Picosecond optical MCPI-based imagers

Robert A. Buckles; Robert L. Guyton; Patrick W. Ross

doi:10.1117/12.930314

15 October 2012 Picosecond optical MCPI-based imagers

Robert A. Buckles, Robert L. Guyton, Patrick W. Ross

Proceedings Volume 8505, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion; 850502 (2012) https://doi.org/10.1117/12.930314
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

We present the desired performance specifications for an advanced optical imager, which borrows practical concepts in high-speed microchannel plate (MCP) intensified x-ray stripline imagers and time-dilation techniques. With a four-fold speed improvement in state-of-the-art high-voltage impulse drivers, and novel atomic-layer deposition MCPs, we tender a design capable of 5 ps optical gating without the use of magnetic field confinement of the photoelectrons. We analyze the electron dispersion effects in the MCP and their implications for gating pulses shorter than the MCP transit time. We present a wideband design printed-circuit version of the Series Transmission Line Transformer (STLT) that makes use of 50-ohm coaxial 1.0 mm (110 GHz) and 1.85 mm (65 GHz) hermetically sealed vacuum feedthroughs and low-dispersion Teflon/Kapton circuit materials without the use of any vias. The STLT matches impedance at all interfaces with a 16:1 impedance (4:1 voltage) reduction, and delivers a dispersion-limited sharp impulse to the MCP strip. A comparison of microstrip design calculations is given, showing variances between method of moments, empirical codes, and finite element methods for broad, low-impedance traces. Prototype performance measurements are forthcoming.

Citation Download Citation

Robert A. Buckles, Robert L. Guyton, and Patrick W. Ross "Picosecond optical MCPI-based imagers", Proc. SPIE 8505, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion, 850502 (15 October 2012); https://doi.org/10.1117/12.930314

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KEYWORDS

Microchannel plates

Picosecond phenomena

Imaging systems

Transformers

Finite element methods

Linear filtering

Magnetism

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