An intragrating-pair parallel plate is demonstrated as a simple, low-alignment-tolerance device for third-order dispersion control in chirped-pulse amplification. We have demonstrated a simple and alignment insensitive device to eliminate third-order phase errors. Instead of needing arc-minute accuracies (as is the case of third-order tuning using the gratings themselves), the plate requires only degree accuracies, easily obtained experimentally. Further, using the numerical simulation, it is shown how different plate configurations can be used in response to changes in the system parameters.
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