15 March 2023
Society of Photo-Optical Instrumentation Engineers (SPIE)

Red laser diodes explore the future of biomedical and quantum technology


Masato Hagimoto,1 Shintaro Miyamoto,1 Kyohei Watanabe,1 Manabu Hashizume,1 Kazuaki Yano1

1Ushio Inc. (Japan)


In recent years, longer wavelengths red laser diodes (LDs) have attracted attention in the biomedical and quantum technology fields. In light-based cancer therapies such as photodynamic therapy (PDT) and near-infrared photoimmunotherapy (NIR-PIT), and in skin care, high-power red LDs are required. We have demonstrated highly reliable 1.2 W multi-mode LDs with the wavelength of 630, 635, 652, 659, 665, 675, 683, and 690 nm. These multi-mode LDs are suitable for fiber coupling because of their small emitter size of 80μm, and high-power and high reliability make them ideal light sources for biomedical applications. In addition, high-power single-mode LDs are desired for optical lattice clocks and laser cooling. We have demonstrated AlGaInP-based 200 mW single-mode LDs with the wavelength of 690, 700, and 705 nm. These single-mode LDs wavelength can be adjusted for the specific value by controlling temperature, which makes them ideal light sources for quantum technology.  


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