Optimal Conditions for a Multimode Laser Diode with Delayed Optical Feedback in Terahertz Time-Domain Spectroscopy

Kenji Wada; Tokihiro Kitagawa; Tetsuya Matsuyama; Koichi Okamoto; Fumiyoshi Kuwashima

doi:10.20944/preprints202307.1700.v1

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preprints.org > physical sciences > optics and photonics > doi: 10.20944/preprints202307.1700.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Optimal Conditions for a Multimode Laser Diode with Delayed Optical Feedback in Terahertz Time-Domain Spectroscopy

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Version 1 : Received: 24 July 2023 / Approved: 25 July 2023 / Online: 25 July 2023 (10:57:27 CEST)

A peer-reviewed article of this Preprint also exists.

Wada, K.; Kitagawa, T.; Matsuyama, T.; Okamoto, K.; Kuwashima, F. Optimal Conditions for a Multimode Laser Diode with Delayed Optical Feedback in Terahertz Time-Domain Spectroscopy. Spectrosc. J. 2023, 1, 137-151. Wada, K.; Kitagawa, T.; Matsuyama, T.; Okamoto, K.; Kuwashima, F. Optimal Conditions for a Multimode Laser Diode with Delayed Optical Feedback in Terahertz Time-Domain Spectroscopy. Spectrosc. J. 2023, 1, 137-151.

Abstract

Recent studies have indicated that terahertz time-domain spectroscopy (THz-TDS) can stably and efficiently acquire output spectra using an affordable and compact multimode laser diode (MMLD) with delayed optical feedback as the light source. This research focused on a numerical analysis of the optimal conditions for employing an MMLD with delayed optical feedback (chaotic oscillating laser diode) in THz-TDS, utilizing multimode rate equations. The findings revealed that the intermittent chaotic output generated by the MMLD, characterized by concurrent picosecond pulse oscillations lasting several tens of picoseconds, proves to be highly effective for THz-TDS. By appropriately setting the amounts of injection current and optical feedback, and the delay time of optical feedback, intermittent chaotic oscillation can be attained within a considerably broad parameter range. Moreover, both the MMLD output spectrum and the THz-TDS output spectrum exhibit a consistently stable shape at the microsecond scale, demonstrating the attractor properties inherent in an MMLD with delayed optical feedback.

Keywords

terahertz time-domain spectroscopy; multimode laser diode; delayed optical feedback; laser chaos; intermittent chaos; picosecond optical pulse generation; concurrent pulse oscillation; multimode rate equations

Subject

Physical Sciences, Optics and Photonics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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