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A simple fused silica light-guide assembly transmits 6 W concentrated solar power to a 2D-CPC cavity. The calculated laser power of 75.8 W is obtained for a 4 mm diameter Nd:YAG rod, reaching the conversion efficiency of 11W/m2.
Ultra-high Q (>5 times 105) microdisk resonators are demonstrated in a SiNx platform at 650 nm with integrated in-plane coupling waveguides on a Si substrate. Critical coupling to first-order radial-mode is demonstrated using pedestal layer to control coupling.
Tuned by a variable reflective mirror, we achieve 71.2-W free-running and 30-W maximum average power in range of 1866-2107 nm in Tm-doped fiber lasers. Watt-level powers are generated from single crystal and ceramic Cr2+:ZnSe disk lasers.
Waveguides were fabricated inside a Bi-doped silica glass using ultrafast laser inscription. When optically pumped at 980 nm, ultra-broadband gain was measured from the waveguides, paving the way for compact ultra-broadband optical amplifiers.
Transmittance exceeding 92 %m-1 at 266 nm and its permanence after 4 G pulses of laser irradiation are realized in fluorine-doped silica fiber due to the optimized fiber-manufacturing processes such as perform-fabrication and fiber-drawing.
We fabricated photonic crystal nanocavities to enhance erbium (Er) emission in silicon rich nitride nanocrystals. We observed experimental quality factors of ~6000 and 20-fold enhancement, in agreement with numerical calculations of the Purcell effect.
We demonstrate a pair of strongly-coupled, stacked monolithic silicon nitride microdisk resonators coupled to a tapered optical fiber. High-frequency optomechanical interactions between the two microdisks are induced by both optical force and photothermal effects.
GaAs nano-wire waveguides were successfully fabricated on a SiO2/Si substrate for the first time. 15 dB cross loss modulation was achieved by a few mW continuous-wave pump power within a 1.5 mm-long waveguide.
We report the manufacturing and optical characterization of microsphere in chalcogenide. We show that high-Q modes of a 9.2 mumm diameter chalcogenide glass can be efficiently excited using a silica tapered fiber.
Optimization studies of InGaN quantum wells light emitting diodes employing SiO2/polystyrene microlens arrays are conducted. The use of microlens arrays leads to increase in light extraction efficiency by 2.7-times, in agreement with simulation.
A multiwatt Tm3+:Ho3+ co-doped silica fibre laser pumped at 0.79 mum is demonstrated with an extended tuning range from 1920-2120 nm, compared with 1880-2040 nm obtained using a Tm3+ only doped fibre.
We report on strong nonlinear effects in a specific sub-micron scale silica-node within the cladding of a hollow-core photonic crystal fiber at frequencies lying within the air-guiding cladding photonic bandgap.
We have demonstrated nondestructive 3D imaging of the femtosecond laser written 3D structures of both index change and optical breakdown within fused silica by using the optical coherence microscopy providing high lateral and depth resolution.
Si-rich SiOx planar waveguide with Si nanocrystals contributed amplified spontaneous emission at 750-850 nm is characterized by variable stripe length method to demonstrate optical gain and loss coefficients of 60 and 16 cm-1, respectively.
Blue and yellow electroluminescence of MOSLEDs made on Si-rich SiOx with buried Si nanocrystals of different sizes controlled with minimum hydrogen passivation are demonstrated by PECVD at different N2O/SiH4 ratio and total fluence.
Quasi-TM-mode propagation loss of 1.83 dB/cm at lambda = 1.565 mum is achieved in horizontal Si(amorphous)-SiO2-Si(crystalline) slot waveguides with 8.3 nm slots fabricated on silicon-on-insulator. Waveguide loss is measured using a ring resonator with Q ~ 3x105.
Polarization properties of a long-period grating inscribed in a single-mode photonic crystal fiber are presented. A strong modulation in the spectra of polarization-dependent loss and differential group delay with periods of 2.6 and 1.3 nm is reported.
Silicon nitride /silicon dioxide waveguide using plasma-enhanced chemical vapor deposition is reported, which has the loss of ~4 dB/cm. A ring resonator using the waveguide gives the Q of 12,900 and its nonlinear response is studied.
A simple and robust 2.14 um fiber-based laser source is demonstrated via higher order cascaded Raman scattering in silica fiber. The temporal and spectral characteristics of the laser are compared with simulations.
We have demonstrated femtosecond laser direct written volume diffractive optical elements in a fused silica. The fabrication of a built-in coupler consisting of a direct written waveguide and a Fresnel lens has been described.
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