Asynchronous sampling terahertz time‐domain spectroscopy using semiconductor lasers

Döpke, Benjamin; Surkamp, Nils; Hu, Yuze; Brenner, Carsten; Klehr, A.; Knigge, Andrea; Tränkle, G.; Hofmann, Martin R.

doi:10.1049/el.2018.0521

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…A standard TDS system includes a mechanical delay line, introducing complexity as well as reducing the sampling speed. Both may be overcome by implementing alternative sampling concepts, for example, asynchronous optical sampling (ASOPS) [39], [40], [41], [42]. The idea of ASOPS is to operate two separate mode-locked laser diodes (MLLDs) for gating transmitter and receiver.…”

Section: ) Time Domain Spectroscopy Systemsmentioning

confidence: 99%

Terahertz Sources and Receivers: From the Past to the Future

Makhlouf¹,

Cojocari

Hofmann³

et al. 2023

IEEE J. Microw.

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The rapid progress in semiconductor technology has vastly boosted the development of terahertz sources and receivers in terms of compactness, reliability, operation frequency, and output power. In this manuscript, we report on the latest achievements in terahertz sources and receivers and provide a comprehensive overview of their working principles and applications in THz systems. INDEX TERMS THz technologies, THz photodiodes, THz photoconductors, THz semiconductor laser diodes, THz quantum cascade lasers, THz heterojunction bipolar transistors, THz high electron mobility transistor, THz resonant tunneling diodes, THz Schottky barrier detectors and mixers. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ SUMER MAKHLOUF received the master's degree in communications engineering from the University of Duisburg-Essen, Duisburg, Germany, in 2018. He is currently working toward the Ph.D. degree in monolithically integrated THz photodiodes with rectangular waveguide outputs for coherent THz receivers. He is currently a Member of the Optoelectronics Department, Center for Semiconductor Technology and Optoelectronics (ZHO) and Research Associate with the University of Duisburg-Essen. Recently, he has been a Senior Engineer with Microwave Photonics GmbH, Oberhausen, Germany, working on developing RF modules for space communications and photonic integrated circuits for ultra-low phase noise THz systems.

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Section: ) Time Domain Spectroscopy Systemsmentioning

confidence: 99%

Terahertz Sources and Receivers: From the Past to the Future

Makhlouf¹,

Cojocari

Hofmann³

et al. 2023

IEEE J. Microw.

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“…Quantum Dot (QD) and Quantum Well (QW) mode-locked semiconductor lasers are a small and cost-effective solution for various applications, including communication, optical comb generation and sensor technology as well as in pump-and probe measurement techniques such as Terahertz Time Domain Spectroscopy. [1][2][3][4] Different methods of mode-locking lead to the generation of ultrashort pulse widths of a few hundred femtoseconds. 5 Passive mode-locking (PML) requires to implement a saturable absorber into the setup.…”

Section: Introductionmentioning

confidence: 99%

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Kleemann,

Surkamp,

Scherer

et al. 2024

Novel in-Plane Semiconductor Lasers XXIII

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In this study, we conduct a comparative analysis of an InAs/InP quantum dot diode laser and an InGaAsP/InP quantum well laser. Both lasers are monolithic, 840 µm long devices. They have a two-part buried heterostructure with 10%/90% reflection coated facets and emit at 1550 nm (quantum dot laser) respectively 1570 nm (quantum well laser). In passive mode-locking operational mode, the larger section of both devices is continuously pumped with forward current, while the second, smaller section (50 µm) is operated with reverse absorber voltage. In self mode-locking operation both sections of the laser are connected and pumped with forward current. Femtosecond pulses have been detected in both operational modes.

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“…Proof-of-principle demonstrations have shown the feasibility of integrating diode lasers into asynchronous sampling THz-TDS systems [4,5]. The generated pulses from utilized lasers, realized either with an external cavity or monolithically, are shown to be compressible into subpicosecond range.…”

mentioning

confidence: 99%

Picosecond pulses with 40 W peak power from a passively mode‐locked tapered quantum well laser

Wohlfeil

Christopher

Fricke

et al. 2023

Electronics Letters

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In this letter, the authors present a monolithic edge emitting diode laser intended as a potential key component for the generation of terahertz radiation in a compact time‐domain spectroscopy system. The 6 mm long multi‐section InGaAsP double quantum well (DQW) laser, featured with a 3.6 mm long tapered (TP) gain section, operates at a wavelength of ∼832 nm and generates pulses at a fundamental repetition rate of ∼6.3 GHz in passive mode‐locking operation. Pulses with 2.6 ps width and 40 W peak power are measured. The generated pulses are not bandwidth‐limited and should be compressible for further applications.

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Asynchronous sampling terahertz time‐domain spectroscopy using semiconductor lasers

Cited by 7 publications

References 12 publications

Terahertz Sources and Receivers: From the Past to the Future

Terahertz Sources and Receivers: From the Past to the Future

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Picosecond pulses with 40 W peak power from a passively mode‐locked tapered quantum well laser

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