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The statistical distribution of lifetimes of routinely grown and fabricated continuously operated (Al,Ga)As double‐heterostructure lasers is presented and discussed. The 90 typical devices studied were operated as lasers in a dry‐nitrogen elevated‐temperature ambient (70 °C) until failure....
A linearly pumped methyl fluoride laser oscillator‐amplifier is described which yields a peak power of 30 kW in a linewidth <60 MHz. Linear pumping results in nearly complete saturation of the FIR transition and consequently in relatively high photon conversion efficiency, which in the present...
The short‐section critical current density j c of neutron‐irradiated Nb 3 Sn composite wires has been measured at 4.2 K in transverse magnetic fields up to 10 T. Irradiation was conducted at ∼6 K, and j c measurements were made after annealing to 77 K. A fluence of 4.8×10 17 n/cm 2 ( E...
The spectral dependence of positive space charge induced in an Al‐Al 2 O 3 ‐Si MOS structure shows a sharp threshold at 7.8±0.2 eV. This threshold is interpreted to be the onset of band‐to‐band transitions in Al 2 O 3 . The net space charge induced by 10.2‐eV radiation can be positive...
Thin film solar cells, ∼1 μm thick, have been fabricated from amorphous silicon deposited from a glow discharge in silane. The cells were made in a p ‐ i ‐ n structure by using doping gases in the discharge. The best power conversion efficiency to date is 2.4% in AM‐1 sunlight. The...
We report a b i n i t i o calculations on the electronic states of KrF arising from the Kr+F, Kr + +F − , and Kr∗+F separated atom limits. We conclude, in agreement with earlier assignments, that the observed laser transition is C (1/2) ‐ X (1/2) (5.15 eV calculated, 5.00 eV observed). The...
Optical image scanning utilizing the phase modulation of a surface acoustic wave in a separated medium configuration of silicon on lithium niobate has been experimentally demonstrated with two similar techniques. In on e technique the long‐lived silicon surface states are charged and the image...
Clean mode excitation and transmission have been observed in inverted‐ridge waveguides fabricated by liquid‐phase epitaxy of Ga 0.7 Al 0.3 As‐GaAs structures over preferentially etched channels.
A design is reported for a compact and simply constructed CO 2 TEA laser giving pulses of up to 50 J with 0.1‐μs duration from a discharge of dimensions 45×6×6 cm 3 . The gas is preionized by VUV irradiation from two lines of 34 series arcs to either side of the uniform field electrodes to...
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