RGB Spatial Filter

[Stiffler]

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:

[Stiffler]

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

[laserist]

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...

[Stiffler]

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

[laserist]

Newtonian telescopes use parabolic mirrors.

[Insanity]

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

[TechJunkie]

I know nothing about spatial filters

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[Stiffler]

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All hail the Godfather of spatial filters!!!!

[TechJunkie]

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.

[Stiffler]

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