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



Laser Pointer Store

405nm AR coated collimation lens

15mgtar

New member
Joined
Oct 13, 2009
Messages
17
Points
0
can I use 405nm AR coated collimation lens for red and green laser diode?
 

LaserRX

New member
Joined
Apr 30, 2008
Messages
104
Points
0
Yes, but you will not get the lenses AR attributes effecting those wavelengths. It's best to get a lens designed for the wavelength you intend to use it on, or one that covers a range of wavelengths (again the ones you intend to use it on).
 

ElektroFreak

New member
Joined
Nov 7, 2008
Messages
5,728
Points
0
No. using a 405nm (violet) coated lens will result in unacceptable power loss at other wavelengths like red or green.
 

HIMNL9

New member
Joined
May 26, 2009
Messages
5,416
Points
0
^ other than this, green modules (cause i suppose you are speaking about DPSS modules, for green, and not pure diodes) have lenses with focal lenghts from 6 to 15mm, depending from the expander ..... a short 2 or 3mm FL for a green module is almost unhelpful, focusing it can become a nightmare :p
 

Krutz

New member
Joined
Nov 21, 2007
Messages
1,733
Points
0
the 405-g1 lens doesnt lose much with red at all!
the virtualvillage one is 5% better than stock aixiz, the 405-g1 is 5% better than the virtualvillage, and the red-coated meredith is only a few % better than the 405 one!
the 405-g1 is the one with the shortest focus available, so i chose it for my red built too. a few percent lost, but much higher powerdensity from the thinner beam.. worth for me, ymmw!

manuel
 

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,577
Points
63
Sean;

It depends on the type of AR coating on the lens.

I have Hi-Power lenses coated for 405nm and

the same lens coated for 400 to 800nm.

The first lens will work well for 532nm lasers.

It will even work for Red lasers with the loss of a few percent.

LarryDFW
 

LaserRX

New member
Joined
Apr 30, 2008
Messages
104
Points
0
Larry,

You're correct, though for optimal results an AR coated lens that includes the frequency being used is needed (you did mention that though). Others will work, and a few percent is probably not a big deal for the general hobyist. Just wanted to point out that there will be a difference, even if it is small.

Btw, I've looked at your projects, you do some fine work.
 




Top