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2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers

Deninger, Anselm J. ; Roggenbuck, Alex ; Schindler, S. ; Preu, Sascha (2022):
2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers. (Publisher's Version)
In: Journal of Infrared, Millimeter, and Terahertz Waves, 36 (3), pp. 269-277. Springer, ISSN 1866-6892, e-ISSN 1866-6906,
DOI: 10.26083/tuprints-00020609,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: 2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers
Language: English
Abstract:

To date, exploiting the full bandwidth of state-of-the-art InGaAs photomixers for generation and detection of continuous-wave (CW) THz radiation (typ. ~50 GHz to ~3 THz) required complex and costly external-cavity diode lasers with motorized resonator control. Distributed feedback (DFB) lasers, by contrast, are compact and inexpensive, but the tuning range per diode is limited to ~600 GHz at 1.5 μm. In this paper, we show that a combination of three DFB diodes covers the complete frequency range from 0 – 2750 GHz without any gaps. In combination with InGaAs-based photomixers for terahertz generation and detection, the system achieves a dynamic range of > 100 dB at 56 GHz, 64 dB at 1000 GHz, and 26 dB at 2500 GHz. A field-programmable gate array (FPGA)-based lock-in amplifier permits a flexible adjustment of the integration time from 0.5 ms to 600 ms. Employing an optimized “fast scan” mode, a spectrum of ~1200 GHz – the bandwidth of each subset of two lasers – and 40 MHz steps is acquired in less than one minute, still maintaining a reasonable dynamic range. To the best of our knowledge, the bandwidth of 2.75 THz presents a new record for DFB-based CW-terahertz systems.

Journal or Publication Title: Journal of Infrared, Millimeter, and Terahertz Waves
Volume of the journal: 36
Issue Number: 3
Publisher: Springer
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP) > Terahertz Devices and Systems
LOEWE > LOEWE-Schwerpunkte > STT - Sensors Towards Terahertz
Date Deposited: 18 Feb 2022 13:14
Last Modified: 18 Feb 2022 13:15
DOI: 10.26083/tuprints-00020609
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-206095
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20609
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