Abstract

We have studied filamentation and supercontinuum generation by focusing the intense femtosecond laser pulses into an absorptive medium (CuSO4 aqueous solution). A broad spectrum from 350 to 950nm with a flat plateau spanning approximately from 450 to 700nm with a flatness of 9% is obtained without any additional filters. The results indicate that the absorptive medium not only suppresses the strong surplus femtosecond laser signal but also flattens the supercontinuum spectrum efficiently.

© 2010 Optical Society of America

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