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Title: 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser

Abstract

We present an 8-beam local oscillator (LO) for the astronomically significant [OI] line at 4.7 THz. The beams are generated using a quantum cascade laser (QCL) in combination with a Fourier phase grating. The grating is fully characterized using a third order distributed feedback (DFB) QCL with a single mode emission at 4.7 THz as the input. The measured diffraction efficiency of 74.3% is in an excellent agreement with the calculated result of 75.4% using a 3D simulation. We show that the power distribution among the diffracted beams is uniform enough for pumping an array receiver. To validate the grating bandwidth, we apply a far-infrared (FIR) gas laser emission at 5.3 THz as the input and find a very similar performance in terms of efficiency, power distribution, and spatial configuration of the diffracted beams. Both results represent the highest operating frequencies of THz phase gratings reported in the literature. By injecting one of the eight diffracted 4.7 THz beams into a superconducting hot electron bolometer (HEB) mixer, we find that the coupled power, taking the optical loss into account, is in consistency with the QCL power value.

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [5];  [6]
  1. Delft University of Technology (The Netherlands). Kavli Institute of Nanoscience
  2. SRON Netherlands Institute for Space Research (The Netherlands)
  3. Arizona State Univ., Tempe, AZ (United States). School of Earth and Space Exploration
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Department of Electrical Engineering and Computer Science
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
  6. Delft University of Technology (The Netherlands). Kavli Institute of Nanoscience; SRON Netherlands Institute for Space Research (The Netherlands)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
OSTI Identifier:
1411612
Report Number(s):
SAND-2017-8886J
Journal ID: ISSN 1094-4087; OPEXFF; 656371; TRN: US1800249
Grant/Contract Number:
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 24; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 24 POWER TRANSMISSION AND DISTRIBUTION; Diffraction gratings; Semiconductor lasers; quantum cascade; Heterodyne; Far infrared or terahertz; Arrays; Astronomical optics

Citation Formats

Mirzaei, B., Silva, J. R. G., Hayton, D., Groppi, C., Kao, T. Y., Hu, Q., Reno, J. L., and Gao, J. R. 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser. United States: N. p., 2017. Web. doi:10.1364/oe.25.029587.
Mirzaei, B., Silva, J. R. G., Hayton, D., Groppi, C., Kao, T. Y., Hu, Q., Reno, J. L., & Gao, J. R. 8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser. United States. doi:10.1364/oe.25.029587.
Mirzaei, B., Silva, J. R. G., Hayton, D., Groppi, C., Kao, T. Y., Hu, Q., Reno, J. L., and Gao, J. R. Mon . "8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser". United States. doi:10.1364/oe.25.029587. https://www.osti.gov/servlets/purl/1411612.
@article{osti_1411612,
title = {8-beam local oscillator array at 47 THz generated by a phase grating and a quantum cascade laser},
author = {Mirzaei, B. and Silva, J. R. G. and Hayton, D. and Groppi, C. and Kao, T. Y. and Hu, Q. and Reno, J. L. and Gao, J. R.},
abstractNote = {We present an 8-beam local oscillator (LO) for the astronomically significant [OI] line at 4.7 THz. The beams are generated using a quantum cascade laser (QCL) in combination with a Fourier phase grating. The grating is fully characterized using a third order distributed feedback (DFB) QCL with a single mode emission at 4.7 THz as the input. The measured diffraction efficiency of 74.3% is in an excellent agreement with the calculated result of 75.4% using a 3D simulation. We show that the power distribution among the diffracted beams is uniform enough for pumping an array receiver. To validate the grating bandwidth, we apply a far-infrared (FIR) gas laser emission at 5.3 THz as the input and find a very similar performance in terms of efficiency, power distribution, and spatial configuration of the diffracted beams. Both results represent the highest operating frequencies of THz phase gratings reported in the literature. By injecting one of the eight diffracted 4.7 THz beams into a superconducting hot electron bolometer (HEB) mixer, we find that the coupled power, taking the optical loss into account, is in consistency with the QCL power value.},
doi = {10.1364/oe.25.029587},
journal = {Optics Express},
number = 24,
volume = 25,
place = {United States},
year = {Mon Nov 13 00:00:00 EST 2017},
month = {Mon Nov 13 00:00:00 EST 2017}
}

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