Asynchronous optical sampling THz spectroscopy system based on monolithically modelocked laser diodes
Final Report Abstract
The project goal was to develop a compact, powerful THz-TDS-System (Terahertz-Time domain spectroscopy) with new sampling concepts on the basis of monolithic hybrid modelocked laser diodes. For that purpose, partner FBH developed multi-section laser diodes with variable geometries (e.g. variable absorber lengths). The integration of a tapered gain section within a for power boosting has been comprehensively experimentally and theoretically investigated. The tapered laser can generate optical pulses with a duration of 3 ps and a peak power of approximately 40 W. The pulses are chirped, making them suitable for subsequent compression. By integrating an S-bend waveguide, a detuning of the repetition rate by about 10 MHz is achieved. Partner EST developed successfully the driving electronics for the hybrid modelocking. It enables stable hybrid modelocking with low temporal jitter and tunability of the repetition rate by up to 30 MHz, the latter being crucial for the envisioned asynchronous sampling concepts. Partner PTT was responsible for the laser characterization and the system development. The laser diodes with short (100 µm) absorber segment delivered too low bandwidths for THz applications. The later available laser diodes with 200 µm long absorbers in contrast delivered broad spectral bandwidth with strongly chirped pulses. These laser diodes thus delivered sufficient specifications for reaching the project goals. However, the system development proved to be challenging. In this respect, the project partners only jointly defined the final design of the system at a late stage of the project. The lasers required for this were realized, but could no longer be made available within the regular project duration. A continuation of the work has been agreed between the partners.
Link to the final report
https://doi.org/10.34657/27647
Publications
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A Fixed-Frequency, Tunable Dielectric Resonator Oscillator With Phase-Locked Loop Stabilization. 2022 Asia-Pacific Microwave Conference (APMC), 728-730. IEEE.
Kaesbach, Robin; Van Delden, Marcel & Musch, Thomas
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"Picosecond pulses with 40 W peak power from a mode-locked tapered laser diode emitting at 830 nm." Workshop Nonlinear Dynamics in Semiconductor Lasers (NDSL) 2023.
Wohlfeil, Shulin
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A Tunable Dielectric Resonator Oscillator with Phase-Locked Loop Stabilization for THz Time Domain Spectroscopy Systems. IEICE Transactions on Electronics, E106.C(11), 718-721.
Kaesbach, Robin; Van Delden, Marcel & Musch, Thomas
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Generation of Picosecond Pulses from Tapered Laser Diodes with over 40 W Peak Power at Wavelengths of 780 nm and 830 nm. 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 1-1. IEEE.
Wohlfeil, Shulin; Christopher, Heike; Fricke, Jörg; Casa, Pietro Della; Maaßdorf, Andre; Wenzel, Hans; Knigge, Andrea & Tränkle, Günther
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Picosecond pulses with 40 W peak power from a passively mode‐locked tapered quantum well laser. Electronics Letters, 59(4).
Wohlfeil, Shulin; Christopher, Heike; Fricke, Jörg; Wenzel, Hans; Knigge, Andrea & Tränkle, Günther
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Characterization of Monolithic Mode- Locked Ridge Waveguide Laser Diodes for THz ASOPS Application. 2024 IEEE Asia-Pacific Microwave Conference (APMC), 808-810. IEEE.
Kreuzer, Lisa C.; Starsaja, Annamarija; Kaesbach, Robin; Wohlfeil, Shulin; Surkamp, Nils; Schulz, Niklas; van Delden, Marcel; Brenner, Carsten; Wenzel, Hans; Musch, Thomas; Knigge, Andrea & Hofmann, Martin R.
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Spatio-temporal modeling and simulation of a mode-locked tapered semiconductor diode laser. New Journal of Physics, 27(1), 013011.
Wohlfeil, Shulin; Koester, Jan-Philipp; Wenzel, Hans & Knigge, Andrea
