Blue laser 445nm

[Pitts]

HI guys,

Good input...thank you... I'm pleased to see that way more experienced bods than me are starting to question this !!..

Its why I have struggled with the good "old" one size fits all formula being applied to the basic red, green blue thing,

Tocket... the formula I was referring to in your name was the one you assumed.. it helps heaps.

Couple that with the link that Jem posted in this thread... troll through that and at least as a "non" optical guy you can start to follow this.
Leaving the fine details to you far more knowledgeable scientists.

I am starting to lean toward leaving the 475 in and getting the 445 and letting Mr Pangolin do the work maybe ?

At least with some debate happening here I am pleased that I am not alone thinking its "all a bit strange" given what we have been told in the past.

Here is part of Jems link which shows the idea.. its all about Cones and rods etc etc..
The Color-Sensitive Cones

In 1965 came experimental confirmation of a long expected result - there are three types of color-sensitive cones in the retina of the human eye, corresponding roughly to red, green, and blue sensitive detectors.
Painstaking experiments have yielded response curves for three different kind of cones in the retina of the human eye. The "green" and "red" cones are mostly packed into the fovea centralis. By population, about 64% of the cones are red-sensitive, about 32% green sensitive, and about 2% are blue sensitive. The "blue" cones have the highest sensitivity and are mostly found outside the fovea. The shapes of the curves are obtained by measurement of the absorption by the cones, but the relative heights for the three types are set equal for lack of detailed data. There are fewer blue cones, but the blue sensitivity is comparable to the others, so there must be some boosting mechanism. In the final visual perception, the three types seem to be comparable, but the detailed process of achieving this is not known.





Anyway guys keep the flow going I would really love to understand the basics here I suspect quite a few others may need to re think matters as well.


Many thanks for your input so far..


Cheers


Ray
NZ

[The_Doctor]

I wish I could but I don't know nearly enough. I can see that the 2% of cones that are sensitive, and to blue light, would be why Steve Roberts mentioned a risk to colour sensitivity when overexposed to shortwave light, but the business of mixing vs perception of intensity of unmixed primaries of various wavelengths still leaves me wanting. It's something I'd normally try to resolve by observation but I haven't got the right conditions for it, it needs a lot of sources to try, and ways to vary their mixes. Apart from that I only have information. It's like trying to understand chemistry from an O level text book and no lab and few chemicals, so I won't be able to do it.

[Zoof]

Just noticed CNI is started selling 445nm lasers up to 10mW. Still a good sign though.
http://www.cnilaser.com/PDF/MDL-III-445.pdf

[allthatwhichis]

I have heard rumors of other companies will be here soon also.

[FourDee]

8mrad divergence !! It's a flashlight

[mixedgas]

hope they bought a lot of them to get the price down.. Cause I got quoted 2700 for ONE 200 mW multimode diode. And that was with the sampling discount. The sampleing discount came because I called from a phone at a defense contractor. I had authorization to ask from the DC, they wanted one too.
In the US, Power Technology and Coherent are the licensed distributers.
Steve Roberts

[Pitts]

Hi all..

Many thanks for the feedback on this subject... have got a few feelers out with some manufacturers..

However as part of my ongoing "research" into combining 445 and 473 I came across this at Semrock's site..
May be of some use possibly ??

That is after you raise a mortgage..

Just thought I would share in case anyone else is wanting to do same. I am awaiting confirmation from them that is really suitable for this job.

By the way these Optics websites are amazing places to visit they have good tech articles and neat graphing capabilities as above. In some you can even design your own ....
Like www.semrock.com

Cheers

Ray
NZ
01-466-25

Filter Information Part NumberLM01-466-25 Reflection Band439.0 nm - 457.9 nm Passband473.0 nm - 647.1 nm Size (Diameter x Thickness)25 mm x 3.5 mm Price$195

Transmission data measured with unpolarized light at 45 degrees incidence.

To order or for more information, contact us by email or by calling 866-SEMROCK

Most products ship on the next business day

[buffo]

Hi Ray;

Looking at the picture you posted, are you sure that's the same product we talked about on the phone? Because the graph appears to show a notch filter with a reflective band (or absorbtion band, hard to tell) above 500 nm... Not sure how that's going to help you mix 445 and 473 though.

Adam

[Pitts]

Hi Adam..
Looks like the graph didnt do its copy thing properly.. The text is right but the graph is wrong.

I'll try again.

Thanks

Ray

[buffo]

Ahhh... That looks much better! So these run about $190 or so each, eh? Kinda steep, but it does appear to be just the thing to mix 445 and 473...

Have you decided yet if you're going to try it?

Adam