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Title: Focusing metasurface quantum-cascade laser with a near diffraction-limited beam

A terahertz vertical-external-cavity surface-emitting-laser (VECSEL) is demonstrated using an active focusing reflectarray metasurface based on quantum-cascade gain material. The focusing effect enables a hemispherical cavity with flat optics, which exhibits higher geometric stability than a plano-plano cavity and a directive and circular near-diffraction limited Gaussian beam with M 2 beam parameter as low as 1.3 and brightness of 1.86 × 10 6 Wsr –1m –2. As a result, this work initiates the potential of leveraging inhomogeneous metasurface and reflectarray designs to achieve high-power and high-brightness terahertz quantum-cascade VECSELs.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND-2016-8993J
Journal ID: ISSN 1094-4087; OPEXFF; 647332
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 21; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; semiconductor lasers; quantum cascades; vertical emitting lasers; metamaterials
OSTI Identifier:
1340512

Xu, Luyao, Chen, Daguan, Itoh, Tatsuo, Reno, John L., and Williams, Benjamin S.. Focusing metasurface quantum-cascade laser with a near diffraction-limited beam. United States: N. p., Web. doi:10.1364/oe.24.024117.
Xu, Luyao, Chen, Daguan, Itoh, Tatsuo, Reno, John L., & Williams, Benjamin S.. Focusing metasurface quantum-cascade laser with a near diffraction-limited beam. United States. doi:10.1364/oe.24.024117.
Xu, Luyao, Chen, Daguan, Itoh, Tatsuo, Reno, John L., and Williams, Benjamin S.. 2016. "Focusing metasurface quantum-cascade laser with a near diffraction-limited beam". United States. doi:10.1364/oe.24.024117. https://www.osti.gov/servlets/purl/1340512.
@article{osti_1340512,
title = {Focusing metasurface quantum-cascade laser with a near diffraction-limited beam},
author = {Xu, Luyao and Chen, Daguan and Itoh, Tatsuo and Reno, John L. and Williams, Benjamin S.},
abstractNote = {A terahertz vertical-external-cavity surface-emitting-laser (VECSEL) is demonstrated using an active focusing reflectarray metasurface based on quantum-cascade gain material. The focusing effect enables a hemispherical cavity with flat optics, which exhibits higher geometric stability than a plano-plano cavity and a directive and circular near-diffraction limited Gaussian beam with M2 beam parameter as low as 1.3 and brightness of 1.86 × 106 Wsr–1m–2. As a result, this work initiates the potential of leveraging inhomogeneous metasurface and reflectarray designs to achieve high-power and high-brightness terahertz quantum-cascade VECSELs.},
doi = {10.1364/oe.24.024117},
journal = {Optics Express},
number = 21,
volume = 24,
place = {United States},
year = {2016},
month = {10}
}