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Thread: RGB Spatial Filter

  1. #1
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    Default RGB Spatial Filter

    In an effort to save space while using Planter's ingenious telescope+spatial filter, I have theorized a solution that only requires 1 telescope & spatial filter for all colors. Please correct me if my idea is flawed:
    Attached Files Attached Files

  2. #2
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    Default

    Please also forgive me for not knowing how to turn the file into a JPEG.

  3. #3
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    Quote Originally Posted by Stiffler View Post
    In an effort to save space while using Planter's ingenious telescope+spatial filter, I have theorized a solution that only requires 1 telescope & spatial filter for all colors. Please correct me if my idea is flawed:
    Off axis parabolas would work better. They would be aligned so as to have the laser on the optical axis. The design doesn't allow for the beam diameters/divergences of the individual colors to be adjusted...
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  4. #4
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    Hi Laserist,

    In my diagram I used concave mirrors because normal telescopes use spherical as opposed to parabolic lenses. Are you suggesting parabolic mirrors because I am hitting them off axis, or should normal telescopes be using parabolic lenses instead of spherical? My diagram also makes the assumption that all other beam correction has been done before the dichros, and is just being used to clean up the junk common with multi mode LDs.

    Cheers,

    Eric

  5. #5
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    Newtonian telescopes use parabolic mirrors.
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  6. #6
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    Default

    I know nothing about spatial filters, but here is your pic as a JPEG, in Word, just right click and select 'Save as picture'...

    Click image for larger version. 

Name:	RGB SPATIAL FILTER.pdf 
Views:	95 
Size:	82.3 KB 
ID:	42520

  7. #7
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    Quote Originally Posted by Insanity View Post
    I know nothing about spatial filters

    ......................
    “Be who you are and say what you feel, because those who mind don't matter, and those who matter don't mind.” ― Bernard M. Baruch

    "They that can give up essential liberty to obtain a little safety deserve neither liberty nor safety."
    ― Benjamin Franklin; stairwell plaque in the Statue of Liberty

    "And so shines a good deed in a weary world." - Willy Wonka

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  8. #8
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    Quote Originally Posted by TechJunkie View Post

    ......................
    All hail the Godfather of spatial filters!!!!

  9. #9
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    No doubt brother.

    I'll hopefully be meeting the man this spring at the NELEM.

    I liek your idea. I hope you can work it out.
    “Be who you are and say what you feel, because those who mind don't matter, and those who matter don't mind.” ― Bernard M. Baruch

    "They that can give up essential liberty to obtain a little safety deserve neither liberty nor safety."
    ― Benjamin Franklin; stairwell plaque in the Statue of Liberty

    "And so shines a good deed in a weary world." - Willy Wonka

    6 Steps To Prevent You From Getting SCAMMED On The Internet CLICK

  10. #10
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    Has a date been set for NELEM yet? I haven't seen any mention in the forum lately.

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