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3,316 results on '"Qiu, Jianrong"'

244. Highly Efficient O-Band Rectangular Pulse Emission in a Figure-of-Nine Bismuth-Doped Fiber Laser

Author

Lau, Kuen Yao, Firstov, Sergei, Cui, Yudong, Liu, Xiaofeng, Afanasiev, Fedor, and Qiu, Jianrong

Abstract

Highly efficient rectangular pulse emission is significant in high energy O-band applications due to the zero dispersion of standard telecom optical fiber in the second telecommunication window. The rectangular pulse emission offers the peak power clamping, which avoids wave-breaking and maintains the fundamental repetition frequency with arbitrarily widened temporal pulse width of ultrafast laser at high pump powers. The current technology in the O-band rectangular pulse emission achieves the maximum pulse energy of ∼30 nJ with an efficiency of ∼1.06%. Here, we fabricated a single-mode bismuth-doped phosphosilicate optical fiber by the modified chemical vapour deposition technique. The Bi-doped phosphosilicate optical fiber was characterized by a peak absorption of ∼0.6 dB/m at 1250 nm and a high gain coefficient of ∼0.22 dB/m at 1320 nm. These parameters contribute to the generation of rectangular pulse with a pump power threshold of ∼227.7 mW in a figure-of-nine laser cavity. The maximum pulse energy was achieved as ∼197.7 nJ, whereas the laser efficiency is ∼14.3%. We presented an O-band rectangular pulse emission with the highest pulse energy and efficiency as compared to previous studies, whilst its all-fiber laser setup is robust and feasible for high pulse energy applications.

Published
2023
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245. Toward 3D Integration of Highly See‐Through Photonic Circuits in Glass.

Author

Zhong, Lijing, Wang, Yuying, Tan, Dezhi, and Qiu, Jianrong

Subjects
FEMTOSECOND lasers, OPTICAL elements, MONOCHROMATIC light, OPTICAL waveguides, GLASS, THERMODYNAMIC control, PLANAR waveguides
Abstract

Embedding naked‐eye‐invisible electronic and optical elements in transparent panels is at the heart of enabling mobile transparent accessories by making see‐through smart screens. Here, a novel invisible photonic element, highly see‐through (HST) waveguide, is reported, which is written by femtosecond laser in glass. A general synergistic control of the thermodynamic and dynamic behavior over the matter fluid in the laser irradiated confined region to tune the cross‐section of waveguides and suppress the generation of scattering centers in the waveguides is established. An effective reduction of light leakage (covering red, green, and blue coupled light) by an order of magnitude compared to conventional waveguides is achieved, making it highly see‐through at bright illumination of >100 lux. A general dynamical model based on a frozen‐in shock wave diffusion process is proposed, which is applicable to various glasses regardless of their compositions. Ultra‐wide tuning of HST waveguide mode diameters from 4.9 to 26.5 µm is demonstrated, making it versatile for functionalizing various transparent screens by mode‐matching with fiber sources and integrated planar waveguides of different working wavelengths. [ABSTRACT FROM AUTHOR]

Published
2023
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