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Old 09-28-2011, 05:27 PM #17
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Default Re: Parabolic lens

Quote:
Originally Posted by regalis View Post
Thanks for the pictures!
It looks beefier in the center with the parabolic lens..
Sorry to bother you, but do you have a second pair of goggles to take pictures with?
No problem and yes I have another pair of goggles for this wavelength but they have low VLT... BTW I'll try...

Quote:
Originally Posted by regalis View Post
Btw.: The flare on the top left is due to not 100% perfect alignment, right?
Yes, the lens holder is a bit arranged and it is not easy to align the beam with few time


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Old 09-28-2011, 05:41 PM #18
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Default Re: Parabolic lens

For a few pictures the low VLT should be no problem i think..but don't fry your cam!
Maybe wait till someone confirms this

The alignment is wonderful..no problem at all!
I just wanted to be sure it is the alignment and not some strange artefacts in the lens
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Old 09-28-2011, 06:03 PM #19
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Default Re: Parabolic lens

Quote:
Originally Posted by regalis View Post
I just wanted to be sure it is the alignment and not some strange artefacts in the lens
no, no only reflections due to the alignment


Attached Thumbnails
Parabolic lens-1.jpg   Parabolic lens-2.jpg  
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Old 09-28-2011, 06:09 PM #20
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Default Re: Parabolic lens

Can you place the safety glasses over the lens of the camera so we can see the beam profile?

It looks great so far! Keep up the good work!
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Old 09-28-2011, 06:21 PM #21
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Default Re: Parabolic lens

Absolute great work!
The spot looks realy nice and round...if the beamprofile looks the same this lens will be perfect for handheld beamcorrection!
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Old 09-28-2011, 06:26 PM #22
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Default Re: Parabolic lens

Quote:
Originally Posted by bobhaha View Post
Can you place the safety glasses over the lens of the camera so we can see the beam profile?

It looks great so far! Keep up the good work!
and yes, as I said few posts ago, this will be the next step
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Old 09-29-2011, 04:48 PM #23
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Default Re: Parabolic lens

I tried to take the pics with the safety glasses over the camera...unfortunately (in this case) the filters have OD>7.

Without the parabolic lens



With the parabolic lens
Attached Thumbnails
Parabolic lens-senza.jpg   Parabolic lens-con.jpg  
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Old 09-29-2011, 05:17 PM #24
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Default Re: Parabolic lens

Hey thanks for the pics of the spot!
What do you think, is the beamprofile much better with the parabolic lens?
It looks like but i can't tell for sure..(Unfortunately are the spots in the pictures pretty small.. )

But again thanks for your effort to help determine the usability of these lenses
+rep when i allowed to
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Old 09-29-2011, 05:30 PM #25
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Default Re: Parabolic lens

Quote:
Originally Posted by regalis View Post
Hey thanks for the pics of the spot!
What do you think, is the beamprofile much better with the parabolic lens?
It looks like but i can't tell for sure..(Unfortunately are the spots in the pictures pretty small.. )

But again thanks for your effort to help determine the usability of these lenses
+rep when i allowed to
I honestly don't know, the spot looks better with the lens, but around it I can see some reflections with certain loss of power... I don't know what to advise, BTW thanks for the Rep
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Old 09-29-2011, 06:09 PM #26
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Default Re: Parabolic lens

How much power loss through this lens? Have you metered the laser after passing it through the lens?
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Old 09-29-2011, 06:14 PM #27
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Default Re: Parabolic lens

That is what i wanted to hear
Power don't count...the beamshape is way more important. Would be epic to have a corrected 445nm build with a nice compact beam.
Thanks for your honest opinion!

One question though: Do you know which lens you have?
Here are 5 different: Compound Parabolic Concentrators (CPCs) - Edmund Optics
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532nm >> 100mW module without host
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Old 09-29-2011, 07:24 PM #28
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Default Re: Parabolic lens

I haven't measured the variation in power... next step

Quote:
One question though: Do you know which lens you have?
This
Attached Thumbnails
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>80 mW, 473 nm CNI-style handheld laser SOLD
160 mW, 532 nm, Optotronics pen SOLD
Focusable 150 mW, 532 nm
5 mW, 532 nm, Laserglow Anser
2 mW, 594 nm, Laserglow Rigel-2 SOLD
380 mW, 635 nm, the Copperhead by Wolfman Link
170 mW, 650 nm from jeffreythe00 Link
double beam pointer <5 mW, 650 nm ; 532 nm, Z-Bolt
<400 mW (220 mW) 808 nm Armlaser
KW-range 1064 nm pulsed YAG laser "gun" from AnselmoFanZero Link
40W, 10600 nm DIY CO2 laser Link
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Old 09-29-2011, 07:41 PM #29
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Default Re: Parabolic lens

Thanks
I found something strange...this is the only lens with a coating:
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Old 09-29-2011, 07:53 PM #30
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Default Re: Parabolic lens

Strange, but I'm not 100% sure that my lens is 441. No specifications on the case
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Old 09-29-2011, 08:23 PM #31
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Default Re: Parabolic lens

if your lens is ~3cm long it is the one with the coating (229)
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Old 09-29-2011, 08:37 PM #32
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Default Re: Parabolic lens

Quote:
Originally Posted by regalis View Post
if your lens is ~3cm long it is the one with the coating (229)
Now I can't measure it, but at rough guess, it's smaller than 3 cm...
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Focusable 150 mW, 532 nm
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2 mW, 594 nm, Laserglow Rigel-2 SOLD
380 mW, 635 nm, the Copperhead by Wolfman Link
170 mW, 650 nm from jeffreythe00 Link
double beam pointer <5 mW, 650 nm ; 532 nm, Z-Bolt
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