Blu-ray. Brighter than Red laser at equal power??

[Phazonx]

I just got my aixiz module today and installed it into my soon-to-be blu-ray ponter. Right now I'm playing with cheap 5mw red laser.

Is a blu-ray as bright as a red of equal power?

 

[Deleted member 13229]

Re: Blu-ray. Brighter than Red laser at equal powe

Here's a picture for dot comparison:

The blu-ray dot isn't much brighter than a good 5mW red, but the blu-ray beam in a dark room is WAY brighter than a 5mW red. It's even brighter than my DIY reds (easily >100mW) I don't know why the blu-ray beam is so bright, one weird thing you will notice when looking at the blu-ray beam at night is that you will see no color in the beam. Unlike the green and red laser beams, you can't see any color in the blu-ray beam, just a line of gray.

 

[pwnstar]

Re: Blu-ray. Brighter than Red laser at equal powe

ahhhh i cant wait to get my bluray laser running!
lol

 

[pseudonomen137]

Re: Blu-ray. Brighter than Red laser at equal powe

Styro, that ain't a blu-ray dot. That's a blue dot . A blu-ray dot would be much more faint than a red. However, white paper, especially that very white stuff, has chemicals in it to make it fluoresce blue easily to appear more white. Therefore you're looking at a bright blue dot from fluorescence.

 

[CL_]

Re: Blu-ray. Brighter than Red laser at equal powe

wow, that sounds sooooo cool. Man I would love to get a blu ray. Maybe the beam is grey because there is nothing for the light to luminesce? Ha, it is like a black light in more than one way.(hints at the beam being grey)

Styro, that ain't a blu-ray dot. That's a blue dot . A blu-ray dot would be much more faint than a red. However, white paper, especially that very white stuff, has chemicals in it to make it fluoresce blue easily to appear more white. Therefore you're looking at a bright blue dot from fluorescence.

maybe it is just the camera?

 

[MarioMaster]

Re: Blu-ray. Brighter than Red laser at equal powe

here's a pic that shows the actual color a bit better

shining it on white paper makes a bright blue color

 

[pseudonomen137]

Re: Blu-ray. Brighter than Red laser at equal powe

[quote author=pseudonomen137 link=1205464404/0#3 date=1205465414]Styro, that ain't a blu-ray dot. That's a blue dot  . A blu-ray dot would be much more faint than a red. However, white paper, especially that very white stuff, has chemicals in it to make it fluoresce blue easily to appear more white. Therefore you're looking at a bright blue dot from fluorescence.

maybe it is just the camera?[/quote]
Nope!
(get a blu-ray and you'll see what I mean. Its actually a bit hard to find things that wont fluoresce at all)

 

[Razako]

Re: Blu-ray. Brighter than Red laser at equal powe

For those who don't have a blue ray this is what people mean by fluorescence.
[media]http://www.youtube.com/watch?v=bHOqDnE9EI0[/media]

 

[mikeeey]

Re: Blu-ray. Brighter than Red laser at equal powe

For those who don't have a blue ray this is what people mean by fluorescence.
[media]http://www.youtube.com/watch?v=bHOqDnE9EI0[/media]

is that glow in the dark paint? thats awesome! cant a green do the same thing tho?

 

[Razako]

Re: Blu-ray. Brighter than Red laser at equal powe

[quote author=Razako link=1205464404/0#7 date=1205468346]For those who don't have a blue ray this is what people mean by fluorescence.
[media]http://www.youtube.com/watch?v=bHOqDnE9EI0[/media]

is that glow in the dark paint? thats awesome! cant a green do the same thing tho?[/quote]
See my sig for info about the laser used in the video. Btw green lasers can cause a fluorescence effect when they hit certain rare objects. I have a couple of things that give off orange/redish glows when hit by 532nm.

 

[Phazonx]

Re: Blu-ray. Brighter than Red laser at equal powe

yeah, I noticed that and thought it was strange.

I thought there was hidden orange in the green beam, but your thoughts make more sense.

 

[Deleted member 13229]

Re: Blu-ray. Brighter than Red laser at equal powe

Styro, that ain't a blu-ray dot. That's a blue dot . A blu-ray dot would be much more faint than a red. However, white paper, especially that very white stuff, has chemicals in it to make it fluoresce blue easily to appear more white. Therefore you're looking at a bright blue dot from fluorescence.

Fluorescence is the only way I can get my camera to pick up a dot from a blu-ray laser! Otherwise all I got is a faint spec. So yes, I cheated and pointed the blu-ray at the box the assembly came in!

 

[Crossfire]

Re: Blu-ray. Brighter than Red laser at equal powe

Here's a picture for dot comparison:

The blu-ray dot isn't much brighter than a good 5mW red, but the blu-ray beam in a dark room is WAY brighter than a 5mW red. It's even brighter than my DIY reds (easily >100mW) I don't know why the blu-ray beam is so bright, one weird thing you will notice when looking at the blu-ray beam at night is that you will see no color in the beam. Unlike the green and red laser beams, you can't see any color in the blu-ray beam, just a line of gray.

The blu-ray beam is bright due to Rayleigh Scattering, the same effect that makes the sky blue.  I also see a ghostly gray beam from my laser (~11.6mW) with a little dark adaption.  It might look grey since the 405nm isn't too visible and dark adaption leads to scotopic vision, with reduced color sensitivity.

 

[Switch]

Re: Blu-ray. Brighter than Red laser at equal powe

If the Rayleigh Scattering thing is true, then it shouldn't matter if you're looking towards the beam or away from the beam.Also , Rayleigh scattering is taken over by Mie scattering when in dense fog or smoke.

Btw , I don't have a blu-ray, but a violet LED (I think it's ~395nm) looks blue to my webcam , even when it looks purple to me(not fluorescing)

 

[Milos]

Re: Blu-ray. Brighter than Red laser at equal powe

[quote author=clwatkins10 link=1205464404/0#4 date=1205465551]
[quote author=pseudonomen137 link=1205464404/0#3 date=1205465414]Styro, that ain't a blu-ray dot. That's a blue dot . A blu-ray dot would be much more faint than a red. However, white paper, especially that very white stuff, has chemicals in it to make it fluoresce blue easily to appear more white. Therefore you're looking at a bright blue dot from fluorescence.

maybe it is just the camera?[/quote]
Nope!
(get a blu-ray and you'll see what I mean. Its actually a bit hard to find things that wont fluoresce at all)[/quote]

Pseudo is correct. Any bright white paper will reflect 405nm light as bright light blue (I'd say as high as 480nm) and will seem brighter than red.
But to answer question, yes, practically speaking blueray beam/dot at lets say 30mW will appear as bright as a 100mW or more of 658nm. Even though eye cannot see 405nm well, it good chance you will be seeing some floresing of particles in the air or humidity/fog and will appear brighter than your red at similar power.

cheers