Why not 550nm Green ?

[Kenneth Hansen]

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 !

[-bart-]

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.

[LASERGUY]

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 !

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.

Always good to ask questions and pose a challenge

[tocket]

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.

[hydrogenman15]

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

[mixedgas]

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.

Peace,

Steve

[Stoney3K]

In short ?

Due to its small market, the laserdisplay-industry tends to end up with lasers that were specifically developed for other purposes.

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.

In contrast to the 532 we got 'for free' with 1064nm YAGs or 660nm which was chosen because of better interaction with DVD substrates.

[-bart-]

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 ?

[chipdouglas]

our scoptic vision is sub 500nm. which is where/when we use our lasers.


michael.

[mixedgas]

[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