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Old 07-14-2010, 07:04 AM #1
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Default Cylindrical correction optics for 445, 638

The test units from the final manufacturer have arrived and check out good. They are broadband coated < 0.5% reflectivity. The final total losses including bk7 glass are 3%, vs an estimated 10% for prisms. <0.9 mrad emission is achievable with these (after an ashperic collimator) used to expand the slow axis of 445nm diodes and other multimode diodes with similar emitters, incl. the 500mW reds.

GET LENSES HERE


Beam at 56 feet (17 meters)


dimensions: 12hx9wx3t, 8hx3wx2.5t (mm)
Material: BK7
AR Coating Range: 350-700nm
Surface Quality: 60-40 Scratch/Dig
Surface accuracy: λ/2 curved, λ/4 flat


Set-up distance between lenses: 20mm

To take a note from p1t8ull,
Features compared to anamorphic prisms:
Fixed magnification setup
Less Power loss compared with prisms
Same space taken up as prisms
Beam(s) stay centered after correction optics, offset for prisms

"I can confirm that both beam correcting methods are a bit fiddly to set up, but neither should be beyond the capability for most people here if the basics are correct and time and care is taken."

These are the lenses that will be used in the Blue Lava II kit, please only order from here if you are not getting the kit, or want additional lenses. These will be ordered along with the kit lenses.

GET LENSES HERE

Paypal instructions: Calculate the total using the above google checkout page, then add 1% to cover the paypal fee difference. Then PM me for the paypal address.




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Last edited by drlava; 09-24-2010 at 04:48 AM.
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Old 07-14-2010, 07:13 AM #2
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Default Re: Cylindircal correctino optics for 445, 638

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Uh, someone please fix the title here.. :/
Click "edit" then "go advanced" then you can edit the title.
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Old 07-14-2010, 07:18 AM #3
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Default Re: Cylindircal correctino optics for 445, 638

You can edit the title yourself by clicking "Edit" and then "Go Advanced" then changing the subject line.
Thanks for sharing this. It looks great. I am interested...

Edit: @TJ Missed your post. Beat me to it.

Last edited by RA_pierce; 07-14-2010 at 06:47 PM.
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Old 07-14-2010, 07:18 AM #4
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Default Re: Cylindircal correctino optics for 445, 638

Awesome!

Do you have a sketch of how to set them up?

Or better yet, pictures of your set up?
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Old 07-14-2010, 07:22 AM #5
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Default Re: Cylindrical correction optics for 445, 638

thanks guys, fixed the title. Yes, a sketch will be forthcoming. Basically the concave lens is used to spread the slow axis and the convex lens is used to straighten it out.
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Old 07-14-2010, 07:25 AM #6
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Default Re: Cylindrical correction optics for 445, 638

Ok, order incoming...

I've never done this set up, but am looking forward to trying it. Are you using an additional collimation lens? And is it before or after the correction optics?

I guess you will show all of that on the sketch...

P.S. I ordered but the Google check out did not record my LPF user name in the form...
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Old 07-14-2010, 07:32 AM #7
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Default Re: Cylindircal correctino optics for 445, 638

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Originally Posted by RA_pierce View Post
You can edit the title yourself by clicking "Edit" and then "Go Advanced" then changing the subject line.
Didnt I say the same exact thing 5 minutes earlier?

Are you ignoring my posts or something?
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Old 07-14-2010, 02:19 PM #8
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Default Re: Cylindrical correction optics for 445, 638

What is the focal length of the lenses? How much do they expand the beam?
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Old 07-14-2010, 04:10 PM #9
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Default Re: Cylindrical correction optics for 445, 638

Order in

-- waits for the full modules . . . . .

Peace,
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Old 07-14-2010, 04:32 PM #10
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Default Re: Cylindrical correction optics for 445, 638

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What is the focal length of the lenses? How much do they expand the beam?
All the details will be in the documentation with the lenses.
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Old 07-14-2010, 04:59 PM #11
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Default Re: Cylindrical correction optics for 445, 638

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used to expand the slow axis of 445nm diodes and other multimode diodes with similar emitters
Would it not be better to compress the fast axis instead, much like a c-mount with FAC.
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Old 07-14-2010, 05:44 PM #12
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Default Re: Cylindrical correction optics for 445, 638

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Would it not be better to compress the fast axis instead, much like a c-mount with FAC.
No, tiny FAC application on a canned diode isn't practical, and correcting only the fast axis on this diode after the collimator leaves you with a pretty bad beam due to the large slow axis emitter. These lenses take care of the axis that spreads at about 4mrad, and bring the beam into a 3.5x2mm size with good divergence.
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Old 07-14-2010, 06:08 PM #13
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Default Re: Cylindrical correction optics for 445, 638

Dr Lava,

I would be interested in knowing if these optics are designed to be placed after a collimating lens, or before it. Depending on the type of collimating lens used, would that affect the positioning of these optics?

Also, does the incident beam need to be collimated as tightly as possible to begin with?

I need to know since I'll be knife edging two of the diodes together, and would be interested in using only one set of such optics, AFTER the beams have been stacked..

..maybe I'll just wait for a picture..
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Old 07-14-2010, 09:28 PM #14
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Default Re: Cylindrical correction optics for 445, 638

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Dr Lava,

I would be interested in knowing if these optics are designed to be placed after a collimating lens, or before it. Depending on the type of collimating lens used, would that affect the positioning of these optics?

Also, does the incident beam need to be collimated as tightly as possible to begin with?

I need to know since I'll be knife edging two of the diodes together, and would be interested in using only one set of such optics, AFTER the beams have been stacked..

..maybe I'll just wait for a picture..
These go after the collimating lens. So you can knife edge two beams before sending them through this. The incoming beam should be collimated tightly, yes.
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Old 07-14-2010, 09:39 PM #15
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Default Re: Cylindrical correction optics for 445, 638

Some photos of the beam spot would be nice.
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Old 07-14-2010, 10:02 PM #16
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Default Re: Cylindrical correction optics for 445, 638

Quote:
Originally Posted by drlava View Post
These go after the collimating lens. So you can knife edge two beams before sending them through this. The incoming beam should be collimated tightly, yes.
Alright! Sounds great!
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