Three holograms

(....) lost these videos

See:
http://laserpointerforums.com/f48/holograms-food-porn-xtals-battery-stonehenge-71793.html
http://laserpointerforums.com/f48/video-transmission-hologram-marbles-70711.html
http://laserpointerforums.com/f48/hologram-70663.html

Very cool!

I finally got a C-6 host in for my LPC-826, and a 200mA driver..

Just got back from a week in Tampa (work) last night, and built the laser this morning.

It peaks at 105mW on my LPM, and stays @105 for a solid 2 minutes before I gave up, and turned it off, so it seems pretty stable. (that was with AR coated glass, so without the glass the actual laser output could be higher?)

I received the plates, and chemistry a couple weeks ago from intergaf, so I think I'll give a couple holograms a shot tonight or tomorrow night..

Your examples look *awesome* I'll be happy if I can even see a hologram with my first attempt.

Thanks for keeping us updated on this, its got my interest! :beer:

mendnwngs said:

Your examples look *awesome* I'll be happy if I can even see a hologram with my first attempt.

Click to expand...

Do yourself a favor and find a light proof container to put the plates in. They come wrapped in black/red paper in pairs of two. There's no easy way to take one out, not let it touch anything, and fold up the otherone so the paper never rubs against the emulsion. So if you have a light tight clean container you can just put the lot in there and it will save a lot of fumbling around in the dark.

Really you should use only 1 plate for your first try (don't be stupid like I was and try 4 plates at first totally wasting them) and make it an exposure test plate. Basically you set up your scene and partially cover the plate vertically with a piece of index card or something else opaque, thin, and straight - leaving about 3/4 of an inch exposed. You expose for 1sec, block the laser again, move the index card 3/4", expose 1 sec, and repeat until the entire plate is exposed. This gives varying exposures in vertical bands of 1sec each. Develop the plate and see which worked best then go with that exposure time. I tried 4sec @ ~100mW and it was far overexposed. I ended up making a pulse circuit to give precise 1second exposures to drive my DIY laser. I'll be making a thread about it later.

If you're using a 5mW laser you don't need to do this but these plates are super sensitive at >50mW.

This is very cool you should tell more about the process as I'm sure other people will want to follow in your foot steps

Oh, I was planing on processing the film plates in my plate tank (its lightproof) and probably transporting them in the same manner.

Ooh, and good idea with the exposure plate.. I actually have a wheel with different ND filtering levels 1/2, 1/4, 1/8 1/16 and so on. Its meant for B&W printing.. Place the wheel on the print, expose for whatever time you think, then look for the appropriately exposed "spoke" off the wheel.. You can figure out your timing, anf F:stop info for the enlarger from 1 print. I think I'll see if I can apply that tool to holograms..

(I had / have a B&W darkroom setup, but no real darkroom at the moment. Used to do a lot of 4X5 sheetfilm with my graflex press camera.) Still have a few boxes of 4X5 film in the fridge. That Fuji Velvia color slide film is stunning to look at a 4X5.

Ah, I'm preaching to the choire then, haha. Very nice, holography was/is my first stint into any real form of photography. I converted my office to a mock darkroom, haha, it works well.

So, I just read that Flogged: You let your laser "warm up" for ~15 min before capturing the hologram?

I wanted to make sure my setup would remain stable for 15+ minutes, so I just ran a test.. Over 20+ minutes with my laserbee.. The laser peaked at 107mW, but after 20 minutes was at 104-105mW, so, it seems pretty stable..

I'm getting all excited to try this now, LOL..

I'm lazy, so I went with a Mohgasm "Just add a diode" kit with the driver set at 200mA.

Oh, and full disclosure, My laserbee thermopile was wiped with something, so its not a pristine surface.. The measurement is not callibrated, and most likely low, but it works fine for showing output stability..

After 20 min, the host didnt even feel warmer than room temp to the touch.

It's not the output intensity that matters, but the wavelength. You let it warm up for a while so the wavelength is stable. Basically you're relying on the host to find a thermal point where the net loss and gain of heat reach equal. It isn't important what the wavelength is, just that it not change during an exposure. The other route is to control the temperature of the diode precisely with cooling to keep the wavelength constant - which is what I have been doing. I'm using a 3.8mm diode in a 7mm module - the duty cycle is fixed at 60seconds so a long warm up is not possible for me.

I do have a couple TECs, and even a couple PID temp controllers (from another project. Converting chest freezers into beer lagering coolers)

Might be something to play with eventually.. Hmmm...:thinking:

Man, I can see how one could get *way* into geeking out on this.. My mind is spinning thinking about it..

Hehe, totally.

I underestimated it the first time and I'm not going to again. I ordered 12 plates which should arrive on tuesday. I'll be locking down every variable I can trying to get a sucessful hologram. I've only made one to date out of the 6 initial plates, and it only partially came out; total bummer.

mendnwngs said:

Very cool!

I finally got a C-6 host in for my LPC-826, and a 200mA driver..

Just got back from a week in Tampa (work) last night, and built the laser this morning.

It peaks at 105mW on my LPM, and stays @105 for a solid 2 minutes before I gave up, and turned it off, so it seems pretty stable. (that was with AR coated glass, so without the glass the actual laser output could be higher?)

I received the plates, and chemistry a couple weeks ago from intergaf, so I think I'll give a couple holograms a shot tonight or tomorrow night..

Your examples look *awesome* I'll be happy if I can even see a hologram with my first attempt.

Thanks for keeping us updated on this, its got my interest! :beer:

Click to expand...

Yeah I'm going to be creating some more holograms this evening. Sunday nights are good, not much traffic. I will attempt some living objects, food and plants. I'm still experimenting.

Unbelievable, this kind of "simple" setup produces such wonderful results. Great job! Well done!

Very nice clean results there!