Spatial phase dislocations in femtosecond laser pulses
نویسندگان
چکیده
We show that spatial phase dislocations can be generated in femtosecond laser beams by computergenerated holograms provided they are build in a setup compensating for the introduced spatial dispersion of the broad spectrum. We present analytical results describing two possible arrangements dispersionless 4f -setup and double-pass grating compressor. Experimental results on the generation of optical vortices in the output beam of a 20fs-Ti:sapphire laser and proof-of-principle measurements with broadband-tunable cw Ti:sapphire laser confirm the theoretical predictions.
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