Abstract
Considering field-free molecular alignment enhancement by multiple pulses in the hollow fiber, we theoretically analyze how long-distance propagation influences the final alignment degree. Based on this, we propose a way to enhance frequency tuning of few-cycle femtosecond laser pulse by multi-pump-induced index modulation. It is found that two pumps are optimized with parameters of 100 fs and . The tuning range of the initial 5 fs 800 nm probe pulse by double aligning pumps is about twice that by a single pump.
©2012 Optical Society of America
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