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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...
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...
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...
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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