is more visible a 450mw bluray beam or a 15/20mw true blue?

i would know..... if is more visible a powerfull 450mw bluray laser or a blue laser of about 15mw...or 25... can you compare it?.

not much people have blue laser.... but who have one.. can compare it to a bluray?

blue is good to see better the ray..... but thinking that a t the same price about.... of a 15mw blue... you can get a 450mw bluray.... what do you prefer?

bluray burn as HELL.... but what about visibility? i only have a 80mw bluray and i must say it is not so much visible AS I EXPECTED before to purchase it. the beam is only visible in almost complete darkness... and is comparable to a 2/3mw of green i think.

yes... the most attactive thing t o have is a FREAK 410/415nm at 450mw. yes... this could really be a wonderfull thing.... ...powerburning + much more visibility of any bluray.

but i think that is TOO MUCH $$$ to have a more than 405nm in a 8x diode...(who have freaks sell them at very high price i think)

Are you referring to 473nm or 450-460nm as true blue?

405nm is nearly invisible to us. The same power at 473nm should be orders of magnitude more visible. There's a visibility graph running around somewhere, I'll try to find it.

-Trevor

I think they should be about equal. 405nm is still kind of visible, and has a great beam. Blue is only a few times brighter.

will

Found the graph.



Response to 473nm vs. 405nm is much greater (according to the graph, many times). You should also take into account that a 473nm laser will have a tighter beam, making it easier to see. However, with the 450mW 405nm you have a whole lot more photons to work with.

Perhaps someone who owns lasers in these wavelengths (and powers) can advise you...

-Trevor

thanks twite for the graph.... but i know that for graphs... violet laser are QUITE INVISIBLE.. but it is not really true.... however.. my 80mw bluray is comparable to a 5mw green... however some user habe an 8x diode....at about 450mw... and i would know if for visibiliti is beter an 8x... ora blue laser at 15/20mw.... (more mw will cost to much for a comparative)

realista said:

thanks twite for the graph.... but i know that for graphs... violet laser are QUITE INVISIBLE.. but it is not really true.... however.. my 80mw bluray is comparable to a 5mw green... however some user habe an 8x diode....at about 450mw... and i would know if for visibiliti is beter an 8x... ora blue laser at 15/20mw.... (more mw will cost to much for a comparative)

Click to expand...

For me, BR lasers have a disproportionately bright beams. At least inside. You know how a green laser gets most of its brightness from dust and moisture and stuff in the air? my BRs don't look like that, it seems more like the diffraction off open air is very bright. So the beam itself is very bright, not the reflection for some reason. But I can't really observe this as much outside, it could just be me but I don't see this as much outside. Maybe there's something in my house that reflects BR well? We have high levels of radon, does that diffract 405 at steep angles or something?

will

Not taking into account Rayleigh scattering and fluorescence, blue is about 70 times brighter than violet. So 15mW should be about as bright as 1W of 405, but that's only in theory. That figure might be as low as 300 or so when other factors are considered.

@ossumguywill: If you have enough radon in the air around you to alter the air's diffraction of a laser beam, if I was you I'd get the hell out of there! High levels of radon gas will substantially increase your chances of all kinds of bad stuff...


Pete

Not taking into account Rayleigh scattering and fluorescence, blue is about 70 times brighter than violet. So 15mW should be about as bright as 1W of 405, but that's only in theory. That figure might be as low as 300 or so when other factors are considered.

Click to expand...

Keep in mind that optical response is not linear. 15mW of blue would appear 70x brighter than 15mW of violet.

Actually I think blue is only about 10x brighter according to the graph.

I based my estimation on 405 light having <1lm/W and 473 light having 70lm/W.