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An intense optical beam is reflected backwards from a laser‐induced spark in argon and nitrogen gas at high pressures. The reflected beam is about 10% as intense, diverges with a comparable angle, and has the same frequency (to within about 0.01 cm −1 ) as the incident beam. By simultaneously...
The sticking coefficients of silver and gold evaporated on a SiO substrate under ultrahigh‐vacuum conditions have been measured as a function of the thickness of the metal deposit. The mass of the deposit was determined by a quartz crystal oscillator. The incident rate of the metal was measured...
The dielectric and electro‐optic properties of KTa x Nb 1− x O 3 (KTN) are discussed from the point of view of the material's usefulness in light modulators and beam deflectors. It is shown that baseband light modulators with 200‐ to 300‐Mc∕sec bandwidths and analog deflectors with 200...
Expressions are obtained for the power radiated by a modulated electron beam passing near the surface of a (perfectly conducting) diffraction grating. The electromagnetic fields are calculated in terms of the two‐dimensional scalar Green's function for the grating surface. The grating profile...
Measurement of the low‐frequency impedance of a Langmuir probe in a plasma can give the local electron density and temperature. Such diagnostic methods have been employed in ionospheric probing, but the interpretation of the results based on simplified theory has not been entirely satisfactory....
All 14 third‐order elastic coefficients of quartz have been calculated from the measured transit times for small‐amplitude ultrasonic waves as functions of applied stress. Thirty‐four different experimental runs were made, ten under hydrostatic pressure, and 24 under uniaxial stress. The...
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