Why can we not make an 550nm green laser, for visual laser shows, this wavelenght should be optimal for the human eye !
Then these wavelenghts should not be so strong !
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Why can we not make an 550nm green laser, for visual laser shows, this wavelenght should be optimal for the human eye !
Then these wavelenghts should not be so strong !
In short ?
Because the advantage of enhanced visibility is totally outweighed by the disadvantage of the cost of making a specific wavelength laser.
Due to its small market, the laserdisplay-industry tends to end up with lasers that were specifically developed for other purposes.
Actualy the peak of the photopic curve (eye response) occurs at 555nm.... Maybe that is the better wavelength to your point... However +/- 3nm isn't oing to buy you much at the position on the curve. :)Quote:
Originally Posted by Kenneth Hansen
Always good to ask questions and pose a challenge :)
Making green light is hard enough as it is with DPSS technology. You are not free to pick your wavelength with this type of laser as you need to find an ion with emission in the right place.
Besides, I don't think 550 nm makes a very nice green color - it's too far to the yellow.
Another thing to consider is that in dark your eyes are more sensitive to around 500nm's, and really.. Who does laser shows in bright conditions?
--Hydro15
With LED walls multiplying at a insane rate, more often then you might think.Quote:
Originally Posted by hydrogenman15
Peace,
Steve
I dare to question that with 445nm blue, since video projection is also a display purpose, and 445nm blue was chosen for its visibility by the human eye.Quote:
Originally Posted by -bart-
In contrast to the 532 we got 'for free' with 1064nm YAGs or 660nm which was chosen because of better interaction with DVD substrates.
True, but even 445 is a trade-off between visibility and achieved color-space.
Besides that, there are lots of criteria that make a laser successful or even suitable for laserdisplay.
Is solid state?,is it portable?, is it scalable?, can it be directly modulated? , is it power efficient?, lifetime ? maintenance ? weight ? toxicity of materials?, price? beamspecs?
Good visibility is just one of them.
Was the dvd diode specifically 'chosen' to match the substrate of a dvd ?
OR
Was the dvd substrate developed to match a laser diode that could be easily mass produced ?
our scoptic vision is sub 500nm. which is where/when we use our lasers.
michael.
[QUOTE=Stoney3K;173405]I dare to question that with 445nm blue, since video projection is also a display purpose, and 445nm blue was chosen for its visibility by the human eye.
Your close,
We got 445 because 460-480 was unreachable in the development lab at the time.
Steve
You might wish to consider the not so well known "mesopic" vision instead.Quote:
Originally Posted by chipdouglas
In other words some scotopic and some photopic vision at the same time.
Steve
like in dusk conditons? are projectors used much at sunset?Quote:
Originally Posted by mixedgas
No, but they are frequently used in venues that have other lighting present.Quote:
Originally Posted by chipdouglas
Truly scotopic vision would only occur in a completely darkened room. Meoptic vision, on the other hand, is what you'd have in just about any nightclub, with the dance floor lights, the moving fixtures, and a few house lights on but dimmed...
Adam
At the time? Are you implying there are lab setups doing 460-480nm straight from a diode?Quote:
Originally Posted by mixedgas
Interesting times are ahead...
Quote:
Originally Posted by buffo
Touche...
15character min.
Nichia is releasing longer wavelengths in high power soon. It will probably be on the 2500$ per device model, not the flood the market with licensed clones model.Quote:
Originally Posted by Stoney3K
Go here, click "Agree":
http://www.nichia.com/en/product/laser.html
NDS4113 is interesting, to say the least.
I've been waiting 20 years to get my hands on a 460-480 nm diode with Tem00, I can wait a few more.
Steve
yeah i spoke with tonto in melbourne a few weeks ago.
they also have a 510nm working in about 50mw.
the 460nm will be out within 6 months he says.
and it will do 1 watt :)
aijii, I just deleted my original post because I noticed I'd missed read the range specs on that diode.
How controllable is the exact wavelength as 460-480 is quite a wide range going from deep blue to light sky blue?
Is there anyway of controlling which end of the wavelength the diode actually puts out as I'm guessing a lot of people will prefer 460 over 480.
Is there anyway of controlling which end of the wavelength the diode actually puts out as I'm guessing a lot of people will prefer 460 over 480.[/QUOTE]
Prepare for the Binning charge.
Drift with temperature is small, perhaps a tenth of a nanometer per deg C. According to the data sheet. Thus there will be binning.
This will freak out some folks, but the raw diodes have actual FDA accession numbers listed on the web site.
Steve
Thanks for all to reply on my tread, verry interesting development :o
Regards Kenneth Hansen
Agreed. I may even hold off on 445 for the moment, and see how these Nichia diodes will pan out. They won't have a cheap launch price, but the 445nm's had a price tag of $500+ before Casio started purchasing them in bulk.Quote:
Originally Posted by mixedgas
1W of 460-480nm is going to be stupendously bright, I don't recall having ever seen a 1W 473nm DPSS, only a few 1W 488nm argon tubes.
Hawk-eyeing this for sure.