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Using the ray-tracing method,we demonstrate that a grating-telescope stretcher is the conjugation of a grating pair compressor.We present an analytical formula for calculating the phase dispersions of the grating-telescope stretcher.The computer simulation with the formula demonstrates that there exists an optimal material dispersion for an amplification system,with which we can achieve the largest dispersion-free bandwidth.
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Keywords:
- femtosecond laser amplifier /
- stretcher /
- compressor /
- dispersion compensation.
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