Parabolic lens

[Arayan]

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...

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

 

[regalis]

For a few pictures the low VLT should be no problem i think..but don't fry your cam! :thinking:
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

 

[Arayan]

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

 

[bobhaha]

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!

 

[regalis]

Absolute great work!
The spot looks realy nice and round...if the beamprofile looks the same this lens will be perfect for handheld beamcorrection! :wave:

 

[Arayan]

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!

:thanks: and yes, as I said few posts ago, this will be the next step

 

[Arayan]

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

 

[regalis]

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 :beer:
+rep when i allowed to

 

[Arayan]

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 :beer:
+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

 

[Ash]

How much power loss through this lens? Have you metered the laser after passing it through the lens?

 

[regalis]

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? :thinking:
Here are 5 different: Compound Parabolic Concentrators (CPCs) - Edmund Optics

 

[Arayan]

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

One question though: Do you know which lens you have?

This

 

[regalis]

Thanks
I found something strange...this is the only lens with a coating:

 

[Arayan]

Strange, but I'm not 100% sure that my lens is 441. No specifications on the case :thinking:

 

[regalis]

if your lens is ~3cm long it is the one with the coating (229)

 

[Arayan]

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...