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An earlier letter reported microwave (70.2 GHz) measurements of the relative permittivity ϵ r of high‐resistivity GaAs in the temperature range between 100° and 300°K. This letter extends the measurements to 600°K. Over the entire temperature range 100° < T < 600°K, the permittivity is...
A simple technique for observing picosecond light pulses is demonstrated. The overlap between two light beams is measured by two‐photon excitation of a photographic film which is below threshold for one‐photon excitation. The resolution of the method is variable and limited only by the...
The detailed dependence of surface state density on crystallographic orientation was determined by measuring the ac metal‐oxide‐semiconductor conductance on the surface of a thermally oxidized single‐crystal silicon hemisphere. It was found that the 〈111〉 poles are located at maxima,...
A single‐mode pulsed ruby laser was used to record reflection holograms. A photograph of the virtual image of a hologram of one of the authors is shown.
A type of surface wave with no counterpart in a purely elastic homogeneous material is shown to exist in a piezoelectric material. Expressions for the velocity of propagation of this wave are obtained for various electrical boundary conditions on the free surface of a piezoelectric half‐space.
High‐power, high‐efficiency lasing has been obtained from a flowing CO☒Air☒He laser. Maximum power was 20 W at 9% efficiency. The gas mixture was excited premixed in a liquid☒N 2 ☒cooled discharge tube 144 cm long by 2 cm in diameter. Observations pertinent to the roles of the various...
Although gas lasers generally operate in the weak mode‐coupling regime, one may induce strong coupling, hence single‐moding, by means of a saturable absorbing medium placed within the resonator. The effect occurs under conditions where, although the linear gain of the amplifier cell may...
The position of the (1, 0, 0) minima in InP are determined from measurements in the region of interconduction band absorption. Direct transition electroluminescence in the In 1− x Ga x P alloys is observed over a range of alloys up to x = 0.8 and photon energies of up to 2.2 eV at 300°K and is...
Spectral characteristics of doubly and singly resonant‐pulsed optical parametric oscillators are experimentally compared. It is demonstrated that the tuning accuracy of the singly resonant oscillator is at least five times better than that of the doubly resonant oscillator. In addition, a...
The ionic mass analyzer, built by Castaing and Slodzian, has been used for the determination of oxygen isotopic diffusion concentration gradients in massive uranium dioxide samples. Two methods have been investigated: image formation from surface isotopic distributions and ionic current...
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