Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: 445nm power diode beam corrector

  1. #1
    Join Date
    Feb 2008
    Location
    Northern Indiana
    Posts
    911

    Default 445nm power diode beam corrector

    I have for sale my take on correcting the beam profile of the new 445nm diodes.

    Sorry, eBay is the only good way of selling I currently have.



    http://cgi.ebay.com/ws/eBayISAPI.dll...m=130424784949

    Click image for larger version. 

Name:	IMG_1780A.jpg 
Views:	84 
Size:	241.9 KB 
ID:	19043

  2. #2
    Join Date
    Dec 2006
    Location
    Netherlands
    Posts
    964

    Default

    is it a cylindrical mirror?

  3. #3
    Join Date
    Feb 2008
    Location
    Northern Indiana
    Posts
    911

    Default

    Quote Originally Posted by Zoof View Post
    is it a cylindrical mirror?
    The mirror starts out flat. What can't be seen in the pictures are adjustment screws on the back of the mount. These screws allow the aluminum face to bend. This bends the mirror allowing for adjustable focus. One can easily achieve .5-.6 mRad. Someone should really try one out. Its pretty amazing once you start turning the adjustment screws and watch your beam just shrink.

    This optic is really a necessity IMO if you are trying to knife edge lots of beams together. The best way I've found to combine more than two 445nm diodes and fit them on a set of 3mm mirrors is as follows. Knife the beams as close to the diodes as possible. Send them through a set of prisms to reduce the exit beam diameter. Then bounce them off my deformable optic to correct the divergence.

  4. #4
    Join Date
    Jul 2009
    Location
    The Netherlands
    Posts
    1,458

    Default

    Hi Logsquared,

    Sounds very interesting.
    My case is only 40cm wide (around 16 inch) would this also work if i place this optic at 30 cm distance ? And how much divergence can then be expected ?
    I didn't fail !
    I just found out 10,000 ways that didn't work.

  5. #5
    Join Date
    Dec 2008
    Location
    veenwouden
    Posts
    2,542

    Default

    finally someone who grabs it

  6. #6
    Join Date
    Feb 2008
    Location
    Northern Indiana
    Posts
    911

    Default

    Quote Originally Posted by hobbybob View Post
    Hi Logsquared,

    Sounds very interesting.
    My case is only 40cm wide (around 16 inch) would this also work if i place this optic at 30 cm distance ? And how much divergence can then be expected ?

    At 30cm the exit beam is approx. 2.4mm and the spot is 19mm at 48 feet = ~.9mRad. This is a conservative measurement. The spot has a definite "hot spot" with some light around it due to the artifacts of the sg-2 lens. I measured the whole spot at 19mm. The area with almost all the power is ~ 12.5 mm.

    The further the distance from the lens the better the quality and size of the spot. It is possible to use a folding mirror inside your projector to double the distance. I have a projector that has a 8 X 24 inch optical deck. With the use of a folding mirror i had no problem getting 1.8W 445 1.5W 532 and 2.4W 658.
    Last edited by logsquared; 08-27-2010 at 07:49. Reason: forgot something

  7. #7
    Join Date
    Jul 2009
    Location
    The Netherlands
    Posts
    1,458

    Default

    ok, i bought one, let's give this baby a try !

    Thanks Logsquared, looking forward to using this nifty device.
    I didn't fail !
    I just found out 10,000 ways that didn't work.

  8. #8
    Join Date
    Feb 2008
    Location
    Northern Indiana
    Posts
    911

    Default

    Quote Originally Posted by hobbybob View Post
    ok, i bought one, let's give this baby a try !

    Thanks Logsquared, looking forward to using this nifty device.

    Thanks! I will put it in the mail on Monday. Please post your results when after you get a chance to "play" with it.

  9. #9
    Join Date
    Jul 2009
    Location
    The Netherlands
    Posts
    1,458

    Default

    I will logsquared !
    Looking forward using it!
    I didn't fail !
    I just found out 10,000 ways that didn't work.

  10. #10
    Join Date
    Aug 2010
    Location
    London or Spain depending on the weather
    Posts
    1,381

    Default

    Hey I am very interested in these test results !

    This a brilliant whacky approach but the flexible mirror worries me a little.

    What do you replace it with if it distorts/breaks?

    Forgive my ignorenz but what is an SG-2 lens ?

    Cheers

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •