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A reflection acoustic microscope system that operates directly in air at standard atmospheric pressure is described. The system utilizes a focused acoustic transducer operating at 2 MHz and the associated electronic system measures both the phase and amplitude of the reflected air signal. The...
We report new results on dynamic photon statistics of 1.5‐μm distributed feedback buried heterostructure lasers when driven from below threshold at 1.5‐GHz modulation. In contrast to Fabry–Perot lasers, a transient turn‐on delay fluctuation in the total power of about 50 ps is observed...
High quality gold spots and lines have been deposited from gaseous dimethyl (2, 4‐pentanedionato) gold (III) using a focused argon ion laser. Growth rates of 1 μm/s at power densities of 4×10 5 W/cm 2 were obtained. Resistivity, threshold writing power densities, and deposition rates were...
The speed of operation of negative differential resistance (NDR) devices based on resonant tunneling in a double‐barrier quantum‐well structure is considered. It is shown that the intrinsic RC delay of a single barrier limits the frequency of active oscillations to f max =1/(2πτ), where...
The results of two types of experiments on electrochromic (poly)crystalline films of rf sputtered WO 3 are presented as additional new evidence that the behavior (especially scattering) of the free electrons plays a dominant role in the electrochromic properties of such films.
The relation for the frequencies of phonon‐plasmon modes in two‐component solutions is presented. Raman spectra from over 80 samples of Ga 1− x Al x As over a wide range of x values and varying electron concentrations have been fitted to predicted curves using this relationship. Data were...
A superluminescent AlGaAs diode emitting 350 mW of cw optical power at room temperature has been demonstrated for the first time. This extraordinarily high power for nonlasing operation was achieved by combining efficient quantum well material with an edge‐emitting, multiple‐emitter, short...
The spectral linewidth of an external‐cavity single‐mode GaAs/AlGaAs laser diode was stabilized by controlling the phase of the feedback light, where a fiber‐optic ring resonator was used as a linewidth discriminator. The stabilized linewidth is about 500 kHz with a short‐term fluctuation...
This letter describes the first use of a laser plasma x‐ray source for the recording of surface reflection EXAFS (extended x‐ray absorption fine structure), or reflexafs. A powerful technique in which a subnanosecond pulse of x rays is used to record the reflection spectrum over a range of...
We describe a depth‐profiling concept using the critically damped plasma wave corresponding to the propagation of the free‐carrier plasma density generated by a modulated laser in a semiconductor.
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