Results 1 to 8 of 8

Thread: Is tight beam possible out of 445nm/450nm MM laser?

  1. #1
    Join Date
    Feb 2014
    Posts
    5

    Default Is tight beam possible out of 445nm/450nm MM laser?

    Hi everyone. This is probably where the highest density of experts gather so I'm open to hear your experience and suggestions.

    From these powerful, multimode laser diodes, is it possible to have a ~2mm beam in the near field with a small divergence (2mrad to 5mrad max)? I'm sure it depends on what laser used, etc... but I'm trying to gauge from your expertise what is possible.

    If this has been discussed before please guide me to the thread.

    Thanks for you help on this.

    Walter

  2. #2
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,486

    Default

    ... with double-prisms-beamshaping its much better, than with the collimator optics alone ... but don't expect wonders

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  3. #3
    Join Date
    Feb 2005
    Location
    Switzerland
    Posts
    1,411

    Default

    Hi Walter,

    That should not be a problem, since the usual specs we can expect from such diodes with good optics is around 4-5mm with <1mrad, sometimes up to 0.5mrad.

    So either put a 3:1 telescope / beam expander in front of a standard diode assembly, either use a different kind of collimators to reach the target result. You will get 1.5-2mm with 1.5-3mrad.

    Depends also if you need a perfect square beam, or if a rectangle beam will also fit your needs, but usually cylinder lens correction is working quite great.

    Sebastien

  4. #4
    Join Date
    Feb 2014
    Posts
    5

    Smile

    Viktor and Sebastien, thanks for your advice. This is a great starting place and I'll look in to these optics and see what can be done.

  5. #5
    Join Date
    Feb 2005
    Location
    Switzerland
    Posts
    1,411

    Default

    U're welcome.

    Btw, I had a good experience with OPT Lasers (Poland, not China) for their mounts and optics, you may have a look : https://optlasers.com/cylindrical-lenses/

    You may also ask some of the laser manufacturers out there, like Phritzler (Live-Lasersystems) or Edison (Brightlight lasers), they have far more experience into optics and they could even build a custom solution for you :-)

  6. #6
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,957

    Default

    John Laughlin at Technological Artisans can order you a Goldenstar 445 module with integral optics inside the diode can to correct the beam shaping. I have the corrected, circularized, blues inside my 5 watt projector and I know they will come close to your specifications. In my case the beam is is a rounded, symmetrical, square in the near field, and if I were to bother to spatial filter it, it would be beautiful and reasonably circularized.

    It is a beam shaping lens implanted on the diode mount, then the diode is gas filled and re-canned, not something you can do at home.

    Steve
    Last edited by mixedgas; 12-16-2021 at 13:37.
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  7. #7
    Join Date
    Feb 2014
    Posts
    5

    Default

    Quote Originally Posted by sbk View Post
    U're welcome.

    Btw, I had a good experience with OPT Lasers (Poland, not China) for their mounts and optics, you may have a look : https://optlasers.com/cylindrical-lenses/

    You may also ask some of the laser manufacturers out there, like Phritzler (Live-Lasersystems) or Edison (Brightlight lasers), they have far more experience into optics and they could even build a custom solution for you :-)
    I've seen the OPTLASER designs and look good. I'll talk with them. I'll also look at the other two. Thanks!

  8. #8
    Join Date
    Feb 2014
    Posts
    5

    Default

    Quote Originally Posted by mixedgas View Post
    John Laughlin at Technological Artisans can order you a Goldenstar 445 module with integral optics inside the diode can to correct the beam shaping. I have the corrected, circularized, blues inside my 5 watt projector and I know they will come close to your specifications. In my case the beam is is a rounded, symmetrical, square in the near field, and if I were to bother to spatial filter it, it would be beautiful and reasonably circularized.

    It is a beam shaping lens implanted on the diode mount, then the diode is gas filled and re-canned, not something you can do at home.

    Steve
    Steve, this is quite interesting. I'll reach out to John. I'm willing to test a few things to get a good beam, hopefully at high efficiency.

    Thanks!

Posting Permissions

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