Showing papers in "Applied Physics Letters in 1965"
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TL;DR: Pastor and Arita as discussed by the authors used a gold-doped germanium detector with a straight xenon flash lamp in close proximity to the liquid nitrogen dewar containing the sample.
Abstract: Fig. 2. A. Instrumental response. B. Excitation spectrum of the 1.93-1L fluorescence of 1I2-atom percent Tm+3 in Er20 3• C. Excitation spectrum of the 1.93-1L fluorescence of 1/2-atom percent Tm+3 in Y203' times as intense as the emission from 1/2% Tm+3 in Y20 3 at 77°K under tungsten excitation. The laser experiments were conducted with a sample approximately 1 cm in length with flat and parallel silvered ends using a fast gold-doped germanium detector. The threshold was less than 3 joules into a I-in. straight xenon flash lamp in close proximity to the liquid nitrogen dewar containing the sample. No laser operation could be obtained from the nearby fluorescent lines at an energy input of 20 joules. The lifetime of the fluorescence is 2.9 msec at 77°K with a build-up time of about 200 f..tsec. Nearthreshold laser emission is observed 50 f..tsec after the 250-f..tsec lamp pulse is over, an effect which is a consequence of this build-up time. CW operation was observed using 500-W quartziodine tungsten lamps as the pumping source. In the configuration used, the liquid nitrogen dewar containing the sample was surrounded by an array of 12 lamps. Threshold was reached with three lamps. The crystals were grown by A. C. Pastor and K. Arita under the direction of R. C. Pastor. We thank D. Roberts for the use of the CW laser housing, C. R. Duncan for technical assistance, and]. Mikiska for the coatings.
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TL;DR: Laser Doppler flowmeter measurement technique for localized flow velocities in gas is described in this paper, noting reliability for high flow velocity in gas and noting reliability of high flow veloities.
Abstract: Laser Doppler flowmeter measurement technique for localized flow velocities in gas, noting reliability for high flow velocities
TL;DR: Curie temperature, static dielectric constant and electro-optic coefficient of large single crystals of barium titanate were reported in this article, where they were used to calculate the Curie temperature and dielectrical constant of large barium- titanate crystals.
Abstract: Curie temperature, static dielectric constant and electro-optic coefficient of large single crystals of barium titanate
TL;DR: In this paper, the authors describe some electrical contact and transport properties of ZnS single crystals having room-temperature resistivities in the range of 1 to 10 ohm-cm.
Abstract: This Letter describes some electrical contact and
transport properties of ZnS single crystals having
room-temperature resistivities in the range of 1 to
10 ohm-cm. Previous electrical transport measurements
on ZnS have been done mainly at high temperatures
or under photoexcitation. Electrical
contacts to ZnS which display ohmic characteristics
at room temperature have been described by Alfrey
and Cooke. A serious limitation to a more extensive
investigation of the electrical properties of ZnS
has been the difficulty in providing ZnS crystals
with contacts which would stay ohmic at low temperatures.
It has also been difficult to dope ZnS
n-type without simultaneously introducing large
concentrations of native acceptor defects.