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Systematic characterization of a 1550 nm microelectromechanical (MEMS)-tunable vertical-cavity surface-emitting laser (VCSEL) with 7.92 THz tuning range for terahertz photomixing systems

Haidar, Mohammad Tanvir and Preu, Sascha and Cesar, Julijan and Paul, Sujoy and Hajo, Ahid S. and Neumeyr, Christian and Maune, Holger and Küppers, Franko (2021):
Systematic characterization of a 1550 nm microelectromechanical (MEMS)-tunable vertical-cavity surface-emitting laser (VCSEL) with 7.92 THz tuning range for terahertz photomixing systems. (Publisher's Version)
In: Journal of Applied Physics, 123 (2), pp. 1-9. American Institute of Physics (AIP), ISSN 0021-8979, e-ISSN 1089-7550,
DOI: 10.26083/tuprints-00017607,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Systematic characterization of a 1550 nm microelectromechanical (MEMS)-tunable vertical-cavity surface-emitting laser (VCSEL) with 7.92 THz tuning range for terahertz photomixing systems
Language: English
Abstract:

Continuous-wave (CW) terahertz (THz) photomixing requires compact, widely tunable, mode-hop-free driving lasers. We present a single-mode microelectromechanical system (MEMS)-tunable vertical-cavity surface-emitting laser (VCSEL) featuring an electrothermal tuning range of 64 nm (7.92 THz) that exceeds the tuning range of commercially available distributed-feedback laser (DFB) diodes (∼4.8 nm) by a factor of about 13. We first review the underlying theory and perform a systematic characterization of the MEMS-VCSEL, with particular focus on the parameters relevant for THz photomixing. These parameters include mode-hop-free CW tuning with a side-mode-suppression-ratio >50 dB, a linewidth as narrow as 46.1 MHz, and wavelength and polarization stability. We conclude with a demonstration of a CW THz photomixing setup by subjecting the MEMS-VCSEL to optical beating with a DFB diode driving commercial photomixers. The achievable THz bandwidth is limited only by the employed photomixers. Once improved photomixers become available, electrothermally actuated MEMS-VCSELs should allow for a tuning range covering almost the whole THz domain with a single system.

Journal or Publication Title: Journal of Applied Physics
Journal volume: 123
Number: 2
Publisher: American Institute of Physics (AIP)
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics > Microwave Engineering
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics > Photonics and Optical Communications
Date Deposited: 06 Apr 2021 11:58
Last Modified: 06 Apr 2021 11:58
DOI: 10.26083/tuprints-00017607
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-176071
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/17607
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