Yean-Sheng Yong
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View article: Study on multiple waveguide platforms for waveguide integrated Raman spectroscopy
Study on multiple waveguide platforms for waveguide integrated Raman spectroscopy Open
Waveguide Raman spectroscopy uses the evanescent field outside a waveguide to probe the analyte on the surface of the chip, permitting to selectively study thin films or nanostructures on top of the waveguide while benefiting from the long…
View article: Energy-transfer upconversion and excited-state absorption in KGd<sub>x</sub>Lu<sub>y</sub>Er<sub>1-x-y</sub>(WO<sub>4</sub>)<sub>2</sub> waveguide amplifiers
Energy-transfer upconversion and excited-state absorption in KGd<sub>x</sub>Lu<sub>y</sub>Er<sub>1-x-y</sub>(WO<sub>4</sub>)<sub>2</sub> waveguide amplifiers Open
We perform a systematic spectroscopic study in channel waveguides of potassium gadolinium lutetium double tungstate doped with different Er3+ concentrations. Transition cross sections of ground-state absorption (GSA) and excited-state abso…
View article: Monolithic Integration of Al<sub>2</sub>O<sub>3</sub> and Si<sub>3</sub>N<sub>4</sub> Toward Double-Layer Active–Passive Platform
Monolithic Integration of Al<sub>2</sub>O<sub>3</sub> and Si<sub>3</sub>N<sub>4</sub> Toward Double-Layer Active–Passive Platform Open
Low-cost, high-performance integration technologies are instrumental for active-passive integrated photonics devices. The monolithic integration of Al2O3 and Si3N4 is studied, enabling to combine the promising optical features of Si3N4 wit…
View article: Gain dynamics in a highly ytterbium-doped potassium double tungstate thin-film amplifier
Gain dynamics in a highly ytterbium-doped potassium double tungstate thin-film amplifier Open
Active media with high rare-earth concentrations are essential for small-footprint waveguide amplifiers. When operating at high population inversion, such devices are often affected by undesired energy-transfer processes and thermal effect…
View article: Gain dynamics in a highly ytterbium-doped potassium double tungstate epitaxial layer
Gain dynamics in a highly ytterbium-doped potassium double tungstate epitaxial layer Open
Active media with high rare-earth concentrations are essential for small-footprint waveguide amplifiers. When operating at high population inversion, such devices are often affected by undesired energy-transfer processes and thermal effect…
View article: High optical gain in erbium-doped potassium double tungstate channel waveguide amplifiers
High optical gain in erbium-doped potassium double tungstate channel waveguide amplifiers Open
We report on the optical-gain properties of channel waveguides patterned into lattice-matched KGdxLuyEr1-x-y(WO4)2 layers grown onto undoped KY(WO4)2 substrates by liquid phase epitaxy. A systematic investigation of gain is performed for f…
View article: Low-loss, broadband and high fabrication tolerant vertically tapered optical couplers for monolithic integration of Si_3N_4 and polymer waveguides
Low-loss, broadband and high fabrication tolerant vertically tapered optical couplers for monolithic integration of Si_3N_4 and polymer waveguides Open
A low-loss, broadband and high fabrication tolerant optical coupler for the monolithic integration of Si3N4 and polymer waveguides is designed and experimentally demonstrated. The coupler is based on the adiabatic vertical tapering of the …
View article: High gain in erbium-doped channel waveguides
High gain in erbium-doped channel waveguides Open
Integration of multiple functions on an optical micro-chip is going to revolutionize the exploitation of optics for various applications such as communication, optical sensing, and biomedicine. One of the enabling functions is amplificatio…
View article: Temperature dependence of transition cross sections in rare-earth-doped laser materials
Temperature dependence of transition cross sections in rare-earth-doped laser materials Open
Summary form only given. The transition cross sections on the pump and laser wavelength of rare-earth-doped materials are of crucial importance for their performance as amplifiers and lasers and for the understanding of their performance i…
View article: Potassium double tungstate waveguides with high ytterbium concentration for optical amplification
Potassium double tungstate waveguides with high ytterbium concentration for optical amplification Open
In this thesis, the research work concerning high ytterbium concentration potassium double tungstate waveguides catered for optical amplification purpose is presented. The scope of the research work includes the investigation of spectrosco…
View article: Temperature-dependent absorption and gain of ytterbium-doped potassium double tungstates for chip-scale amplifiers and lasers
Temperature-dependent absorption and gain of ytterbium-doped potassium double tungstates for chip-scale amplifiers and lasers Open
Ytterbium-doped potassium rare-earth double tungstate thin films are excellent candidates for highly efficient waveguide lasers, as well as high-gain waveguide amplifiers, with a record-high optical gain per unit length of 935 dB/cm recent…
View article: Spectroscopy of erbium-doped potassium double tungstate waveguides
Spectroscopy of erbium-doped potassium double tungstate waveguides Open
We report the spectroscopy of crystalline waveguide amplifiers operating in the telecom C-band. Thin films of erbiumdoped gadolinium lutetium potassium double tungstate, KGdxLuyEr1-x-y (WO4)2, are grown by liquid-phase epitaxy onto undoped…
View article: Direct confocal lifetime measurements on rare-earth-doped media exhibiting radiation trapping
Direct confocal lifetime measurements on rare-earth-doped media exhibiting radiation trapping Open
Radiation trapping occurs in rare-earth-doped active media with strong spectral overlap of luminescence and ground-state absorption. It is demonstrated experimentally that a confocal measurement mitigates the influence of radiation trappin…
View article: Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content
Temperature-dependent absorption and emission of potassium double tungstates with high ytterbium content Open
We study the spectroscopic properties of thin films of potassium ytterbium gadolinium double tungstates, KYb0.57Gd0.43(WO4)2, and potassium ytterbium lutetium double tungstates, KYb0.76Lu0.24(WO4)2, specifically at the central absorption l…
View article: Low-Loss Highly Tolerant Flip-Chip Couplers for Hybrid Integration of Si<sub>3</sub>N<sub>4</sub> and Polymer Waveguides
Low-Loss Highly Tolerant Flip-Chip Couplers for Hybrid Integration of Si<sub>3</sub>N<sub>4</sub> and Polymer Waveguides Open
In this letter, low-loss and highly fabrication-tolerant flip-chip bonded vertical couplers under single-mode condition are demonstrated for the integration of a polymer waveguide chip onto the Si3N4/SiO2 passive platform. The passively al…
View article: A Low-Loss and Broadband MMI-Based Multi/Demultiplexer in Si<sub>3</sub>N<sub>4</sub>/SiO<sub>2</sub>Technology
A Low-Loss and Broadband MMI-Based Multi/Demultiplexer in Si<sub>3</sub>N<sub>4</sub>/SiO<sub>2</sub>Technology Open
A low-loss and broadband multimode interference (MMI)-based wavelength multi/demultiplexer in Si3N4/SiO2 technology for erbium-doped lasing and amplifying applications is presented. The structural parameters of a 2 × 1 Si3N4 MMI multi/demu…