Dr. Jianfeng Wu Profile

Dr. Jianfeng Wu

Optical Engineer at NP Photonics Inc

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Publications (6)

Proceedings Article | 8 February 2011 Paper

Conceptual study of a fiber-optical approach to solid-state laser cooling

Dan Nguyen, Christopher Shanor, Jie Zong, Wenyan Tian, Zhidong Yao, Jianfeng Wu, Jeff Weiss, Rolf Binder, Arturo Chavez-Pirson

Proceedings Volume 7951, 795109 (2011) https://doi.org/10.1117/12.876225

KEYWORDS: Fiber lasers, Glasses, Thulium, Absorption, Optical cooling, Ions, Crystals, Luminescence, Cooling systems, Metals

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Proceedings Article | 19 February 2009 Paper

Single-frequency fiber laser at 2.05 um based on Ho-doped germanate glass fiber

Jianfeng Wu, Zhidong Yao, Jie Zong, Arturo Chavez-Pirson, Nasser Peyghambarian, Jirong Yu

Proceedings Volume 7195, 71951K (2009) https://doi.org/10.1117/12.809482

KEYWORDS: Fiber lasers, Glasses, Absorption, Semiconductor lasers, Ions, Fiber Bragg gratings, Luminescence, Holmium, Doping, Laser stabilization

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Proceedings Article | 30 August 2005 Paper

Lanthanide nanoparticle doped low-loss sol-gel amplifier materials

Haiyong Gan, Robert Norwood, Li Li, Christopher DeRose, Jianfeng Wu, Jayan Thomas, M. Amir Fardad, Axel Schuelzgen, Nasser Peyghambarian, Channa De Silva, Zhiping Zheng

Proceedings Volume 5935, 59350D (2005) https://doi.org/10.1117/12.619565

KEYWORDS: Erbium, Nanoparticles, Sol-gels, Ions, Lanthanum, Refractive index, Waveguides, Polymers, Absorption, Optical amplifiers

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Organic-inorganic hybrid sol-gel materials have attracted increasing attention in recent years as low-cost, rugged materials for integrated optical devices such as optical couplers, splitters, and electro-optic modulators. These materials can be easily processed by spin-coating, wet-etching photolithography, and low-temperature baking. Precise control of waveguide core-cladding refractive indices produces well-confined low-loss propagation and good matching of the absolute refractive index to that of fused silica results in low optical coupling loss to optical fiber. The increased thermal and mechanical stability of these materials, relative to optical polymers, results in numerous packaging options and improved reliability. However organic-inorganic hybrid sol-gel materials have not yet been often used as host of active dopants such as erbium (III) ions for 1550nm optical amplification. This limitation owes primarily to matrix and chelate dominated nonradiative relaxation processes, as high phonon energy OH and OH-like oscillators can bridge off the energy from the excited erbium (III) ions at very high rates. Different strategies have been proposed to protect erbium (III) ions from matrix and chelate quenching, including host and ligand fluorination, and inorganic microstructure shielding. Here we report on our work of encapsulating erbium (III) ions in transparent, refractive index matched, and highly re-dispersible lanthanum phosphate nanoparticles and the work of examining the optical properties of these nanoparticles as active dopants in organic-inorganic hybrid sol-gels adopting 2-methacryloxypropyl trimethoxysilane (MAPTMS) as a precursor. 980nm laser pumped photoluminescence at 1535nm was obtained from solid bulk samples of 300mg La.₉₉Er.₀₁PO₄ nanoparticles doped in 1mL hybrid sol-gel. Thick bulk samples of this composition exhibited exceptional clarity and little trace of nanoparticle scattering effects. The lifetime of the nanoparticle doped hybrid sol-gel composite was measured to be 220μs, indicating an intermediate relaxation rate between that of an erbium organic complex and annealed erbium doped glass. La.₉₉Er.₀₁PO₄ nanoparticle doped hybrid sol-gel films were also prepared and the refractive index was measured to be 1.4966 at 1550nm, which is very close to that of optical fiber and provides a suitable index difference from an undoped and metal oxide tuned sol-gel at 1.4870 to comprise an efficient single-mode waveguide system.

Proceedings Article | 4 April 2005 Paper

Tm3+ doped tellurite glass microsphere laser

Jianfeng Wu, Shibin Jiang, Tiequn Qiu, Michael Morrell, Axel Schulzgen, Nasser Peyghambarian

Proceedings Volume 5723, (2005) https://doi.org/10.1117/12.592296

KEYWORDS: Glasses, Thulium, Doping, Laser glasses, Ions, Optical pumping, Fiber lasers, Refractive index, Fiber couplers, Spherical lenses

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Proceedings Article | 4 April 2005 Paper

Cross-relaxation energy transfer in Tm3+ doped tellurite glass

Jianfeng Wu, Shibin Jiang, Tiequn Qiu, Michael Morrell, Axel Schulzgen, Nasser Peyghambarian

Proceedings Volume 5723, (2005) https://doi.org/10.1117/12.592289

KEYWORDS: Energy transfer, Thulium, Ions, Glasses, Doping, Absorption, Phonons, Luminescence, Calibration, Solid state lasers

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Proceedings Article | 26 December 2001 Paper

Optical microdisk fabrication with sol-gel techniques and its application

Zhanjia Hou, Jianfeng Wu, Liying Liu, Lei Xu, Wencheng Wang, Fuming Li

Proceedings Volume 4435, (2001) https://doi.org/10.1117/12.451143

KEYWORDS: Sensors, Waveguides, Sol-gels, Rhodamine B, Fabrication, Light wave propagation, Pulsed laser operation, Integrated optics, Optical filters, Transmittance

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