Page 2 of 5 FirstFirst 12345 LastLast
Results 11 to 20 of 41

Thread: Mixer

  1. #11
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    Thanks you-all for the thoughts. I wish there were a way to do this..
    I may still try some experimenting..

  2. #12
    Join Date
    Jan 2007
    Location
    Cupertino, California
    Posts
    2,130

    Default

    The reason you see the individual beams is because there are particles in the air. When there is dense smoke, the particles are everywhere and the beam looks solid. If you used a dichro that passed yellow, you would get nothing through because you still only have 532 and 660.
    CLICKY!!!

    Admin: In the immortal words of Captain Planet: YOU HAVE THE POWER
    Admin: (To quit being a bitch)

  3. #13
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    Yes, but I want to mix the two.. together ..to make a singular wavelength .. a 50% loss would be acceptible ..
    I dont know how yet, but, as I've read: if you bounce them together around enough a combining will occur. I dont have a PhD in quantum particlewave optical mechanics but my gut says that this can somehow be done..
    maybe through a separate longitudanally pumped resonator cavity..
    Last edited by steve-o; 09-28-2007 at 16:34.

  4. #14
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    You might not have to mix in a fibre though, one thing single mode fibres can do is get the ends so close together that they look like a single source. That can let you mix beams of arbitrary wavelength and number (up to a point). A cluster of seven fibre ends is one way to get a powerful red laser. Not an easy one though.
    Do you have a diagram or a link Doc?

  5. #15
    Join Date
    Jun 2005
    Location
    SoCal
    Posts
    508

    Default

    If you're willing to accept some power losses, run it through a pinhole...
    surplus spatial filters work great... The power loss would be less than
    that of fiber...

  6. #16
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    Yadda! Your back! Missed Ya' ! Can you elaborate a little?
    Appreciate it!!!

  7. #17
    Join Date
    Jan 2007
    Location
    Yorkshire, UK
    Posts
    4,585

    Default

    If it's any help i'm experimenting with using single mode fibers for holography. So far i've managed to get 88% efficiency through a 6uM single mode fiber. This is using a 50x microscope objective on a homebrew launcher. The beam emerges from the fiber beautiful and clean, but you would need something to re-collimate the beam as it's very divergent. I suspect that if I had (or could afford) a professional fiber launcher I would be able to acheive >90% efficiency.

    I have a couple of lasers for holography, a 632.8Nm HeNe and a 532Nm Coherent C315m. Maybe I could try combining them and let you know what happens, as long as you're not in a hurry as time is short at the moment.

    Cheers

    Jem
    Last edited by Jem; 10-03-2007 at 02:17. Reason: I gave wrong objective mag

  8. #18
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Lightbulb

    In my projector the combined green and red beams look pretty much yellow IMO... I'll take a pic when I get home, but I think it looks a lot like what you are going after.
    Last edited by allthatwhichis; 10-03-2007 at 20:34.

  9. #19
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    Maybe I could try combining them and let you know what happens, as long as you're not in a hurry as time is short at the moment.
    Sounds great, and no hurry -its a hobby, not my job

    It that the beam w/o fog or the spot on the wall, Allthat? My spot looks yellow too.. well that didnt come out exactly right...

  10. #20
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Lightbulb

    No, it is the beam. I checked a little last night and it looks mainly yellow, but there are a few red and green speckles. The camera I used has a slow exposure so it looked yellow in the pics I took. I also tried with all three going and my beam looks white if I am aligned perfectly but I still get a little R, G, or B speckle because the beams aren't all the same size... but for the most part the middle is nice and white.

Posting Permissions

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