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تعداد نتایج: 1033969 فیلتر نتایج به سال:
Testing of mixed-mode VLSI systems demands specialized instrumentation tools to simultaneously source and track multiple analog and digital signals. We present a single-chip solution for synchronous acquisition of 16 channels of independent currents, ranging five orders of magnitude in dynamic range over four scales. The digitally programmable chip is one component in an integrated system that ...
As new medical applications of ultrasound emerge with operating frequencies in the hundreds of kilohertz to low megahertz region, it becomes more important to have convenient calibration methods for hydrophones in this frequency range. Furthermore, short diagnostic ultrasound pulses affected by finite amplitude distortion require that the hydrophone frequency response be known well below the ce...
An all-acousto-optically switched picosecond Nd:YAG regenerative amplifier has been developed for operation at pulse repetition rates in the 20-100-kHz range. The amplifier produces stable 50-ps pulses at 1064 nm in a TEMOO transverse mode with pulse energies of the order of 20-100 AJ. Generation of the second harmonic at 532 nm in KTP crystal results in conversion efficiencies greater than 40%...
Martin Grossmann,1,* Matthias Klingele,1 Patricia Scheel,1 Oliver Ristow,1 Mike Hettich,1 Chuan He,1 Reimar Waitz,1 Martin Schubert,1 Axel Bruchhausen,2 Vitalyi Gusev,3 Elke Scheer,1 and Thomas Dekorsy1 1Department of Physics, University of Konstanz, Germany 2Instituto Balseiro & Centro Atómico Bariloche (CNEA) and CONICET, Argentina 3IMMM, UMR-CNRS 6283, Université du Maine, Av. O. Messiaen, 7...
We present the research advances on the development of 50-200 mJ energy range diode-pumped Yb:CaF2based multipass amplifiers operating at relatively high repetition rates. These laser amplifiers are based on diverse innovative geometries. All these innovations aim to design compact, stable and reliable amplifiers adapted to our application that consists in pumping ultrashort-pulse OPCPA (optica...
— Reflectivity, fluorescence and photoelectron spectra from CaF2 single crystals hâve been measured using synchrotron radiation in the 10 to 100 eV range. The spectra contain features ascribed to excitons and to the band structure. Peaks due to conduction-band states derived from the 3d atomic levels are prominent in ail three
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