We have studied the temporal compression of laser pulses occurring in a scheme based on the coherent control peculiarities of electromagnetically induced transparency. This work extends earlier model studies, including the effect of Doppler broadening in a real hot medium. For definiteness and consistency of the atomic parameters employed, we have treated a scheme in argon. In this way, we esta...

II We have developed laser sources ofsodium-resonance radiation based on the sumfrequency mixing ofNd:YAG laser radiation. The sources are suitable for generating a fluorescence spot in the earth's mesospheric sodium layer for use in adaptive optics compensation. Taking into account the sodium fluorescence lifetime, Doppler broadening, hyperfine structUre, radiative saturation, optical pumping,...

Spectroscopic measurements were performed on the re-installed COMPASS tokamak during the first experiments. The impurity survey spectrometer HR 2000+ was used for registration of the most intense spectral lines in the 457–663nm visible range integrated over the discharge duration. The temporal evolution of integral visible light, Hα and hard X-rays intensities are measured by a photomultipliers...

4 T.NE S ..= v A O = TlS S ~~ ' ~TIME --3. Figure 1 Case 1. Doppler ultrasound examination of axillary arteries. (a) Left axillary artery showing diminished height of systolic wave, broadening of complex and absent negative wave as occurs in arteries beyond a stenosis indicating greater than 75% narrowing. (b) Right axillary artery with steep systolic wave and normal negative complex for compar...

In 10 patients with postprandial abdominal pain thought likely to be the result of mesenteric ischaemia Doppler ultrasound examinations of the superior mesenteric and coeliac arteries were performed both after fasting and a standard meal of 800 kcal. Compared with control values Doppler waveform analysis suggested seven abnormal vessels. Two patients had abnormal fasting superior mesenteric art...