Terahertz quantum-cascade metasurface VECSELs (Conference Presentation)

Benjamin S. Williams; Luyao Xu; Christopher A. Curwen; John L. Reno; Tatsuo Itoh

doi:10.1117/12.2251447

20 April 2017 Terahertz quantum-cascade metasurface VECSELs (Conference Presentation)

Benjamin S. Williams, Luyao Xu, Christopher A. Curwen, John L. Reno, Tatsuo Itoh

Proceedings Volume 10123, Novel In-Plane Semiconductor Lasers XVI; 1012311 (2017) https://doi.org/10.1117/12.2251447
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

Terahertz quantum-cascade vertical external cavity surface emitting laser (VECSELs) are made possible through the development of amplifying reflectarray metasurfaces. The metasurface is made up of sub-wavelength arrays of antenna coupled sub-cavities loaded with quantum-cascade active material. The QC-VECSEL approach allows scaling of laser power while maintaining a high quality, near diffraction limited beam - something which has been a long standing challenge for THz quantum-cascade lasers with sub-wavelength metallic waveguides. The latest results of cavity and metasurface engineering are presented, including the demonstration of a focusing reflectarray metasurface that enables a "flat-optics" hemispherical VECSEL cavity, with improved geometric stability and a Gaussian profile beam with beam quality parameter of M2=1.3.

Conference Presentation

Citation Download Citation

Benjamin S. Williams, Luyao Xu, Christopher A. Curwen, John L. Reno, and Tatsuo Itoh "Terahertz quantum-cascade metasurface VECSELs (Conference Presentation)", Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 1012311 (20 April 2017); https://doi.org/10.1117/12.2251447

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