High-Frequency Interruption of Light

Dynamical control of electron - phonon interactions with high - frequency light

High-efficiency frequency doubling of continuous-wave laser light.

We report on the observation of high-efficiency frequency doubling of 1550 nm continuous-wave laser light in a nonlinear cavity containing a periodically poled potassium titanyl phosphate crystal (PPKTP). The fundamental field had a power of 1.10 W and was converted into 1.05 W at 775 nm, yielding a total external conversion efficiency of 95±1%. The latter value is based on the measured depleti...

High-speed spatial frequency domain imaging with temporally modulated light.

Spatial frequency domain imaging (SFDI) is a wide-field diffuse optical technique used to obtain optical properties and chromophore concentrations in highly scattering media, such as biological tissue. Here, we present a method for rapidly acquiring multispectral SFDI data by modulating each illumination wavelength at a different temporal frequency. In the remitted signal, each wavelength is te...

Effect of High Light Level on Sperm parameters in Mice

Background and aims: High light level of natural or artificial sources in some workplaces may be considered as a hazardous physical agent. The present study aimed to assess the effect of light level of 1000 lux on sperm parameters  in mice.   Methods: The subjects were assessed in two group including 1. Exposed (n= 6; exposed to light level of 1000 lux during 5 eight-hour days), 2. Unexposed ...

The Effects of Task Interruption on Human Performance: A Study of the Systematic Classification of Human Behavior and Interruption Frequency

Interruptions are prevalent phenomena in modern working environments; yet, few interruption studies have been conducted on different types of human tasks. A study using computer-based human behavior tasks was carried out to investigate the effects of interruptions with 4 different primary-interrupting task sets. The tasks used in this study were determined by cognitive and motor skill processes...