Double femtosecond laser pulses are usually generated by using a Michelson structure.
We propose a novel and simple device by using two high-density transmissive gratings
for generation of double pulses and conversion between single and double laser
pulses by shifting one of the two gratings by a quarter period. The apparatus has
the advantages of compact volume, simple structure, and convenience in
manipulation. Experimental outputs of
the double laser pulses are well verified in experiment, which can be properly
explained by numerical simulation with the rigorous coupled-wave theory. This
structure provides an interesting approach for generation of double pulses and
conversion between single and double laser pulses for practical applications of the
© 2010 Optical Society of America
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