Multiplexed broadband beam steering system utilizing high speed MEMS mirrors

We present a beam steering system based on micro-electromechanical systems technology that features high speed steering of multiple laser beams over a broad wavelength range. By utilizing high speed micromirrors with a broadband metallic coating, our system has the flexibility to simultaneously incorporate a wide range of wavelengths and multiple beams. We demonstrate reconfiguration of two independent beams at different wavelengths (780 and 635 nm) across a common 5x5 array with 4 us settling time. Full simulation of the optical system provides insights on the scalability of the system. Such a system can provide a versatile tool for applications where fast laser multiplexing is necessary.Comment: 11 pages, 6 figures, submitte

Particle-in-cell simulations of rf breakdown

Breakdown voltages of a capacitively coupled radio frequency argon discharge at 27 MHz are studied. We use a one-dimensional electrostatic PIC code to investigate the effect of changing the secondary emission properties of the electrodes on the breakdown voltage, particularly at low pd values. Simulation results are compared with the available experimental results and a satisfactory agreement is found.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France

Susceptibility, magnetization, and specific heat in the paramagnetic and ferromagnetic regions of (Y 1− x

An anomalous magnetic phase diagram for (Y1-xU x)B4 has previously been reported. This system is paramagnetic for x>0.6, ferromagnetic for 0.

Saturation magnetization in the anomalous ferromagnet, (Y, U)B4

For the (Y1-xUx)B4 system, long-range ferromagnetism only occurs for 0.0

Susceptibility, magnetization, and specific heat in the paramagnetic and ferromagnetic regions of (Y1-xUx)B4

An anomalous magnetic phase diagram for (Y1-xU x)B4 has previously been reported. This system is paramagnetic for x>0.6, ferromagnetic for 0.

Resistivity, susceptibility and specific heat of (Y1-xUx)B4

An anomalous magnetic phase diagram for dilutions of UB4 with YB4 had been previously established. The (Y1-xUx)B4 system is paramagnetic for x 0.6, ferromagnetic for 0.1 < x < 0.6 and paramagnetic for x < 0.1. Measurements of the resistivity and magnetic susceptibility for 1 K < T < 300 K and the low temperature specific heat are presented. The observed behavior is suggestive of a localization of the 5f electrons upon dilution of UB4 by YB4 due to the reduction of the 5f-5f overlap. © 1985