Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Comparing the divergence at 80 feet with 445nm, 520nm, 532nm and 638nm

Alex2893

Alex2893

0
Joined
Jun 6, 2014
Messages
435
Points
43
I took this picture comparing 4 different wavelengths and there divergence and thought it turned out pretty good. I lined up my 445nm, 520nm, 532nm and my 638nm laser shinning on a shed door 80 feet away. I know before buying these lasers i was looking for a divergence comparison picture but could not really find any so i took my own :) and yes the divergence of the 638nm is really that bad but its an awesome color though so i dont mind
58792820-4224-48fe-bfcd-171bc3532cd0_zps76ffd1ce.jpg

From left to right is 532nm, 520nm, 445nm(m140 diode), and 638nm(new oclaro 700mw diode)
 
Last edited:





Alex2893

Alex2893

0
Joined
Jun 6, 2014
Messages
435
Points
43
and thats with a 3 element lens. they all have 3 element installed
 
W

Wmacky

0
Joined
May 4, 2014
Messages
163
Points
0
Holy moly, that oclaro looks like it's got a line filter installed? Thats a wonderfully informative comparison! Thank you!

I'd love the see a 445 5 watt dot in that mix. If it's anything like the Oclaro then I might have to pass.........
 
Last edited:
Shakenawake

Shakenawake

0
Joined
Mar 11, 2013
Messages
1,541
Points
83
I'd love the see a 445 5 watt dot in that mix. If it's anything like the Oclaro then I might have to pass
Click to expand...

It's not as bad, but worse than an old gen 9mm 445nm

Whoa... those olcaro diodes look even worse than the mitsu diodes. Euuhhh.
Click to expand...

they are nearly identical, I've owned both. I think the oclaro has more symmetrical wings though
 
Alex2893

Alex2893

0
Joined
Jun 6, 2014
Messages
435
Points
43
No line filter lol. The dash is 3 times as long as i was expecting. I thought it would be maybe double the length of the 445nm dash. I will say this however with in 10 feet the spot/dash is so intense i cant even look at it. It strains my eyes more then my 200mw 520nm and 1.7w 445nm. That makes sense because Tmack was telling me the longer wavelengths are reflected more and the shorter are absorbed more which is why 405nm burns best. Just placed an order for eagle pair that cover the red wavelength as they are needed !!! Already have my eagle pair that cover the over wavelengths :)
 
Last edited:
Shakenawake

Shakenawake

0
Joined
Mar 11, 2013
Messages
1,541
Points
83
longer wavelengths are reflected more and the shorter are absorbed more which is why 405nm burns best
Click to expand...

not sure about that. shorter wavelengths are more energetic, which is why gamma rays will devastate you while radio waves will not. visible light is a pretty narrow range, but I suppose 1W of 405nm might burn ever so slightly better than 1W of 650nm, it would be difficult to measure this difference, even once variables have been eliminated
 
Alex2893

Alex2893

0
Joined
Jun 6, 2014
Messages
435
Points
43
Shakenawake said:
not sure about that. shorter wavelengths are more energetic, which is why gamma rays will devastate you while radio waves will not. visible light is a pretty narrow range, but I suppose 1W of 405nm might burn ever so slightly better than 1W of 650nm, it would be difficult to measure this difference, even once variables have been eliminated
Click to expand...

Maybe the 1w 405nm burns better because its single mode and the focus point is much smaller then the focus point of the 1w multimode 638nm?
 
RYDorDIE278

RYDorDIE278

0
Joined
May 25, 2013
Messages
534
Points
28
red was goin to be my next 1w+ laser but whoa, might have to rethink that one! thankz for the comparison!
 
The Lightning Stalker

The Lightning Stalker

0
Joined
Aug 14, 2013
Messages
2,655
Points
63
If you had a Mitsu next to the Oclaro, you would see just how much worse the Mitsu actually is, as far as
the splash goes. Divergence is about the same, but Mitsubishis have much worse splash.
 
Tmack

Tmack

0
Joined
Oct 13, 2013
Messages
2,478
Points
0
Great shot Alex. I predict an update to this thread soon ;)
 
You must log in or register to reply here.




Top