Lens for BR laser.

• Jun 24, 2009

• #1

L

Low-Q

0

Joined

Dec 14, 2008

Messages

107

Points

0

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

 

• Jun 24, 2009

• #2

k1kb0t

0

Joined

May 12, 2009

Messages

454

Points

0

Look in the B/S/T section ...

http://laserpointerforums.com/f39/fs-405-g-1-glass-lens-mod-28-increase-vs-aixiz-22497.html


Jon

 

• Jun 24, 2009

• #3

LarryDFW

0

Joined

Dec 6, 2008

Messages

1,581

Points

63

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

 

• Jun 24, 2009

• #4

k1kb0t

0

Joined

May 12, 2009

Messages

454

Points

0

I could not find your thread for the life of me Larry. Your thread should be a sticky in the B/S/T section also.

http://laserpointerforums.com/f39/fs-hi-power-ar-lens-25-30-increase-vs-aixiz-22493.html

Jon

 

• Jun 25, 2009

• #5

L

Low-Q

0

Joined

Dec 14, 2008

Messages

107

Points

0

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: Jun 25, 2009

• Jun 25, 2009

• #6

Krutz

0

Joined

Nov 21, 2007

Messages

1,733

Points

48

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

 

• Jun 25, 2009

• #7

L

Low-Q

0

Joined

Dec 14, 2008

Messages

107

Points

0

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

 

• Jun 26, 2009

• #8

Hemlock_Mike

0

Joined

Jan 7, 2007

Messages

6,309

Points

83

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

 

• Jun 30, 2009

• #9

LarryDFW

0

Joined

Dec 6, 2008

Messages

1,581

Points

63

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

 

• Jun 30, 2009

• #10

Tech_Junkie

0

Joined

Jan 2, 2009

Messages

11,800

Points

0

Low-Q said:

Then I have to buy a BR burner first. That will be a rather expensive lens

Click to expand...

You can find PHR sleds for under $10. Its not a burner but people are using them. Plus you get the diode to play with.

Check this...http://laserpointerforums.com/f51/achieving-smaller-beam-diameter-803t-optics-37029.html

 

Last edited: Jun 30, 2009

• Jul 2, 2009

• #11

Darkarmyofone

0

Joined

May 12, 2009

Messages

1,403

Points

0

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

Dark

 

• Jul 2, 2009

• #12

Gryphon

0

Joined

May 4, 2009

Messages

2,234

Points

83

LarryDFW said:

k1kb0t;
Also, some talented machinists have engineered new lens mounts that reduce the play when focusing the lens

Click to expand...

Now who could have done that

 

• Jul 2, 2009

• #13

LarryDFW

0

Joined

Dec 6, 2008

Messages

1,581

Points

63

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: Jul 5, 2009

• Jul 2, 2009

• #14

Darkarmyofone

0

Joined

May 12, 2009

Messages

1,403

Points

0

wow, misterwilling is a good guy, nice to work with.

props to him for making it possible!

are they for sale?