First Direct Observation of Small Linewidth Enhancement Factor of Fabry–Perot Quantum Cascade Laser

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概要

• 論文の詳細を見る

• We investigated the linewidth enhancement factor $\alpha$ of a Fabry–Perot quantum cascade laser by self-mixing interferometry. For the first time, the theoretically predicted characteristic waveform resulting from a small $\alpha$ of about $-0.3$ could be obtained when the optical feedback parameter was greater than one. The shape of this waveform was totally different from that of a conventional distributed-feedback laser diode with a large $\alpha$. We demonstrated that subband nonparabolicity is one of the reasons why quantum cascade lasers have a small, but non-zero, $\alpha$ value.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2008-03-25

著者

• Kasahara Kenichi

  Department Of Photonics Faculty Of Science And Engineering Ritsumeikan University

• Edamura Tadataka

  Central Research Laboratories Hamamatsu Photonics K.k.

• Kasahara Kenichi

  Department of Photonics, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Kumazaki Naoki

  Department of Photonics, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Takagi Yohei

  Department of Photonics, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Ishihara Mikito

  Department of Photonics, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Akikusa Naota

  Central Research Laboratory, Hamamatsu Photonics K.K., Hamakita, Shizuoka 434-8601, Japan

• Edamura Tadataka

  Central Research Laboratory, Hamamatsu Photonics K.K., Hamakita, Shizuoka 434-8601, Japan

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