Phase locking a 4.7 THz quantum cascade laser using a super-lattice diode as harmonic mixer

Khudchenko, Andrey; Hayton, D. J.; Pavelyev, D. G.; Baryshev, A.; Gao, J. R.; Kao, T. Y.; Hu, Qing; Reno, John L.; Вакс, В. Л.

doi:10.1109/irmmw-thz.2014.6956455

Cited by 13 publications

(8 citation statements)

References 7 publications

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“…In 2013, Hayton et al [9] reported both, frequency and phase, locking of a 3.4-THz QCL to a ×15-harmonic signal generated by a superlattice harmonic mixer operating at room temperature. Subsequently, in 2014 they reported phase locking of a 4.7-THz QCL to a superlattice harmonic mixer, which was cooled to 10 K and resulted in a beat signal with a signal-to-noise ratio (SNR) of 20 dB [10].…”

Section: Introductionmentioning

confidence: 99%

A 3.5-THz, x6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

Jayasankar¹,

Drakinskiy²,

Rothbart³

et al. 2021

Preprint

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Efficient and compact frequency converters are essential for frequency stabilization of terahertz sources. In this paper, we present a 3.5-THz, x6-harmonic, integrated Schottky diode mixer operating at room temperature. The designed frequency converter is based on a single-ended, planar Schottky diode with a sub-micron anode contact area defined on a suspended 2-um ultra-thin GaAs substrate. The dc-grounded anode pad was combined with the radio frequency E-plane probe, which resulted in an electrically compact circuit. At 200 MHz intermediate frequency, a mixer conversion loss of about 59 dB is measured resulting in a 40 dB signal-to-noise ratio in a phase-locking application. Using a quasi-static diode model combined with electromagnetic simulations, good agreement with the measured results was obtained. Harmonic frequency converters without the need of cryogenic cooling will help in the realization of highly sensitive space and air-borne heterodyne receivers.<br>

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Section: Introductionmentioning

confidence: 99%

A 3.5-THz, x6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

Jayasankar¹,

Drakinskiy²,

Rothbart³

et al. 2021

Preprint

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“…However, only in [18] it was shown phase locking at 4.7 THz, all the other QCLs are below 3 THz. Though, one of the most interesting applications for QCL is a role of LO in on-board heterodyne receiver at 4.7 THz to observe atomic oxygen line [4][5][6][7][8].…”

mentioning

confidence: 96%

“…The authors phase locked a 3.4 THz 1 mW distributed feedback (DFB) laser to the 18th harmonic of a 190.7 GHz reference source using a room temperature GaAs/AlAs superlattice diode. Next year Khudchenko et al [18] employed the same technique for 4.7 THz 0.25 mW QCL. The key element of this scheme (see fig.…”

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confidence: 99%

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Overview of Techniques for THz QCL phase-locking

et al. 2018

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“…This paper presents the design and characterization of a wideband 1.8-3.2 THz WM-86 (WR-0.34) mixer that uses lower harmonic factors to present lower conversion loss for different applications such as phase locking THz QCLs by down-converting the THz signal to a lower frequency [11], [12]. Since the mixer is central to the phase locking system, development of mixers with low conversion loss is crucial to achieve phase locking at THz frequencies [13]- [15]. Phase locked THz QCL can be used as a compact LO source to build multipixel receivers, heterodyne interferometers, and tunable heterodyne spectrometers with high spectral resolution in the THz frequencies.…”

mentioning

confidence: 99%

Design and Characterization of 1.8–3.2 THz Schottky-Based Harmonic Mixers

Bulcha

Hesler

Drakinskiy

et al. 2016

IEEE Trans. THz Sci. Technol.

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A room-temperature Schottky diode-based WM-86 (WR-0.34) harmonic mixer was developed to build high-resolution spectrometers, and multipixel receivers in the terahertz (THz) region for applications such as radio astronomy, plasma diagnostics, and remote sensing. The mixer consists of a quartz-based local oscillator (LO), intermediate-frequency (IF) circuits, and a GaAs-based beam-lead THz circuit with an integrated diode. Measurements of the harmonic mixer were performed using a 2 THz solid-state source and 2.6906 THz QCL. A conversion loss of 27 dB for the third harmonic mixing and a conversion loss of 30 dB for the fourth harmonic mixing were achieved. This is the first development of a wideband WM-86 (WR-0.34) harmonic mixer with a planar Schottky diode integrated on a beam-lead THz circuit that uses a lower LO harmonic factor for 1.8-3.2 THz RF frequency. Furthermore, this result represents the best Schottky-based mixer in this frequency range.

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Phase locking a 4.7 THz quantum cascade laser using a super-lattice diode as harmonic mixer

Cited by 13 publications

References 7 publications

A 3.5-THz, x6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

A 3.5-THz, x6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

Overview of Techniques for THz QCL phase-locking

Design and Characterization of 1.8–3.2 THz Schottky-Based Harmonic Mixers

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