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FrozenGate by Avery

Lens for BR laser.

L

Low-Q

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Dec 14, 2008
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Hi,

I wonder where you buy glass lenses for my 405nm laser. I already have a couple of glass lenses, but they absorb much of the energy. I can see the lens actually lit from greenish ro redish where the beam is passing. An acrylic lens does not absorb the light, but the focal distance is changed depending on temperature. So I need a glass lens that is not absorbing energy from my laser. Anyone?

Br.

Vidar
 





k1kb0t;

Asphericical glass lenses coated for 405nm...
will deliver the most power from your Blu-Ray diode.

Also, some talented machinists have engineered new lens mounts that reduce the play when focusing the lens.

LarryDFW
 
Thanks for your answers. I did recently ask the seller "lasers4u" on ebay for the shipping cost to Norway. Hopefully I can order a couple of those soon. These lasers would be good as burning lasers with two lenses in a row. One collimating lens and then a focal lens - just configure them opposite of each other. If I loose only 8 - 10% power of 150 - 200 mW, and have a focal length of less than 3mm, it should burn something :)

Btw. have you tried to use those tiny focal lenses they use for 808nm lasers in DPSS lasers? I have tried it, but it seems they break, or got dusty for nothing. These lenses are very small, and have a focal length of less than 1mm.

Br.

Vidar
 
Last edited:
for a cheaper way, you could try the objective lens of a bluray drive. obviously, they are coated for 405nm ;-)
the focal length is the regular blu-ray working-distance, 0.8mm. flat side directed to the diode. mixed results, some people got nice results, some others got a ringy dot.. good luck!

manuel
 
Krutz said:
for a cheaper way, you could try the objective lens of a bluray drive. obviously, they are coated for 405nm ;-)
the focal length is the regular blu-ray working-distance, 0.8mm. flat side directed to the diode. mixed results, some people got nice results, some others got a ringy dot.. good luck!

manuel
Click to expand...
Then I have to buy a BR burner first. That will be a rather expensive lens ;)

I'll wait till I got an answer regarding shipping cost of two 408nm coated glass lenses. I bet that is cheaper.

The ringy dot is due to the short focus length as the focused dot in a given distance will suffer from interference - The shorter focus length between LD and lens, the bigger interference rings you get, the greater beam divergence you get. The great beam divergence multiply the interference effect at shorter distances.
You will also have a ringy dot with a much longer focus length as well, but at greater distances.

DPSS lasers does not suffer from this ringy dot-interference as the beam is more narrow than the diameter of the aperture.

Vidar
 
Q --
The g-1 lens will focus very close and burn. It will also focus easily at 20' and beyond. Why do you need another lens?

Mike
 
Low-Q;

Aspherical high NA lenses coated for 405nm will give you a very sharp focus point ...

or a well-collimated beam at a distance.

LarryDFW
 
i bought from "lasers4u", not the best service, and parts could be given MUCH more care.

Dark
 
Actually ....

It was MISTERWILLING who had the machining ability & numeric control machines ...
to contract the machining for the the lens housings with better threads .

LarryDFW
 
Last edited:
wow, misterwilling is a good guy, nice to work with.

props to him for making it possible!

are they for sale?
 
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