom. A periodic grating is introduced in the top metallic layer in the form of apertures from where light could leak out. An interplay of second- and fourth-order Bragg gratings (manifested as alternating single and double slits) leads to intense radiation from alternating periods of the periodic structure, combining coherently into a high quality single-lobed laser beam in the surface-normal direction. Credit: Sushil Kumar, Lehigh University

    Top: A scanning electron microscope image of a high-power surface-emitting terahertz semiconductor laser with hybrid gratings. Multiple lasers are fabricated on a Gallium Arsenide semiconductor chip. Each laser is approximately 1.5mm long, 10 microns thick and varies in width between 0.1mm to 0.2mm. Bottom: Artistic illustration of the terahertz laser in operation. The laser’s semiconductor material is sandwiched between metallic layers on both top and bottom. A periodic grating is introduced in the top metallic layer in the form of apertures from where light could leak out...

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