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Observation of self‐pulsing in a helium‐cadmium laser is reported in which two running pulses are present inside the cavity. The beat frequency between the two pulses is more stable as the number of modes is decreased, and is very regular at about 8 kHz when only two modes are present within...
Observation of self‐mode‐locked pulses with a rotating‐mirror Q ‐switched CO 2 laser is reported. Pulses as short as 10 nsec, narrower than the normal CO 2 linewidth limit, were obtained. The shortness of these pulses is attributed to saturation broadening of the pulse spectrum.
Sheet‐resistivity and Hall‐effect measurements on ion‐implanted silicon wafers have been performed. Carrier concentration profiles over the range of about 10 19 –10 11 carriers∕cm 3 have been obtained for implants of 10 14 ions∕cm 2 of 11 B, 27 Al, and 31 P. Three regions, due to...
The microwave (9.61 GHz, dielectric constant of n ‐Si was measured as a function of crystallographic orientation and as a function of applied dc electric field (warm electron conditions) at 77 °K lattice temperature. The dielectric constant was found to be anisotropic. An analysis of the...
Dye laser action has been achieved with a pulsed N 2 laser as the pumping source. The dye laser pulses vary in length from 2 to 10 nsec for the various dyes used and have been tuned to cover the entire visible spectrum with the proper choice of dyes and cavity optics. The system is capable, for...
A pronounced negative resistance and ultrarapid switching between an initial insulating state and a conducting state has been observed in thin films of NiO at room temperature. The switching is reversible with respect to polarity change and quite stable even after repeated cycling.
The attenuation of Rayleigh waves in quartz was measured as a function of temperature from 4.2 to 100 °K and frequency from 300 to 2000 MHz. Below 20 °K, the attenuation was observed temperature‐independent. From 20 to 40 °K, the results were consistent with a three‐phonon interaction...
The average thermal velocity of atoms in an atomic‐beam apparatus is measured using the velocity‐dependent interaction ⋅( / c )× μ → ⋅ ( v → ∕ c ) × E → .
Accurate measurements of spin‐wave resonance absorption peaks from 5 to 70 GHz show that the deviation from a 1∕ p 2 falloff is a strong function of frequency. It is pointed out that any intensity model must incorporate such frequency dependence.
Using grazing‐angle high‐energy electron diffraction (HEED) epitaxial crystallites of β‐Sic have been observed on Si surfaces simultaneously with the silicon fractional‐order surface structures. SiC has not been observed with the LEED technique under comparable experimental conditions....
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