| Rob
March 15 2004 at 7:59 AM | Dinesh (no login)
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| I thought I'd start a new thread since the other one is going off my page. Hope no-one minds.
My suggestion is to get the Integraf kit (http://www.holokits.com/holographic_film_plates.htm#Holography Kits). However, if you want to set it up yourself, go to a photography supply store and ask for the slowest film they have, pan-x?, tri-x? Then set up the holographic system with a low an angle as you can for the reference beam. That is, keep the reference beam as near the centre of the film axis as possible. Try about 20 to 25 degrees off the film axis. If you have access to a 532 laser diode (I just got one from Fry's for about $150) I can let you have some film. Unfortunately, I don't work in red so I have no red sensitive film. The easiest stable set-up is 3 or 4 inner tubes and a slab of stone about 3 feet by 2 feet by about an inch or inc and a half or a similar slab of metal. Don't overinflate the inner tube, they need to squash when the stone slab is placed on them. If they bounce, the tubes are overinflated. Mount your optics on or in anything sturdy and solid. Your local hardware store may have metal rods, small metal plates, perhaps you could play with hinges, maybe get some metal piping and saw it down (you have to be really, really creative to be a holographer!). To attach the optics to your table you can use hot glue for the stone, but this is permanent so you'll need to set up first to make sure everything is OK, then glue down, or you can use small magnets for the metal. If you use a beam splitter, everything from laser to beamsplitter is not so important (but not unimportant either!), but everything after the beamsplitter needs to be really well set down.
If I can be of any help, you can always call me ("Dinesh and Joy' link at bottom of page has link to contact info) between 12 noon and 5pm California time. Today, Monday, we'll be in around 2-ish 'cos we're getting the chimney swept.
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| | Author | Reply | Colin Kaminski
(no login)
| | Re: Rob | March 15 2004, 10:44 AM |
Dinesh, I dare you to make a hologram with that pointer! 
I had mine in an interferometer for a few hours and could not get it to settle down. I finally destroyed it trying to modify it to work. If we find a green pointer I think it will be great news. If anyone succeeds with one let me know and I will buy that model.
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| Dinesh
(no login)
| | Re: Re: Rob | March 15 2004, 2:42 PM |
"Dinesh, I dare you to make a hologram with that pointer!"
Well, we'll all have an opportunity to try for ourselves on April 17th. TJ and Alec have very kindly donated a kit for our meeting which I received this morning. I don't mind if you played with it, but could you keep the barmaid's hands off the laser? I'm sure there are lots of other things she could do with her hands!
I'll also bring the green pointer. We got it from Fry's (an electronic store) for our talk last Tuesday for $129.99. It says it's 532nm 3A (designated less than 5mW). We expanded and illuminated one of our H1's so that the students could see a laser transmission and the beam was pretty clean. It takes two AAA (sorry, no idea what this translates to in countries that don't have this battery nomenclature).
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| Larry
(no login)
| | Re: pointer | March 16 2004, 7:50 AM |
Colin-
RE:"Dinesh, I dare you to make a hologram with that pointer!"
Did you mean the Integraf laser from the kit or the green laser pointer?
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| Colin Kaminski
(no login)
| | Re: Re: pointer | March 16 2004, 10:00 AM |
The green laser. I love my integraf laser. I use it all of the time. It is fun when you have guests in the lab and you just want to make a quick single beam without breaking down the rest of the table. I have been working on seting up a small traveling table around this laser. I think with less than $100 in supplies I can make, transmision, reflection, H2 and rainbow holograms on a 1' x 1' table! I have been working on the rainbow part. It is hard with so little power but I learned a trick ffrom Graham's book that may help. I just need another lens...
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| Dinesh
(no login)
| | Re: Re: Re: pointer | March 17 2004, 8:28 AM |
I thought you meant the Integraf laser. I've not tried the green laser for making holos, but I've reconstructed and it seems pretty uniform. We set up a miniature table for the students with ref and obj paths drawn in and an H1 and the image seemed clean. It's in the last threeof the photos taken by the instructor of the class (History of Art & Technology by Peter Terezakis given at UCSD):
http://www.historyofartandtechnology.com/dinesh.html
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