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Old 04-22-2011, 08:32 PM #1
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Default Which lens for Survival Laser?

I bought a Survival Laser bundle from Garoq, and there is a side-splash that quite a few 445nm lenses do have I believe.
I'm looking for a lens that will output a more uniformed dot with little to no splash.
I don't want a lens that will increase the power a lot but won't help in my issue, nor a lens which will decrease the power significantly.
I'm not sure what lens it came with but I remember reading 'AR coated glass lens'

I hope I'm not sending the wrong message here, the Survival Laser is a fantastic buy, it's a great laser and I strongly recommend it. It's just that I would really like an almost perfect dot.

for reading!


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Old 04-22-2011, 08:42 PM #2
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Default Re: Which lens for Survival Laser?

If the Survival Laser has the 3-element AR coated Aixiz (or equivalent) glass lens,
then that's about the best you can have.
For a "perfect" dot you'd need either a pair of prisms or a cylindrical lens.
Not very handheld-compatible...

These diodes just have a nasty beam profile, is all.
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Old 04-22-2011, 09:15 PM #3
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Default Re: Which lens for Survival Laser?

Even with a prism pair, you're not going to get a perfect dot, just more of a square output instead of rectangular. You simply won't get a circular dot from a multi-mode diode that isn't creating a circular beam.

Anselm is pretty much bang on. If you want this to still be a portable laser, 3-element AR coated Aixiz is the closest you'll get to a proper "dot".
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Old 04-22-2011, 09:15 PM #4
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Default Re: Which lens for Survival Laser?

Having said that, if you're seeing "splash" and not just "rectangular shape", your lens might just be dirty.
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Old 04-22-2011, 09:19 PM #5
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Default Re: Which lens for Survival Laser?

Quote:
Originally Posted by rhd View Post
Having said that, if you're seeing "splash" and not just "rectangular shape", your lens might just be dirty.
The case is not the dot, I know that is rectangular and I'm fine with that.
It is indeed the splash, and it's definitely not the lens because it's not just my unit, I think this kind of side splash is common with 445nm lasers.
I guess I'll just get used to it.
Thanks for your help!
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Old 04-22-2011, 09:21 PM #6
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Default Re: Which lens for Survival Laser?

All The New 3 element glass lenses that i have gotten have these side splash "wings". The old Ones did not have them as bad but they were there.

Not sure what causes this.
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Old 04-22-2011, 09:24 PM #7
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Default Re: Which lens for Survival Laser?

Quote:
Originally Posted by lazeerer View Post
All The New 3 element glass lenses that i have gotten have these side splash "wings". The old Ones did not have them as bad but they were there.

Not sure what causes this.
Yeah, that's exactly what I have with my Survival Laser!
Oh well, it's not even a major issue.
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Old 04-22-2011, 10:03 PM #8
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Default Re: Which lens for Survival Laser?

Quote:
Originally Posted by lazeerer View Post
All The New 3 element glass lenses that i have gotten have these side splash "wings". The old Ones did not have them as bad but they were there.

Not sure what causes this.
I think it might have something to do with the new coatings that are supposedly tailored for 445nm. They do seem to pass a few more mW than the old versions.
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Old 04-25-2011, 03:56 AM #9
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Default Re: Which lens for Survival Laser?

garoq love your laser burns everything not reflective thank you thank you you really helped me into a new very cool hobby. I've built 3 lasers since putting yours together you rule lpf rules thank you lpf never could have done it without you
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Old 04-25-2011, 05:30 PM #10
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Default Re: Which lens for Survival Laser?

Quote:
Originally Posted by yamaha rich View Post
garoq love your laser burns everything not reflective thank you thank you you really helped me into a new very cool hobby. I've built 3 lasers since putting yours together you rule lpf rules thank you lpf never could have done it without you
Hey thanks Yamaha, yes this is a great hobby and LPF is a fantastic resource!
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