Magnetic data storage technology and the everincreasing speed of information processing have brought enormous changes to our daily life. These developments naturally lead us to ask if there is a physical limit to the speed at which magnetic moments can be switched [1]—a topic that has caused no shortage of controversy in the scientific community. Exploring this limit is complicated, partly beca...

We study the nonlinear polarization rotation induced by a pump pulse on a probe beam through cross-phase modulation inside a silicon waveguide and show that this phenomenon can be used to realize a fast Kerr shutter in spite of the free-carrier effects and walk-off. We show that free carriers generated by the pump pulse through two-photon absorption affect the switching process considerably, es...

This is the digital implementations of Sinusoidal Pulse Width Modulation (SPWM) generators based on analog circuits. The FPGA based SPWM generator is capable to operate at switching frequencies up to 3 MHz, thus it is capable to support the high switching frequency requirements of modern single-phase dc/ac power converters. The Existing design the switching operation is in 1 MHz. Additionally, ...

Symbolic analysis methods for averaged modeling of switching power converters are presented in this paper. A general averaging method suitable for computer-aided modeling is discussed first. Then, a symbolic analysis package that uses this averaging method to automatically generate an analytical averaged model for a switching power converter is described. The package is implemented using the co...

This paper deals with Metropolis Monte Carlo analysis of the all-optical switching. The laser-induced magnetization dynamics with various laser pulse fluencies and durations are followed by analysis of probable transitions occurred in the sample. The calibration of Monte Carlo steps with physical time was performed by comparison with a reference dynamics described by Landau–Lifshitz–Bloch equat...

We present a low-cost multimode diode pumped passively Q-switched Cr:LiCAF laser operating near 800 nm. AlGaAs-based saturable Bragg reflectors (SBRs) were used for passive Q-switching. The system is experimentally characterized in detail using four different output couplers and two SBRs with modulation depths. Pulse widths the 1.5–4 µs range at repetition rates between 18 40 kHz achieved avera...