Repetition frequency tunability and stability of BH InAs/InP QD and InGaAsP/InP QW two-section mode-locked laser diodes

Cherniak, Vladyslav; Zander, Marlene; Moehrle, Martin G.; Rehbein, W.; Balzer, Jan C.

doi:10.1364/oe.468031

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…42 . In a previously published work 43 we have investigated the stability of these MLLDs at different points of operations. Based on this work, we operate the MLLDs at optimal points of operation with respect to their repetition rate stability.…”

Section: Methodsmentioning

confidence: 99%

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

Self Cite

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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 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.

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Section: Methodsmentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The MLLDs used in this work are InAs/InP QD and InGaAsP/InP QW introduced by Zander et al 41 . In a previously published work 42 we have investigated the stability of these MLLDs at different points of operations. Based on this work, we operate the MLLDs at optimal points of operation with respect to their repetition rate stability.…”

Section: Laser Diodesmentioning

confidence: 99%

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

Cherniak

Kubiczek

Kolpatzeck

et al. 2023

Preprint

Self Cite

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 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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Terahertz Reflection Vibrometry for Analyzing Metal Foil Displacement induced by Single Cavitation Bubble Collapse

Cherniak,

Sagar,

Moctar

et al. 2023

2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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Repetition frequency tunability and stability of BH InAs/InP QD and InGaAsP/InP QW two-section mode-locked laser diodes

Cited by 4 publications

References 29 publications

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

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

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

Terahertz Reflection Vibrometry for Analyzing Metal Foil Displacement induced by Single Cavitation Bubble Collapse

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