Compact and Inexpensive Terahertz System Driven by Monolithically Integrated Commercial Light Sources

Cherniak, Vladyslav; Kolpatzeck, Kevin; Liu, X.; Tybussek, Kai-Henning; Damyanov, D.; Schultze, Thorsten; Czylwik, Andreas; Balzer, Jan C.

doi:10.1109/irmmw-thz50926.2021.9567637

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Author year of publication System type Peak dynamic range / dB Bandwidth / THz * M. Tani et al 24 1997 QTDS/CCS 13 0.4 * O. Morikawa et al 25 44 2011 QTDS/CCS 30 1.1 * M. Scheller et al 45 2012 QTDS/CCS 55 0.6 J. C. et al 46 2016 QTDS/CCS 62 0.9 K. Merghem et al 35 2017 a) TDS 45 0.6 R. Kohlhaas et al 28 2017 b) QTDS/CCS 60 1.8 A. Rehn et 30 2018 QTDS/CCS 56 1 J. C. Balzer et al 47 2019 a) TDS 65 0.9 D. Molter et al 32 2019 b) QTDS/CCS 50 1.5 Tonder et al 48 2019 c) TDS 60 1 K. Tybussek et al 49 2019 d) TDS 56 1.4 K. Kolpatzeck et al 36 2020 a) TDS 68 1.6 V. Cherniak et al 50 2020 b) TDS 65 1.1 V. Cherniak et al 37 2021 a) TDS 70 1.22 K. Tybussek et al 33 2022 QTDS/CCS 60 2…”

Section: Signal Processingmentioning

confidence: 99%

“…An alternative approach that was first demonstrated by Merghem et al in 2017 35 is the use of a monolithic mode-locked laser diode (MLLD). Although the bandwidth and dynamic range achieved with this approach was rather modest at first, the switch from a conventional photoconductive emitter to an antenna-integrated photodiode led to an increase of the bandwidth and of the peak dynamic range to about 1.5 THz 36 and 70 dB 37 , respectively. While early works regarded this approach as a variation of THz-CCS/QTDS, a detailed system-theoretical analysis revealed that the long coherence length of the MLLD makes this concept much more akin to "conventional" THz-TDS 36 .…”

Section: Introductionmentioning

confidence: 99%

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Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Cherniak

Kubiczek

Kolpatzeck

et al. 2023

Preprint

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Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include – among others – imaging, material characterization, and layer thickness measurements. While THz-TDS has achieved significant success in research environments, the high cost and bulky nature of most systems have hindered widespread commercialization of this technology. Two primary factors contributing to the size and cost of these systems are the laser and the optical delay unit (ODU). Consequently, our group has focused on developing THz-TDS systems based on compact monolithic mode-locked laser diodes (MLLDs). The ultra-high repetition rate (UHRR) of the MLLD has the added benefit that it allows us to utilize shorter ODUs, thereby reducing the overall cost and size of our systems. However, achieving the necessary precision in the ODU to acquire accurate terahertz time-domain signals remains a crucial aspect.To address this issue, we have developed and enhanced an interferometric extension for UHRR-THz-TDS systems. This extension is inexpensive, compact, and easy to incorporate. In this article, we present the system setup, the extension itself, and the algorithmic procedure for reconstructing the delay axis based on the interferometric reference signal. We evaluate a dataset comprising 10,000 signal traces and report a standard deviation of the measured terahertz phase at 1.6 THz as low as 3 mrad. Additionally, we demonstrate a remaining peak-to-peak jitter of only 20 fs and a record-high peak dynamic range of 133 dB after averaging. The method presented in this paper allows for simplified THz-TDS system builds, reducing bulk and cost. As a result, it further facilitates the transition of terahertz technologies from laboratory to field applications.

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Section: Signal Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Cherniak

Kubiczek

Kolpatzeck

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

Cherniak,

Kubiczek,

Kolpatzeck

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include—among others—imaging, material characterization, and layer thickness measurements. While THz-TDS has achieved significant success in research environments, the high cost and bulky nature of most systems have hindered widespread commercialization of this technology. Two primary factors contributing to the size and cost of these systems are the laser and the optical delay unit (ODU). Consequently, our group has focused on developing THz-TDS systems based on compact monolithic mode-locked laser diodes (MLLDs). The ultra-high repetition rate (UHRR) of the MLLD has the added benefit that it allows us to utilize shorter ODUs, thereby reducing the overall cost and size of our systems. However, achieving the necessary precision in the ODU to acquire accurate terahertz time-domain signals remains a crucial aspect. To address this issue, we have developed and enhanced an interferometric extension for UHRR-THz-TDS systems. This extension is inexpensive, compact, and easy to incorporate. In this article, we present the system setup, the extension itself, and the algorithmic procedure for reconstructing the delay axis based on the interferometric reference signal. We evaluate a dataset comprising 10,000 signal traces and report a standard deviation of the measured terahertz phase at 1.6 THz as low as 3 mrad. Additionally, we demonstrate a remaining peak-to-peak jitter of only 20 fs and a record-high peak signal-to-noise ratio of 133 dB at 100 GHz after averaging. The method presented in this paper allows for simplified THz-TDS system builds, reducing bulk and cost. As a result, it further facilitates the transition of terahertz technologies from laboratory to field applications.

show abstract