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Silicon-on-insulator (SOI) finite-size CROWs with optimized flat-band spectrum, excellent group-delay response, and compact size are experimentally demonstrated using direct correspondence with ladder-type LC circuits. Sensitivity analysis attributes residual distortions to non-ideal fabrication rather than coupling-induced-frequency-shifts.
Visible femtosecond laser pulse is generated during filamentation of an 808 nm femtosecond laser pulse by a fourth order nonlinear polarization. The wavelength could be tuned from 460 to 520 nm.
Ferroelectric fluorides are the key materials for the SHG in the UV/VUV by the QPM technique. Ferroelectric characteristics and large single crystal growth are addressed. UV SHG emission is demonstrated with BaMgF4 QPM devices.
The lifetime and the Auger coefficient for 1s paraexctons in Cu2O from 5 K to 70 K was measured directly using excitonic Lyman spectroscopy. A possible experiment for realizing excitonic Bose-Einstein condensation is discussed.
We find the onset of laser-induced InSb thermal dissociation using coherent optical phonon detection under asynchronous optical sampling. Additionally, laser-induced annealing of Sb thin films is monitored in photoacoustic measurements of sound velocity in real-time.
Ladder operators are introduced to analyze the Pancharatnam-Berry(PB) phase. Space-variant PB phase structures are identified in polarization grating and cholesteric liquid crystal. The wavefront shaping and the beam propagation direction alteration are demonstrated.
We report on synchronously pumped OPOs with intracavity SHG or SFG in the same MgO:PPLN crystal. At e.g. 590nm an output power of 190mW was obtained with 140fs pulses at a repetition rate of 81MHz.
A 977-nm Yb fiber laser is calculated to have high efficiency when operating in the LP07 high-order mode of a large core diameter (43 μm) fiber, with Yb doped in a ring inside the core.
A method is proposed for improving the robustness of fluorescent tomography by estimating the likelihood of non-zero concentration at any voxel. Phantom experimental results demonstrate robust reconstruction despite significant modeling mismatch due to optical heterogeneities.
A compact vacuum-free hard x-ray source based on high-field pulses from a femtosecond fiber laser interacting with nickel in gently flowing helium is demonstrated. Ka x-ray conversion efficiency is 1.7×10-9.
A simple fused silica light-guide assembly transmits 6kW concentrated solar power to a 2D-CPC cavity. The calculated laser power of 75.8W is obtained for a 4mm diameter Nd:YAG rod, reaching the conversion efficiency of 11W/m2.
A new approach for direct sub-10nm pattern transfer using spin-coated ZrO2 is presented. The sample InP compound etching selectivity to ZrO2 is over 13:1 with highest aspect ratio of 35:1. The smallest feature is 9nm.
The propagation loss of single mode high index contrast AlGaAs ridge waveguides is reduced nearly three orders of magnitude (at 1 cm guide length) through application of a nonselective wet oxidation sidewall roughness smoothing technique.
Raman spectroscopy has been used to study the femtosecond laser micromachined regions inside silicone-based hydrogel polymers. No significant changes in the Raman spectrum are observed even when index change is as large as +0.06.
Two sizes of ZnO quantum dots with resonant energy levels were mixed to confirm the energy transfer and resultant energy conversion using time-resolved photoluminescence spectroscopy. The energy transfer time was found to be 130 ps.
We characterize femtosecond surface plasmon pulses that are excited through conventional prism coupling on metal films. The resonant excitation mechanism causes spectral narrowing and phase changes that result in temporal broadening of ultrafast plasmon pulses.
Near-field probe was used to tune the resonance wavelength of a linear cavity. Theoritical and experimental study are presented to show the effect of the probe material on the cavity resonance.
We have implemented and tested a reflective spatial light modulator capable of patterning the far field intensity distribution of an intense pulsed laser beam, leading to spatially regularized multiple filamentation in air.
We report multi-watt, TEM00 emission from a 2μm Sb-based optically-pumped semiconductor disk laser utilising an intra-cavity diamond heatspreader for thermal management. An output power of 5W and a wide tunability of over 160nm are achieved.
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