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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:
; ; ; ; ; ; ;
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:
1408782
Alternate Identifier(s):
OSTI ID: 1411612
Report Number(s):
SAND-2017-8886J
Journal ID: ISSN 1094-4087; OPEXFF
Grant/Contract Number:  
NA0003525; AC04-94AL85000
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express 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.
@article{osti_1408782,
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 = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.25.029587

Citation Metrics:
Cited by: 6 works
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Figures / Tables:

Figure. 1 Figure. 1: The calculated and manufactured 2D cross-section profiles of a unit cell. Z shows the depth, and X and Y are the two lateral directions. The dashed black and solid red curves are the manufactured and calculated results respectively.

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