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.
In: Journal of Infrared, Millimeter, and Terahertz Waves, 2015, 36 (3)
doi: 10.26083/tuprints-00020609
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Deninger, Anselm J. ; Roggenbuck, Alex ; Schindler, S. ; Preu, Sascha |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | 2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers |
| Sprache: | Englisch |
| Publikationsjahr: | 2022 |
| Publikationsdatum der Erstveröffentlichung: | 2015 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Infrared, Millimeter, and Terahertz Waves |
| Jahrgang/Volume einer Zeitschrift: | 36 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.26083/tuprints-00020609 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/20609 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (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. |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-206095 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Mikrowellentechnik und Photonik (IMP) 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Mikrowellentechnik und Photonik (IMP) > THz Bauelemente und THz Systeme LOEWE LOEWE > LOEWE-Schwerpunkte LOEWE > LOEWE-Schwerpunkte > STT - Sensors Towards Terahertz – Neuartige Technologien für Life Sciences, Prozess- und Umweltmonitoring |
| Hinterlegungsdatum: | 18 Feb 2022 13:14 |
| Letzte Änderung: | 21 Feb 2022 11:13 |
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- 2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers. (deposited 18 Feb 2022 13:14) [Gegenwärtig angezeigt]
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