Hello everyone,
Normally, I use the autocollimation technique in the case of a cw laser which implies the use of an additional objective lens (OL) right away the laser to wider the beam. However, in the case of a pulsed fs laser, I would be concerned about the group delay dispersion (GDD) of the OL. Obviously one would suggest to use a GDD-minimized OL for this aim but maybe there is another way to collimate the beam without having to buy an additional OL. Beam divergence of the laser is < 1 mrad.
Would be thankful for sharing your expertise (if any).
Yevhenii Morozov
Hi Michael,
Thanks for the suggestion. As I understand, an off-axis parabolic silver-coated mirror could be the option (as such kind of mirrors introduce negligible dispersions of any orders).
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