High efficient MLD-THz-TDS systems using laser chaos and super focusing with metal V-grooved waveguide

Kuwashima, Fumiyoshi; Shirao, Takuya; Kishibata, Toshihiro; Akamine, Yusuke; Iwao, Noriyuki; Ooi, Motoki; Sakaue, Naoya; Sirasaki, Takurou; Gouda, Siori; Tani, Masahiko; Kurihara, Kazuyoshi; Yamamoto, Kohji; Nagashima, Takeshi; Nakajima, Makoto; Hangyo, Masanori

doi:10.1109/irmmw-thz.2016.7758835

Cited by 2 publications

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“…The situation is different for the case of detecting optical beat signals. A typical example is THz time-domain spectroscopy (THz-TDS) with a multimode laser as an input light source [ 16 , 17 , 18 , 19 ]. In this case, the THz-TDS output strongly depends on the degree of temporal synchronization of the light components among the multiple modes.…”

Section: Introductionmentioning

confidence: 99%

The Degree of Temporal Synchronization of the Pulse Oscillations from a Gain-Switched Multimode Semiconductor Laser

2017

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Langevin noise leads to inhibition of the temporal synchronization of the pulse oscillations from a gain-switched multimode semiconductor laser, resulting in the power reduction in optical beat detection. In this paper, the degree of the temporal synchronization of the pulse oscillations was examined by numerically estimating the output energy in THz time-domain spectroscopy (THz-TDS) using multimode semiconductor laser rate equations that include Langevin noise. The degree was estimated to be 95.5% from the ratio of the averaged THz-TDS output energy for the case where Langevin noise was included to that for when Langevin noise was excluded. Therefore, a gain-switched multimode semiconductor laser can be regarded as equivalent to optical pulses oscillating simultaneously in all modes in actual applications including optical beat detection.

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