Publisher Correction: High power surface emitting terahertz laser with hybrid second- and fourth-order Bragg gratings

Journal Article · Mon May 14 00:00:00 EDT 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-04400-8· OSTI ID:1629049

Jin, Yuan ^[1]; Gao, Liang ^[1]; Chen, Ji ^[1]; Wu, Chongzhao ^[1]; Reno, John L. ^[2]; Kumar, Sushil ^[1]

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1. Lehigh University, Bethlehem, PA (United States). Dept. of Electrical and Computer Engineering
2. Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States). Center of Integrated Nanotechnologies

A surface-emitting distributed feedback (DFB) laser with second-order gratings typically excites an antisymmetric mode that has low radiative efficiency and a double-lobed far-field beam. The radiative efficiency could be increased by using curved and chirped gratings for infrared diode lasers, plasmon-assisted mode selection for mid-infrared quantum cascade lasers (QCLs), and graded photonic structures for terahertz QCLs. Here, we demonstrate a new hybrid grating scheme that uses a superposition of second and fourth-order Bragg gratings that excite a symmetric mode with much greater radiative efficiency. The scheme is implemented for terahertz QCLs with metallic waveguides. Peak power output of 70 mW with a slope-efficiency of 993 mW A^-1 is detected with robust single-mode single-lobed emission for a 3.4 THz QCL operating at 62 K. The hybrid grating scheme is arguably simpler to implement than aforementioned DFB schemes and could be used to increase power output for surface-emitting DFB lasers at any wavelength.

• Research Organization: Sandia National Laboratory (SNL), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE/Office of Science (SC); National Science Foundation (NSF); Center for Integrated Nanotechnologies
• Grant/Contract Number: NA0003525; ECCS 1351142; ECCS 1609168; CMMI 1437168
• OSTI ID: 1629049
• Journal Information: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
• Publisher: Nature Publishing Group
• Country of Publication: United States
• Language: English