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Old 02-23-2013, 07:11 PM #1
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Default Beam Profile with G-2 for 405nm Request

So I know that the G-1 and G-2 lenses allow for greater power in 405 and 445nm lasers. And by a pretty large margin too!

So my 405nm laser is ~550 mW, but with a G-2 lens it would be over 700mW! But what I am curious of is how it makes the beam look....

So. Does anyone have a 405nm laser and a G-2 lens that they could try out to let me know what the beam profile is? Pictures would be especially helpful if they are clear. And of course, opinions are always welcomed!

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Old 02-23-2013, 07:18 PM #2
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Default Re: Beam Profile with G-2 for 405nm Request

The beam profile is very good still. I even like it better than with the Aixiz lenses.
Elliptical beam with low divergence.

I'm trying to find my pics but it is NOT bad at all.
You won't regret it.
Jayrob's sale thread for the lenses might have beam profile pics, too.

The one on the right is 405nm with a 405 G-1 Lens


Again on the right, this time at 30-40ft
~170mW 473, ~1W 445, ~450mW 405 fyi

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Old 02-23-2013, 07:27 PM #3
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Default Re: Beam Profile with G-2 for 405nm Request

That really isn't bad at all! I was worried because when I put my 9mm Stock Lens in front of my 405nm laser, it gets all wonky and doesn't focus right, so I was worried the G-2 Lens would be the same.
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Old 02-23-2013, 07:35 PM #4
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Default Re: Beam Profile with G-2 for 405nm Request

As the 405's PHR's and S06J's (not sure about the others though) are single modes, the output with a G lens or a 3 element lens is pretty much the same ie there is no real difference. The problem is with the MM diodes with a rectangular output profile.

I have used both G's, 3 elements with my 405's (and even acrylics, although not recommended with the PHRs) and saw no discernible difference with between them!

Edit: Beaten to it...
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Old 02-23-2013, 07:44 PM #5
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Default Re: Beam Profile with G-2 for 405nm Request

Isaac, here is a great deal on a G2-lense

Star trek phaser laser set *for sale
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405nm >> Wickedlasers SONAR by lazeerer peak@968mW
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473nm >> Optotronics RPL-B peak@112mW
515nm >> Skylasers HL peak@41mW
532nm >> Novalasers Alpha HP peak@284mW
589nm >> CNI PGL-III-A peak@89mW
594nm >> Laserglow Rigel peak@4mW
635nm >> MXDL by DTR peak@38mW
642nm >> Saillaser peak@23mW
660nm >> CR2 by lazeerer peak@524mW
685nm >> MXDL by lazereer peak@42mW

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Old 02-23-2013, 09:15 PM #6
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Default Re: Beam Profile with G-2 for 405nm Request

Thanks for that pink DJNY! Do you happen to know what a G9 lens is? He is selling that one at the same price so I am trying to decide between them. I am at work on my phone so using the search is difficult.
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Old 02-23-2013, 09:19 PM #7
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Default Re: Beam Profile with G-2 for 405nm Request

G9 is the lens that comes with the 9 mm diodes.
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Old 02-23-2013, 09:25 PM #8
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Default Re: Beam Profile with G-2 for 405nm Request

Ah...yeah that one just doesn't work with the 405 diodes.
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Old 02-24-2013, 12:41 PM #9
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Default Re: Beam Profile with G-2 for 405nm Request

oh yes it does isaac. it's what i have in my phobos 405 12x. it focuses to a fine spot. i had to use an extended barrel with it because the phobos head is threaded deeply. a lot of the lens barrel is "lost" into it. more length was needed to get the lens itself close to the diode.
the g1, g2 and g9 are pretty much identical.

see here 12x in a Phobos host
read my edits too
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Old 02-24-2013, 03:18 PM #10
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Default Re: Beam Profile with G-2 for 405nm Request

So if I have a G9, there is no reason to get the G-2? I tried the G9 again last night and I noticed I can get it to a focus, but outside of focus it looks bad. Whereas the glass lens I have makes a fine circle even when unfocused. I thought that was why the G9 didn't work.
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Old 02-24-2013, 04:06 PM #11
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Default Re: Beam Profile with G-2 for 405nm Request

you will notice the same "out of focus" appearance with any g series lens. imo the g9 is the best of the lot. so you already have the lens you need.
here's a ref.
Lens comparison with the 445nm H1600 diode
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Old 02-24-2013, 10:43 PM #12
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Default Re: Beam Profile with G-2 for 405nm Request

UPDATE: All of you have been rep'd to the full extent I am able to grant Thanks you all for the help and advice!
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Old 02-25-2013, 04:26 AM #13
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Default Re: Beam Profile with G-2 for 405nm Request

This has all been a great read and great advice for my upcoming 405nm build. +1 for all!
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Old 02-27-2013, 01:34 PM #14
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Default Re: Beam Profile with G-2 for 405nm Request

The reason the G-series lenses might create ugly looking spots is that they've got such a short focal length that nearly all the output of the laser diode is coupled into the beam. This means more power, but also uglier spots. Other lenses produce prettier dots because the longer focal length means the edges get chopped off; you lose power, but you get a nice round spot.
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Old 02-27-2013, 08:18 PM #15
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Default Re: Beam Profile with G-2 for 405nm Request

Thank you for that explanation bionic-badger. That is very helpful in understanding the big "why" question.

+repskys
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