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An off-axis, single-pass, radial-group-delay compensator was designed using an Offner triplet and two negative lenses for a broadband (810∼1010-nm) optical parametric amplifier laser. It reduces radial group delay from 270 fs to 0.7 fs.
Diagnosis of the on-target focal spot using the current OMEGA EP diagnostics is challenging due to differential piston uncertainty and calibration errors. Performance was improved by retrieving phase information from far-field images using numerical optimization.
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