June 14, 2004
This weekend we had a couple of house-guests that had come out for a ceili on Friday. While she was here I made a hologram of Catherine's Claddagh ring. I started out with a two-beam transmission setup, intending to make copies and ended up switching to a modified single-beam reflection setup because I didn't think I'd have the time to make copies. The hologram turned out pretty good.
Here's a shot of one of the test images...
Along with working 70+hrs/wk *sigh* I've been slowly working on a Fathers Day hologram for my father. He likes warbirds and I found a good model of the P-51 that was a perfect size for a 4x5" hologram.
I'm using a very simple scene because I plan to leave the hologram un-backed and will put this photo behind it.
I'm using my new, to me anyway, big 30mw HeNe for this and since I haven't mounted it on the wall I'm shielding the work area from the light coming out using several black cards, which you can see lining the wall in the second picture.
I've done a couple of test shots and I'm pleased with the transmission results. Now I just need to set up a master plate and make a copy or two before Sunday.
I finally finished the hologram, a day late but better than never. As long as I can get up early enough I'll make a few copies for myself and take some shots of the finalized scene. I tried to get a few this morning but didn't have time to do it right with the black cloth and tripod. Here's a plane-only shot.
I just found a fairly serious flaw in the copies of the P-51. I hadn't taped off the master along the edges of the glass. I normally do this but was in such a hurry to get the copy finished and off to my dad that I didn't do that this time. Last night I noticed some odd flashes of light when I rotated the hologram and realized that there was some stray light hitting the copy from somewhere. I thought it was a reflection off some mount on the table but after investigating found that the reference light was being reflected off the far edge of the master glass.
I've now taped the master and that stray light is gone. Just goes to show that even if you think you're being careful about carding off stray light getting to the copy all it takes is one "hole" for the light to get through.
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