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Old 01-02-2009, 03:12 AM #1
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Default Roithner Lens 27 small fl Lens

Last days of cristmas holidas i remember all the stuff i order the nights online. :
Time ago i buy a Lens 27 from Roithner laser in austria.

Cost about 30 netto, theoretical.
Plus shipping, taxes and so on, its expesive to order one!
http://www.roithner-laser.com/Optics-LD.htm
http://www.roithner-laser.com/All_Da...es/LENS-27.pdf
http://www.roithner-laser.at/All_Dat...t-c-081205.pdf
Online shopping is just via email possible. :-?


LENS-27, M 9 x 0.5, f = 3.6 mm, 1-glass lens collimator, ARC, N.A. = 0.45

Absolute not to compare with the sled small fl lenses.
The beam is clean and no scatter and rings in the beamspot.
Now i found some time to test, and its really good.
[img]www.tshocker.de/Meinebilder/lpf/lens27/closeup.jpg[/img]


I test it with my Bluyray host toghether with Flexdrive powerd by 3x aaa nicd full at 1,35 volt.
Power test i have done 3 times back to back in turn.
The powers written are the approximately average of the measurements.
Both beams are focused to infinity. Also good pic to compare the beam diameter.
[img]www.tshocker.de/Meinebilder/lpf/lens27/metercomp.jpg[/img]



I try to change nothing while i change the lenses to get identical pictures.
To get god pictures from bluray i have to try hardly its difficult with Canon Digital Camera to get these special waveleght... :question In the end it looks to bluish. But the beam diameter is good visible.
This looks like it looks in rl. I save a guess about the beam diameter in mm, just check the picture.

The beamshots are taken with smoke and two tripods.
One for the laser and one for the Camera.
Laser are in same pol alignment to compare the beam thickness.
[img]www.tshocker.de/Meinebilder/lpf/lens27/directcomp.jpg[/img]

[img]www.tshocker.de/Meinebilder/lpf/lens27/front.jpg[/img]

It fit good with aixis module it wobbles like standart lensnut, screw-in depth fits also. I think its a steel lensnut.
I think its close to the otimum we can estimate from a affordable lens.

If i find some time i test for the red.


Daniel


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Old 01-02-2009, 03:27 AM #2
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Default Re: Roithner Lens 27 small fl Lens

Wait,are you selling some of the roithner lens?

Cuz I'm interested

Edit: nvm I looked at the data sheet,that is a lot of money ! (around$30)
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Old 01-02-2009, 03:38 AM #3
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Default Re: Roithner Lens 27 small fl Lens

No, i sell nothing and have no relationship to any laser company.
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Old 01-02-2009, 09:26 AM #4
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Default Re: Roithner Lens 27 small fl Lens

INTERESTING. [smiley=tekst-toppie.gif]

Well done!
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Old 01-02-2009, 12:44 PM #5
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Default Re: Roithner Lens 27 small fl Lens

Wow, nice results.

The beam diameter really looks much better as opposed to the acrylic. The power increase is also quite nice 125->139mw 11.2% increase is definitely not too bad. Too bad they are expensive, but I might give it a try since Austria is a neighbor, maybe the shipping charges should go down as well, but there is still VAT :-/.
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Old 01-02-2009, 03:49 PM #6
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Default Re: Roithner Lens 27 small fl Lens

Quote:
Originally Posted by brtaman
Wow, nice results.

The beam diameter really looks much better as opposed to the acrylic. The power increase is also quite nice 125->139mw 11.2% increase is definitely not too bad. Too bad they are expensive, but I might give it a try since Austria is a neighbor, maybe the shipping charges should go down as well, but there is still VAT *:-/.

Once IgorT gets the new lens GB going, we will all have the opportunity to have this increase in output along with a nice beam

Peace,
dave
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Old 01-02-2009, 03:54 PM #7
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Default Re: Roithner Lens 27 small fl Lens

Quote:
Originally Posted by daguin
[quote author=brtaman link=1230869534/0#4 date=1230903862]Wow, nice results.

The beam diameter really looks much better as opposed to the acrylic. The power increase is also quite nice 125->139mw 11.2% increase is definitely not too bad. Too bad they are expensive, but I might give it a try since Austria is a neighbor, maybe the shipping charges should go down as well, but there is still VAT :-/.

Once IgorT gets the new lens GB going, we will all have the opportunity to have this increase in output along with a nice beam

Peace,
dave[/quote]

When it comes to lasers the more stuff you have to play around/experiment with, the funner the hobby is . But this lens is quite a bit on the expensive side though. :-/

EDIT: Quick someone use me as a timer!
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Old 01-02-2009, 04:07 PM #8
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Default Re: Roithner Lens 27 small fl Lens

Have a cookie.


It's also the eye's peak wavelength.
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Old 01-02-2009, 04:52 PM #9
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Default Re: Roithner Lens 27 small fl Lens

Iam to impatiently, cant really wait for Igor.

and i bought only this one, i still need some small fl from Igor. :


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Old 01-03-2009, 03:42 AM #10
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Default Re: Roithner Lens 27 small fl Lens

Daniel;

Good job.

The more lenses we test, the more data we have to optimize the selection process.

In the photos, it looks like the lens nut is farther out away from the LD.

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Old 01-03-2009, 04:58 PM #11
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Default Re: Roithner Lens 27 small fl Lens

This would be GREAT for use in a scanner, with a red or a BR . It would make the scanned patterns much better due to having a thinner beam.

I might need to get one of these for my BR , or one of IgorTs 8-)
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Old 01-04-2009, 04:02 AM #12
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Default Re: Roithner Lens 27 small fl Lens

@larry
this lens is direkt at the end of the module.
Aixis lens is in the front end of the lens nut.

But you are right it looks strange but the lens is closer to the diode then normal.

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Old 01-04-2009, 05:32 AM #13
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Default Re: Roithner Lens 27 small fl Lens

Very interesting...
I will order one right now
What wavelength is it designed for? I'm on my iPod and the datasheet takes too long to load...
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Old 01-04-2009, 10:10 AM #14
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Default Re: Roithner Lens 27 small fl Lens

Quote:
Originally Posted by Spyderz20x6
Very interesting...
I will order one right now
What wavelength is it designed for? I'm on my iPod and the datasheet takes too long to load...
The specs at roithners web page say its designed for 633nm
Has anybody an idea if this is meant for the focal lenght or the coating? I mean it could be that the focal length is given at this wavelength but the coating is still broadband. Somebody knows?
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Old 01-04-2009, 07:07 PM #15
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Default Re: Roithner Lens 27 small fl Lens

The roithner page say 633 +-30.

I dont know what exactly that mean i think its coated for effiency.
At different wavelength thw focal point differ like i understand.

To check i just have made a test with my very stable open can red with fresh loaded batteries.
To even out possibly variations i change lens after each test and do it the order i write down below.
4 rounds of testing.

1 aixis * * *257mw
2 lens 27 *305mw
3 aixis * * *260mw
4 lens 27 *301mw
5 aixis * * *257mw
6 lens 27 *301mw
7 aixis * * *257mw
8 lens 27 *302mw


lens27 *302,25mw average
aixis * *257,75 average

its 17 percent better than aixis @650nm.
somebody has calculated 11 percent for 405nm.
That means efficiency is still better as for the 405nm.

good lens at all.



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Old 01-04-2009, 08:23 PM #16
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Default Re: Roithner Lens 27 small fl Lens

Because this is closer to the apature of the laser diode, more light will make it into the lens. That means you get more power. You cannot get a smaller beam with the same divergence and power from the same source, it just goes against physics.
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