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Using the unique characteristics of multiphoton ionization with focused femtosecond pulses, we report on a pump and probe metrology to analyze carrier dynamics inside dielectrics. We characterize the sub-picosecond trapping of carriers inside fused SiO2.
A quantum-cascade laser design for suppressing carrier leakage from the active region was achieved. For both threshold and slope efficiency the characteristic temperatures, T0 and T1, reach values of 238 K over the 20-60degC range.
We report helicoidal long-period grating by twisting photonic crystal fiber under CO2 laser irradiation and investigated its novel characteristics. The fabricated PCF-LPG endows unique resonance tuning capability with low polarization-dependent loss and thermal shift.
We used pump-probe technique to investigate recombination dynamics of photogenerated carriers in photodiodes consisting of InAs/GaInSb W-structured superlattices. Recombination time constants of 1.6 ns and 10 ns were measured under high and low powers, respectively.
The first VCSEL-based O2 sensor for gas/oil furnace applications employing a diffuse reflector is presented which circumvents alignment and interference problems. Optimized data processing is used for long-term stable operation and allows for real-time measurement.
We report on all-epitaxial growth of large diameter (3-inch), large aperture (>1.5 mm thick), low-loss (<0.005 cm-1) QPM GaAs. 2-mum-laser-pumped OPO performance was comparable to that of ZnGeP2.
Intense terahertz transients induce in GaAs at T = 300 K coherent ballistic electron motions exploring the conduction band through half the Brillouin zone. At T = 80 K we observe terahertz driven tunneling from the valence into the conduction band.
Phase Doppler interferometry applied to spray research has improved combustion efficiency with emissions reductions and led to insights in atmospheric and meteorological research. Laser-induced incandescence is demonstrated as a means for monitoring combustion particulate emissions.
The three thermo-optic coefficients of the biaxial laser host KLu(WO4)2 are measured at 633 nm by a deflection method and nearly athermal propagation directions are found for polarizations along the Nm and Np principal axes.
A Multichannel frequency scanning laser which is to be used as a source in a high speed phase-shifting interferometer to measure 3D profiles of nanostructures is presented.
An exposed Bragg grating incorporated into a planar waveguide was used to form a refractive index sensor. The high sensitivity to subtle changes allowed the study of surface functionalisation and binding within a microfluidic system.
We demonstrate the origin of, and quantify the contributions to, the poor external differential efficiency we observe in InP quantum dot lasers. Injection efficiency limits the internal differential quantum efficiency to 50%.
We report on the use of confocal thermoreflectance for accurate surface temperature measurement of transparent LEDs. Confocal thermoreflectance effectively suppresses light from beneath the LED surface, compared to widefield measurements, for a red GaP LED.
We observed that photoluminescence intensities clamped at certain values as the pump intensity was increased, due to the presence of nonlinear degenerate electron gas and saturation of photogenerated and localized holes in InN.
Arsenide-based III-V microtubes are formed by a strain-induced self-rolling process. We report room-temperature photoluminescence characteristics of such microtubes with embedded GaAs quantum-well structure that is only 38 nm in total wall thickness.
We demonstrate a Quantum Cascade Laser employing ultra-strong (~20 meV) coupling between the injector and the upper laser state. The laser shows a pulsed wall-plug efficiency of 34%(8%) and peak power of 8.0 W(2.0 W) at 80 K(300 K).
Ambipolar diffusion coefficient in silicon-on-insulator is measured as functions of lattice temperature and carrier density by directly imaging the carrier dynamics by using a high resolution optical pump-probe technique based on free carrier absorption.
A stable self nano-aggregated bathocuproine film was fabricated and introduced atop of conventional organic light emitting diode for enhancing top emission leading to 2.7 times enhancement on top emission due to scattering surface plasmon energy.
Evidence of defect reduction in CdTe nanoparticles upon rapid thermal processing is observed using Raman spectroscopy performed in hollow-core photonic crystal fiber. The Raman spectra indicates the reduction of Te-Te defects in the annealed nanoparticles.
We report more than one order of magnitude stronger green photoluminescence from InGaN/GaN nanorods arrays compare to that from InGaN epilayer and its emission mechanism studied by time-resolved and temperature-resolved photoluminescence measurement.
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