by Joe Farina » Sun Dec 14, 2014 10:00 am
I was wondering if anyone has tried to spatially filter a ball lens. I need a highly diverging reference beam. A 100x objective will provide approximately enough divergence, but 125x or 150x might be better. So far, it's been difficult to spatially filter 100x objectives (although my spatial filter is a cheap one with screws instead of micrometers).
It looks like ball lenses can provide the right kind of beam expansion, but I would need to modify my spatial filter to accommodate one. When first starting out in holography, I managed to build a homemade spatial filter with a lens and a pinhole (aluminum foil). Edmund has a short tutorial on ball lenses:
http://www.edmundoptics.com/technical-r ... all-lensesI was wondering if anyone has tried to spatially filter a ball lens. I need a highly diverging reference beam. A 100x objective will provide approximately enough divergence, but 125x or 150x might be better. So far, it's been difficult to spatially filter 100x objectives (although my spatial filter is a cheap one with screws instead of micrometers).
It looks like ball lenses can provide the right kind of beam expansion, but I would need to modify my spatial filter to accommodate one. When first starting out in holography, I managed to build a homemade spatial filter with a lens and a pinhole (aluminum foil). Edmund has a short tutorial on ball lenses: http://www.edmundoptics.com/technical-resources-center/optics/understanding-ball-lenses