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We propose the use of birefringent materials to attain pulse separations suitable for pump-probe spectroscopy and spectral interferometry. By choice of material thickness and cut angle, it is possible to balance second-order dispersion while allowing for variable delays. The generated pulse pair is used to calibrate the phase response of an ultrafast liquid-crystal pulse shaper, and in the measurement of a rotational wave packet in impulsively aligned CO(2) molecules.
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Schlup et al. (2007) studied this question.
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