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Old 08-13-2010, 04:22 PM #1
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Default new lens

i broke the lens on my green 95mw viper and i put an old lens off my rifle scope which i wrecked years ago ,now the beam is so much thinner its great. from a distance of 75 meters the dot is now id say easily 5 times smaller on target and the beam seems to hit objects further away than the original.




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Old 08-13-2010, 04:27 PM #2
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Default Re: new lens

video of beam and dot?
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Old 08-13-2010, 05:13 PM #3
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Default Re: new lens

i tryed to take some video but it comes out too dark i spent 30 mins looking thru the manual its a panasonic LUMIX DMC-TZ15 .
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Old 08-13-2010, 06:34 PM #4
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Default Re: new lens

I have a cheap scope that came with a pellet gun, did you use the whole scope or just part of it? Which part, if you only used part of it?
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Old 08-13-2010, 08:07 PM #5
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Default Re: new lens

[QUOTE=kcorbhv;764674]i broke the lens on my green 95mw viper and i put an old lens off my rifle scope which i wrecked years ago ,now the beam is so much thinner its great. from a distance of 75 meters the dot is now id say easily 5 times smaller on target and the beam seems to hit objects further away than the original.



Now go and spend a little money and buy a * Plano-convex VIS 0 AR coated lens of the same focal length or close to it. The reason being is you are losing light output because that lens is not AR coated or is broadband coated. BTW what you've discovered by accident is you've made a higher power beam expander. What is the size of the beam at 33 feet = [10 meters] ?

* TECHSPEC® VIS 0° Coated Plano-Concave (PCV) Lenses - Edmund Optics
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Old 08-14-2010, 11:56 AM #6
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Default Re: new lens

i measured the beam at 4 meters it was 1.5mm
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Old 08-14-2010, 11:58 AM #7
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Default Re: new lens

Quote:
Originally Posted by BShanahan14rulz View Post
I have a cheap scope that came with a pellet gun, did you use the whole scope or just part of it? Which part, if you only used part of it?
it unscrewed out of one end of the scope after i pulled it apart,its approx 2cm in length and diameter
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Old 08-14-2010, 12:10 PM #8
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Wink Re: new lens

This is, basically, the same principle of how a beam expander works.

A beam expander first expand the beam to a more large diameter, then re-focus it with a bigger lens, for have a better divergence.

When you broke the front lens of your module, you remained with the beam passing through the first element, that is a negative lens, that expand it ..... then, focusing it with the larger lens, more distant from the expander than the original one, you got virtually a "built-in" expander
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Old 08-14-2010, 12:22 PM #9
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Default Re: new lens

Quote:
Originally Posted by HIMNL9 View Post
This is, basically, the same principle of how a beam expander works.

A beam expander first expand the beam to a more large diameter, then re-focus it with a bigger lens, for have a better divergence.

When you broke the front lens of your module, you remained with the beam passing through the first element, that is a negative lens, that expand it ..... then, focusing it with the larger lens, more distant from the expander than the original one, you got virtually a "built-in" expander
yes ,when the laser was stock the beam started thin and went wider ,now it starts fatter and becomes thinner over 2 meters its divergance was 1mm

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Old 08-14-2010, 12:34 PM #10
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Default Re: new lens

Quote:
Originally Posted by kcorbhv View Post
yes ,when the laser was stock the beam started thin and went wider ,now it starts fatter and becomes thinner over 2 meters its divergance was 1mm
divergence is measured in Mrad's (milliradians) not mm

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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 08-14-2010, 12:36 PM #11
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Default Re: new lens

Quote:
Originally Posted by laserboystuart View Post
divergence is measured in Mrad's (milliradians) not mm

stuart
oh sorry its not the beam diverghance its 1mm beam diameter right?

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Old 08-14-2010, 12:46 PM #12
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Default Re: new lens

Quote:
Originally Posted by kcorbhv View Post
oh soo whats 2mm converted into milliradians?
use this calculator...
pseudonomen137's JScript mRad Calculator

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Quote:
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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 08-14-2010, 01:05 PM #13
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Default Re: new lens

Quote:
Originally Posted by laserboystuart View Post
use this calculator...
pseudonomen137's JScript mRad Calculator

stuart
Your laser has a divergence of 0.2499999947916669 mRad
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Old 08-14-2010, 06:27 PM #14
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Default Re: new lens

Quote:
Originally Posted by kcorbhv View Post
i measured the beam at 4 meters it was 1.5mm
You really need to measure the beam diameter at at least 33 feet [10 meters]. I would measure the beam at 10 meters 15 and 20 meters. There's a reason for doing so. I'll explain why if you like to know.

Quote:
Originally Posted by kcorbhv View Post
yes ,when the laser was stock the beam started thin and went wider ,now it starts fatter and becomes thinner over 2 meters its divergance was 1mm
If the beam is really becoming thinner with distance then what is occurring is the beam is focused to about 2 meters [ 6 feet ]. The beam is not collimated for lowest divergence.
Have you measured the beam as it exits the lens and at 2 meters ?
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