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We present an analytical phase expression for an Offner triplet telescope stretcher based on ray tracing and apply it to analyze a chirped-pulse-amplification (CPA) system that includes an Offner stretcher. The results of our calculations show that the aberration caused by an off-center grating arrangement of an Offner stretcher can be used to cancel out the material dispersion of the CPA system. The optimization of the grating position provides a flat and broadband phase window for the CPA system, which leads to high-fidelity recompressed pulses.
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Jiang et al. (2002) studied this question.
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