13 citations · 20 across the 5 of their papers we have counts for
5 papers
Scalable fabrication of erbium-doped high-Q silica microtoroid resonators via sol-gel coating
Riku Imamura, Shun Fujii, Keigo Nagashima +1
This study explores sol-gel methods for fabricating erbium-doped silica microtoroid resonators, addressing the limitations of conventional doping techniques and enhancing device sc…
Exceptional point proximity-driven mode-locking in coupled microresonators
Riku Imamura, Shun Fujii, Ayata Nakashima +1
We show theoretically and numerically that mode-locking is feasible with a coupled-cavity system with gain and loss, notably, without any natural saturable absorber. We highlight t…
Deterministic generation of a perfect soliton crystal with a saturable absorber
Ayata Nakashima, Shun Fujii, Riku Imamura +2
We numerically investigate the deterministic generation of a perfect soliton crystal (PSC) in an optical microresonator functionalized with a saturable absorber (SA). The SA allows…
Design of a passively mode-locking whispering gallery mode microaser
Tomoki S. L. Prugger Suzuki, Ayata Nakashima, Keigo Nagashima +6
Ultrahigh repetition rate lasers will become vital light sources for many future technologies; however, their realization is challenging because the cavity size must be minimized.…
Coupling of a whispering gallery mode to a silicon chip with photonic crystal
Yuyang Zhuang, Hajime Kumazaki, Shun Fujii +5
We demonstrate the efficient coupling (99.5%) of a silica whispering gallery mode microresonator directly with a silicon chip by using a silicon photonic crystal waveguide as a cou…