Reference Beam with two Bi-Concave Lenses

[alan.bogana]

Hi,

I'll try soon to shoot some 30 x 40cm transmission holograms.
I've noticed that I manage to cover that size by using two bi-concave lenses, one after the other, for the reference beam. I'm using a 532nm DPSS laser with the two lenses and the beam is much cleaner (and brighter) than if I use one 40x microscope objective (without a spatial filter, which I still miss at the moment), which results in a blotchier image. Should it work ? Is there other problems beside cleanliness of the beam by using the two lens solution ? Aberrations/magnifications aside (which for me are not a problem at moment)... I'm going to do a test on small format soon but wanted to have your opinion on that before.

Cheers
Alan

[BobH]

Should work fine, especially if the lenses are anti-reflection coated. If not, you may have "ghost" images.

[alan.bogana]

Ok, thank you very much !
Alan

[Holomark]

I use the same technique. It works fine with my 532 DPSS and HENE at the same time.
Mark