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A novel finishing process, called Convergent Polishing, is described where the workpiece regardless of its initial shape will converge to final surface figure under a fixed, unchanging set of polishing parameters in a single iteration.
We present simple and efficient laser schemes based on newly developed Er-doped fibers cladding pumped at 976 nm. 103 W CW-power amplifier with 37 % conversion efficiency and 1.5 mJ-pulse energy nanosecond laser were demonstrated.
Erbium doped chalcogenide films were fabricated by cothermal evaporation and demonstrated propagation losses and lifetimes suitable for waveguide amplifiers. The 1490nm pumped Photoluminescence yield is up to ∼10x higher than the prior best film material, Er:TeO2.
We propose and show experimentally uniform axisymmetric spatial filtering of light beams by three-dimensional axisymmetric photonic microstructures. Such gapless structures (similar to photonic crystals) were recorded in bulk of glass. Angular filtering of 25 mrad is demonstrated experimentally.
Diffuse reflectors can be beneficial for solar cells, due to no plasmonic loss, higher reflectance, decent light scattering, and low cost. Experimental and theoretical works are presented here to demonstrate its feasibility for photovoltaics.
We computationally study the irradiance enhancement in As2S3 motheye structures. We show that enhancement in the glass is minimal, matching with experiments showing an increased laser damage threshold for motheye structures versus thin-film AR coatings.
Determination of the absolute handedness of single enantiomer at small quantities is essential in chiral drug developments. Here we provide theoretical insights, numerical analysis and experimental demonstrations of high sensitivity to zepto moles of chiral molecules using optical metasurfaces. We introduce a figure of merit (FoM) for metasurfaces that can be extracted from simple far-field scattering...
We demonstrate the supercontinuum generation in an As2Se5 microstructured optical fiber experimentally. The SC bandwidth of 4280 nm wider than two octaves covering from 1370 to 5650 nm is obtained in 4.8 cm long fiber.
Planar waveguide ring resonators are directly written in thin films of As2S3 glass, using two-photon laser beam lithography at 810 nm. Q values of 80,000 are observed.
By combining magnetic nanoparticle 3D positioning system and NV ESR measurements in micro-fluid device, we demonstrate sensing of magnetic fringe field of a magnetic bead repeatedly displaced and mapping field profile of the magnetic dipole.
In this invited talk, we review our cutting research on flexible glass substrates using both laser ablation and laser crack propagation methods. The methods are evaluated in terms of cut edge quality, speed and path to manufacturing.
Fluorozirconate-based, highly transparent glass ceramics doped with Nd3+ exhibit very low multiphonon relaxation rates following an exponential energy gap dependence. The resulting high radiative quantum efficiencies show the material's potential for amplifier applications.
The nanostructure induced by the direct-writing of femtosecond-laser pulses can open a new opportunity to develop avant-garde devices such as a 5D optical storage, polarization imaging sensor, thermoelectric conversion elements.
Using novel liquid cooled slab laser amplifier technology we have developed laser systems capable of amplifying nanosecond laser pulses to energy of ∼1 kJ at repetition rate up to 0.1 Hz. The design and performance of these liquid cooled amplifiers at 18 cm aperture will be described along with plans to scale this technology to larger aperture and higher repetition rate.
A more than one-octave-wide supercontinuum (0.9 to ∼2.1 µm) is generated in a double-nanospike As2Se3-silica step-index waveguide. The average supercontinuum spectral intensity is increased by ∼20 dB compared to the previously reported single-spike structure.
We use spontaneous emission of Eu3+ ions as a spectroscopic tool to probe modifications of optical fields in close vicinity of metal and under the conditions of the optically-induced magnetic resonance. We reveal strictly different behavior of electric and magnetic dipole emission in a simple microscope setup, and also discuss the results theoretically.
We demonstrate the scalable production of the first robust tellurium-based chalcogenide glass fibers provided with a built-in polymer jacket and transmit mid-wave and long-wave infrared light across the 3 – 12 micron window.
Femtosecond laser written nanogratings show a random transition from self-organized to disordered structure and vice versa. A reason for the transition is proposed. Overlapping laser scans create nanogratings with apparent self-aligned fringes.
Femtosecond laser inscription of high performance active/passive waveguides is demonstrated in phosphate glass via local modification of the glass composition. La-K cross diffusion plays a key role in the performance of the generated structures.
When the chalcogenide-tellurite hybrid optical fiber is pumped by an optical parametric oscillator with the pump wavelength from 1700 to 3000 nm, widely tunable second-harmonic generation (SHG) from 850 nm to 1502 nm is obtained.
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