We demonstrate that phase-matched frequency upconversion of ultrafast laser light can be extended to shorter wavelengths by using longer driving laser wavelengths. Experimentally, we show that the phase-matching cutoff for harmonic generation in argon increases from 45 to 100 eV when the driving laser wavelength is increased from 0.8 to 1.3 microm. Phase matching is also obtained at higher pres...

Organic compounds containing conjugated carbon chains have been extensively investigated due to their interesting properties including nonlinear optical response. Polyynes are a group of compounds where the conjugation can be modified by appropriate selection of end-groups, enabling "control" and improvement of nonlinear effects. In this work, we investigate three newly synthesized aryl end-cap...

background as the field of off-road cycling is usually remote areas with limited access to medical care, off-road cyclists are at higher risk of animal attacks and related injuries. case presentation we report two cases of dog attacks in off-road cycling and discuss the basic principles in prevention and management of such incidents. the cyclists received all 5-dose regimen of the rabies vaccin...

We present the results of our optical monitoring of the BL Lac object S5 0716+714 on seven nights in 2006 December. The monitoring was carried out simultaneously at three optical wavelengths with a novel photometric system. The object did not show strong internight variations, but displayed clear intranight variations. It tended to have larger variation amplitudes at shorter wavelengths. Cross ...

The spectrum of a platinum hollow-cathode lamp containing neon carrier gas was recorded photographically and photoelectrically with a 10.7 m normal-incidence vacuum spectrograph. Wavelengths and intensities were determined for about 5600 lines in the region 1130-4330 Å. An atlas of the spectrum is given, with the spectral lines marked and their intensities, wavelengths, and classifications list...

We report on a Monte Carlo method for modeling light transport phenomena in multilayer organic polymer light-emitting devices on plastic flexible substrates. The method allows modeling of Cartesian geometrical structures describing the fate of photons through multiple scattering events determined by the wavelength-dependent material optical properties. We apply the method to analyze the wavelen...

JLhere are four recognized types of cell involved in color vision. Receptors absorb light over a restricted region of the visible spectrum, the wavelength of greatest sensitivity being different for different receptors, but the type of response (hyperpolarization) being the same for all wavelengths in all vertebrate receptors. Beyond the receptors, one finds opponent color cells which give one ...

The scattering of SV waves by a canyon in a fluid-saturated, poroelastic layered half-space is modeled using the indirect boundary element method in the frequency domain. The free-field responses are calculated to determine the displacements and stresses at the surface of the canyon, and fictitious distributed loads are then applied at the surface of the canyon in the free field to calculate th...