Optical fiducials for x‐ray streak cameras at LLE

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Abstract
The incorporation of an optical timing fiducial onto a time‐resolved x‐ray streak record permits one to precisely relate the x‐ray emission to the incident laser pulse. At the Laboratory for Laser Energetics, our approach to recording fiducials is twofold. In addition to recording the x‐ray emission on a bifurcated photocathode, we also streak the incident laser light at 351 nm, which is scattered from the target and an independent signal at 4ω0 (264 nm), which is derived by frequency quadrupling a tiny fraction of the OMEGA laser driver output. The signal at 4ω0 is transported through the vacuum wall to the streak camera photocathode via fiber optics. A 200‐Å aluminum layer on mica is utilized for the UV sensitive photocathode. We will present examples and further details of this system.