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Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
I've been wondering,
what has been holding back the use of Lasers for projection of DLP, LCD, etc? I can understand the loss of light in LCD, and the price, but it seems like there might be more problems than that.
I have been thinking about building a 35mm Film Projector for my new collection, and using three 1W lasers for illumination (this idea came into my head after thinking of things to do with my new 1W 445nm laser)... If I could get a laser unit working, it should solve most of the problems 35mm projector's illumination has (unbelievable amounts of heat, power consumption, etc etc)
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Green is expensive. The quest for bright green light has been long and hard, and we barely have commercially viable direct injection 510 nm diodes yet. A watt of 532 will run you ~1K from sketchy Chinese manufacturers, and well into the five figures from a company like Coherent. Also, it turns out that 3W of light is not a lot of light. The Casio DLP projectors that people love gutting diodes out of uses 20 of them for the G and B components. Giant theater projectors use 10KW arc lamps, which output roughly 5KW of visible light in a beautiful, bright white. In terms of visible light sources, it doesn't get more efficient than a xenon arc...even the state of the art 808 diode arrays are only marginally more efficient.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
bwang wrote ...
Green is expensive. The quest for bright green light has been long and hard, and we barely have commercially viable direct injection 510 nm diodes yet. A watt of 532 will run you ~1K from sketchy Chinese manufacturers, and well into the five figures from a company like Coherent. Also, it turns out that 3W of light is not a lot of light. The Casio DLP projectors that people love gutting diodes out of uses 20 of them for the G and B components. Giant theater projectors use 10KW arc lamps, which output roughly 5KW of visible light in a beautiful, bright white. In terms of visible light sources, it doesn't get more efficient than a xenon arc...even the state of the art 808 diode arrays are only marginally more efficient.
I see, well I guess once you try to break a point up it gets harder to picture how much there is to work with, but the casio gives me an idea... maybe using the whole light array from one of those for a small personal screening room situation.
It just so happens that right after I posted this, I looked on craigslist and found a full 35mm Projection setup, with platters, head, intermittent, lens, Doldy Digital processor, and lamp house free to the taker at a local theater.
I might talk to my university's engineering department to see if they'd let me try it out, they some of the professors love to help with student projects...
may not be the brightest thing, but if I can get a decent picture without the absolutely massive lamp house it might be worth a shot.
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Laser Projection
