The combination of a high-Q optical microcavity and a saturable absorber is expected to enable mode locking between different transverse modes in a microcavity. This work studies saturable absorption in carbon nanotubes (CNTs) on microtoroids. The CNTs are selectively grown on silica microtoroids by chemical vapor deposition after the cobalt catalysis is selectively deposited on the surface. A Raman spectrum measurement showed that the grown CNTs are about 1.0 nm in diameter, and that the device is applicable for use in the 1550 nm band. The saturable absorption by CNTs is investigated with a counter-propagating pump-probe experiment.
Tsutaru Kumagai, Naoya Hirota, Katsuya Sato, Koki Namiki, Atsuhiro Hori, Hideyuki Maki, and Takasumi Tanabe, "Saturable absorption by carbon nanotubes on silica microtoroids for stable mode locking," Proc. SPIE 10518, Laser Resonators, Microresonators, and Beam Control XX, 105180H (Presented at SPIE LASE: January 30, 2018; Published: 16 February 2018); https://doi.org/10.1117/12.2291874.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon