Tunable external cavity laser diode based on wavelength controlled self-assembled InAs quantum dots for swept-source optical coherence tomography applications at 1100 nm wavelength band

Nobuhiko Ozaki; David Childs; Aleksandr Boldin; Daigo Ikuno; Katsuya Onoue; Hirotaka Ohsato; Eiichiro Watanabe; Naoki Ikeda; Yoshimasa Sugimoto; Richard Hogg

doi:10.1117/12.2509984

1 March 2019 Tunable external cavity laser diode based on wavelength controlled self-assembled InAs quantum dots for swept-source optical coherence tomography applications at 1100 nm wavelength band

Nobuhiko Ozaki, David Childs, Aleksandr Boldin, Daigo Ikuno, Katsuya Onoue, Hirotaka Ohsato, Eiichiro Watanabe, Naoki Ikeda, Yoshimasa Sugimoto, Richard Hogg

Author Affiliations +

Proceedings Volume 10939, Novel In-Plane Semiconductor Lasers XVIII; 1093911 (2019) https://doi.org/10.1117/12.2509984
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

We fabricated and characterized a grating-coupled external cavity laser with gain chips including self-assembled InAs quantum dots (QDs) for swept-source optical coherence tomography applications. By controlling the emission wavelength of the self-assembled InAs QDs, tunable lasing at a wavelength band of 1–1.1 μm was obtained, which represents an optimal balance between absorption and scattering in biological tissues. Straight and J-shaped edgeemitting ridge waveguides (RWGs) were fabricated on a GaAs-based waveguide layer containing four InAs QDs layers. A diffraction grating with the quasi-Littrow configuration was employed as an external cavity for the fiber-coupled diodes. Electroluminescence spectra from the QD-based diodes revealed that broadband amplified spontaneous emissions appeared in a J-shaped RWG, whereas Fabry–Perot lasing occurred in the straight RWG. The external cavity was then introduced for the diode with a J-shaped RWG, and a tuning range of 65 nm centered at approximately 1100 nm was obtained from the QD gain chip with the J-shaped RWG.

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Nobuhiko Ozaki, David Childs, Aleksandr Boldin, Daigo Ikuno, Katsuya Onoue, Hirotaka Ohsato, Eiichiro Watanabe, Naoki Ikeda, Yoshimasa Sugimoto, and Richard Hogg "Tunable external cavity laser diode based on wavelength controlled self-assembled InAs quantum dots for swept-source optical coherence tomography applications at 1100 nm wavelength band", Proc. SPIE 10939, Novel In-Plane Semiconductor Lasers XVIII, 1093911 (1 March 2019); https://doi.org/10.1117/12.2509984

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