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The Er3+ laser performance in materials can be enhanced by co-doping with large amounts of Yb3+, along with Cr3+ and Ce3+. The study reported herein focused on examining the complex interactions between these ions, as it relates to the laser emission at 1.5 μm from Er3+.
We experimentally demonstrate a 10 times enhancement to the coincidence-to-accidental ratio of a correlated photon-pair source from a chalcogenide Ge11.5As24Se64.5 nanowire. This improvement is enabled by the low-Raman window of the device.
We show that Förster energy transfer is inhibited in the vicinity of hyperbolic metamaterials and metals — the environments, which enhance spontaneous emission rates. The effect is attributed to high local densities of photonic states.
We demonstrate the use of chirped volume Bragg gratings (VBGs) as flat focusing elements for wavelengths different than the wavelength used for recording of the Bragg grating and with efficiencies of up to 95%. The VBGs were recorded in photo-thermo-refractive (PTR) glass with laser generating at 325 nm and were tested with wavelengths ranging from visible up to near IR spectral regions and beam sizes...
We demonstrated the near-infrared time-domain spectroscopy using phase-locked electromagnetic pulses generated and detected with a sub-5fs laser and a DAST crystal. Transmission spectra of polystyrene and glass were measured up to 180 THz.
We fabricated Er-Yb codoped tellurite spheres for strong upconversion WGM lasing with Q up to 27,000 for 15μm diameter and achieved the index sensitivity of 8.8nm/RIU. Strong amplitude modulation in the modes was also observed.
We describe femtosecond fiber laser systems optimized for high value applications in precision industrial micro-machining. Unprecedented system performance and reliability enable unique manufacturing capabilities for touch screen displays and other difficult-to-machine parts.
Au nano-particles on the bottom surface of a photobioreactor are used as scattering elements and are shown to enhanced oxygen evolution rates in cultures of cyanobacteria by increasing the light path length through the culture.
Stimulated Brillouin scattering amplification is demonstrated in 1 cm-long chalcogenide glass waveguides. The waveguides are directly written using a Ti:Sapphire laser operated at 810 nm wavelength. A Brillouin frequency shift of 7.45 GHz is observed.
We demonstrate strong and robust fiber Bragg gratings in the first low-loss optical fiber made from photo-thermo-refractive (PTR) glass. A high grating strength of 20 dB is maintained even at 12 hour exposure to temperatures above 400 °C.
We present a construction approach to long-lasting rubidium (Rb) atomic vapor cells compatible with integrated photonic platforms. Indium solder seals did not exhibit any decrease in optical atomic density after being held at 95 °C for thirty days.
This paper summarizes our recent progress in 2 micron fiber lasers using Tm and Tm-Ho-co-doped multi-component glass fibers. Single frequency fiber lasers with linewidth less than 3kHz, Q-switched single frequency fiber lasers with kilowatt peak power, and mode-locked fiber lasers near 2 micron wavelength were demonstrated using these newly developed fibers.
We demonstrated thermal nanoimprint fabrication of low loss waveguides and microring resonators in thermally evaporated and solution processed chalcogenide glass films. A high micro-ring quality factor of 75,000 is achieved at 1550 nm wavelength.
We found that Ca additive effectively suppresses the photo-darkening (PD) effect in Yb-doped silica fiber even at 6.0 wt% of high Yb2O3 concentration. Ca ion works as a stabilizer to maintain the Yb3+ valence state. We hypothesize that this phenomenon may reflect the local charge balance effect in silica glass. This Yb-Ca co-doped silica fiber can be useful for high-power fiber lasers.
We report on controllable production of 3D high-aspect-ratio (length to width ratio > 1,000) nanochannel with a width of ∼40 nm in glass by femtosecond laser direct writing, and demonstrate its applicability for DNA analysis.
We demonstrate the demolding of topologically complex three-dimensional elastomeric microstructures from a femtosecond laser micromachined glass substrate. Demolding success rates of >90% are achieved, which are qualitatively supported by a simple mechanical model.
Time-resolved Förster energy transfer from single halide-terminated nanocrystals with n-butylamine ligands (0.6 nm) onto two-dimensional graphene is measured with time-correlated single-photon counting. Remarkable 4× reduction in spontaneous emission is observed (237 MHz) and modified LDOS.
Laser based micro-fabrication tools have become default choices for critical processes in consumer electronics. Smart beam delivery and system design enables high quality low cost manufacturing of several key components in mobile devices.
We introduce a Fano resonant asymmetric ring/disk cavity system employing a conducting layer underneath. Our system shows stronger electromagnetic fields that are highly accessible to surrounding medium and sharper spectral features that result in more reliable and sensitive biodetection platforms.
We report on the fabrication and characterization of rare earth ions-doped water-free fluorotellurite glasses and fibers. For 2.8 mm glass fiber rods, its background loss was −12 dB/m in the range of 2.5–4.2 urn.
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