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Proceedings Paper

Terahertz quantum-cascade metasurface VECSELs (Conference Presentation)
Author(s): Benjamin S. Williams; Luyao Xu; Christopher A. Curwen; John L. Reno; Tatsuo Itoh

Paper 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.

Paper Details

Date Published: 20 April 2017
PDF: 1 pages
Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 1012311 (20 April 2017); doi: 10.1117/12.2251447
Show Author Affiliations
Benjamin S. Williams, Univ. of California, Los Angeles (United States)
Luyao Xu, Univ. of California, Los Angeles (United States)
Christopher A. Curwen, Univ. of California, Los Angeles (United States)
John L. Reno, Sandia National Labs. (United States)
Tatsuo Itoh, Univ. of California, Los Angeles (United States)

Published in SPIE Proceedings Vol. 10123:
Novel In-Plane Semiconductor Lasers XVI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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