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A highly nonlinear far‐infrared free‐carrier absorption, rising with the radiation intensity, has been observed in InSb. It is shown that the nonlinearity arises from an increase in the number of free carriers caused by the generation of electron‐hole pairs by light impact ionization in the...
Transmission electron microscopy associated with electron energy loss spectroscopy imaging was used to determine structural spatial variations and compositional variation in heavily doped (0.006 Ω cm) and lightly doped (0.4 Ω cm) luminescent porous silicon films.
Ultrashort lightpulses at λ=1.55 μm are generated by modulating the emission wavelength of a tunable twin guide laser and subsequent compression of the linearly blue‐chirped part of the output down to 3.5 ps. Its simplicity, the low jitter, and the possibility of direct triggering the pulses...
A very large electro‐optic Pockels coefficient is reported in a crystal of rubidium hydrogen selenate. This new material is found to be promising for modulation applications because of its very low half‐wave voltage (∼27 V) which is determined.
We have measured the photoreflectance spectrum at 300 K from a lattice‐matched InAlAs/InGaAs heterostructure bipolar transistor grown by molecular beam epitaxy. The energy features of photoreflectance spectra have been identified and the built‐in dc electric fields and associated doping...
Time‐resolved emission spectroscopy was employed to detect excited species formed by the laser ablation of Bi‐Sr‐Ca‐Cu‐O and Y‐Ba‐Cu‐O targets at atmospheric pressure. The emission spectra at times of up to 100 ns are characterized by the broadband emission of high‐density...
The use of MeV α particles to generate ion beam induced charge images with a signal to noise level approximately ten times larger than previously obtained using protons is described. The effect of α particle induced damage on the resultant image contrast is shown and a method of image formation...
The atomic structure of the B‐type γ‐FeSi 2 /Si(111) interface has been determined by high‐resolution transmission electron microscopy combined with dynamical calculations of the image contrast. Among four models for the interface considered here, only one is found to agree with the...
The temperature and time dependence of the spatially indirect recombination of two‐dimensional (2D) electrons and holes localized at adjacent sides of an isotype n ‐InAlAs/ n ‐InP heterojunction having a staggered band lineup is investigated. With increasing temperature, a much weaker drop...
We studied the electro‐optical response of a bistable cholesteric texture (BCT) display to ac voltage pulses. The material can be driven into states where planar and focal conic textures coexist at zero field and gray scale memory is achieved. According to the properties of the BCT display we...
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