Variation in light output of Xenon flashlamp with electric discharge condition is measured in -the spectral region from 3500Å to 9500Å. The increase of time-integrated output intensity with input, energy is greater as the wavelength is shorter. At a given value of input energy, when we compare the discharge of long duration with that of short duration, the time-integrated output intensity by the former is less in the range from 3500Å to 5000Å but more in the range from. 5000Å to 9500Å than by the latter. When each discharge has the same peak current, the longer the rise time, .the higher becomes the peak intensity throughout the spectrum. Hence, the optimum discharge condition of Xenon flashlamp for optical pumping should be decided according to the wavelength used for pumping with due consideration on the fluorescence quantum efficiency of the pumping light and the life time of metastable state of the laser material.
When hydrocarbon molecules come in contact with a tungsten emitter held at a high tempera-ture, 1260°K, they dissociate and liberate carbon atoms s which stick on the emitter surface, thus resulting in a particular emission pattern with dark (334) planes. The appearance of these (334)s is followed by a sharp increase of emission current, and by measuring the time taken for this increase to begin, one can detect the amount of the vapor. In the present work, the detection sensitivity of hydrocarbon vapor is measured by introduction of known amount of diffusion pump oil vapor C10H7C16H33 or propane C3H8, and, with the oil vapor and propane, the vapor pressures of the order of 10-10 Torr and 10-9 Torr respectively can be detected in about 10 minutes.
Theoretical equations are derived on polar Kerr and Faraday effects in gyroelectric, that is, magnetized thin films by taking multiple inner reflections into consideration and their analytical. solutions are obtained. The equations are also numerically calculated for 80% Ni_??_20% Fe films bounded by air on one side and by glass on the other as an example to show how the polar Kerr and Faraday components and their rotations vary with film thickness over a range of, 0_??_1000Å. Kerrrotation is affected by multiple inner reflections up to the, film thickness of about 600Å. On the other band, Faraday rotation is affected up to 150Å at the most, but is influenced by a boundary effect even if the film is very thick.
Oscillation characteristics of He-Ne gas laser in pressure range of 1-8 Torr (He/Ne: 5/1) are observed. When the pressure is high, pulsed laser oscillations start in a few microseconds after the application of r-f power. The oscillations last about 20 microseconds. When the rest time (repetition time minus pulse width) is varied, the peak of the pulse becomes maximum at the rest time of 700_??_900 microseconds while the wave form remains unchanged. The above seems attribu-table to the electron growth by the mechanism of HeM+HeM→He++e+He, which causes the electron density to become maximum in the afterglow. In the succeeding excitation, these electrons gain energy quickly and collide with He atoms to give rise to the population inversion. The shortness of oscillation duration seems due to the blocking effect of lower level of Ne (1s).
The optical interferometry is a very important technique for measurement of high electron density in plasma, but the back ground light from plasma is too strong for detection of interference signal with photomultiplier in the usual arrangement of the Mach-Zehnder interferometer. A new differential technique of measurement is devised to overcome this difficulty. The plasma light is splitted into two beams of ordinary ray and extraordinary ray by a Glan-Thompson prism, which are guided separately to phototubes 1 and 2 respectively. The probing light is being polarized to be received only by phototube 1. By differentiation of outputs of the two phototubes, the inter-ference fringe shift is observed on an oscilloscope with no noise of the, plasma light. The measured electron densities of shocked plasmas are 8.4±1016cm-3 at shock speed Mach 14 and 3.35±1017cm-3 at Mach 17.5 in 1mmHg argon.