8-beam local oscillator array at 4.7 THz generated by a phase grating and a quantum cascade laser

B. Mirzaei, J. R.G. Silva, D. Hayton, Christopher Groppi, T. Y. Kao, Q. Hu, J. L. Reno, J. R. Gao

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)29587-29596
Number of pages10
JournalOptics Express
Volume25
Issue number24
DOIs
StatePublished - Nov 27 2017

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quantum cascade lasers
oscillators
gratings
gas lasers
distributed feedback lasers
bolometers
power efficiency
hot electrons
infrared lasers
pumping
receivers
bandwidth
configurations
diffraction
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Mirzaei, B., Silva, J. R. G., Hayton, D., Groppi, C., Kao, T. Y., Hu, Q., ... Gao, J. R. (2017). 8-beam local oscillator array at 4.7 THz generated by a phase grating and a quantum cascade laser. Optics Express, 25(24), 29587-29596. https://doi.org/10.1364/OE.25.029587

8-beam local oscillator array at 4.7 THz generated by a phase grating and a quantum cascade laser. / Mirzaei, B.; Silva, J. R.G.; Hayton, D.; Groppi, Christopher; Kao, T. Y.; Hu, Q.; Reno, J. L.; Gao, J. R.

In: Optics Express, Vol. 25, No. 24, 27.11.2017, p. 29587-29596.

Research output: Contribution to journalArticle

Mirzaei, B, Silva, JRG, Hayton, D, Groppi, C, Kao, TY, Hu, Q, Reno, JL & Gao, JR 2017, '8-beam local oscillator array at 4.7 THz generated by a phase grating and a quantum cascade laser', Optics Express, vol. 25, no. 24, pp. 29587-29596. https://doi.org/10.1364/OE.25.029587
Mirzaei, B. ; Silva, J. R.G. ; Hayton, D. ; Groppi, Christopher ; Kao, T. Y. ; Hu, Q. ; Reno, J. L. ; Gao, J. R. / 8-beam local oscillator array at 4.7 THz generated by a phase grating and a quantum cascade laser. In: Optics Express. 2017 ; Vol. 25, No. 24. pp. 29587-29596.
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