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Stimulated emission near 3371 Å is reported for the first time using a commercial electron‐beam generator as an energy source. A 2 × 10 3 ‐A∕cm 2 3‐nsec pulse of 400‐keV electrons from a field‐emission diode traveled 160 cm down a ¾‐in. tube containing N 2 at pressures of 10–50...
Artificial depolarization and anisotropy induced broadening of the Raman spectra recorded in air from small RbClO 3 single crystals of extremely poor optical quality can be effectively eliminated by immersion of the sample in an index‐matching fluid. Measurement temperatures as low as −...
The structure of moving domain walls in thin films having a uniaxial anisotropy axis in the plane of the film is calculated by a variational method. The calculation applies for wall velocities ν smaller than a critical velocity at which the derivative of the wall energy with respect to ν...
High‐frequency small‐signal capacitances of semiconductor junction vs temperature, from the initial conditions of filled and emptied traps in the junction depletion region, are used to determine the trap concentration and the thermal activation energies of trapped electrons and holes....
Spatially uniform birefringences tunable over the range 0. 0–0. 15 for applied voltages less than 20 V rms and with a sharp threshold below 4 V rms are obtained for thin layers of nematic liquid crystals with negative dielectric anisotropy. The achievement of spatially uniform tunable...
Room‐temperature cw laser operation well into the visible spectrum (λ ∼ 6000 Å) is reported for In 1− x Ga x P ( x ≤ 0.60). Thin (1–5‐μ) experimental samples are compressed into In, under a thick (∼ 250‐μ) high‐index (η > 2. 6) SiC window, with a thin (10–50‐μ) narrow...
Measurements of transient conductance in response to 80‐nsec pulses of 4–20‐keV electron irradiation have been used to investigate electrical properties of defects in 2–4‐μ Si films on 〈111〉 MgO⋅Al 2 O 3 spinel. Carrier lifetimes ∼ (2–3) × 10 −10 sec are estimated from the...
LiNbO 3 has been found to emit strong luminescence when irradiated by a ruby laser beam. The luminescence varies linearly with input power, is broad band, independent of crystal orientation, and decreases exponentially with the inverse absolute temperature, as does the luminescence decay time....
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