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Old 08-30-2017, 03:50 AM #145
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Default Re: The Cyan Cannon Vll Build

Quote:
Originally Posted by jors View Post
This is why I go with achromatics doublets/triplets positive lenses on my RGB SF, to minimise focal shift because of refractive index. They work pretty good..of course lenses must be high quality.
PCX achromatic?


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Old 08-30-2017, 03:59 AM #146
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Default Re: The Cyan Cannon Vll Build

Definition: An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus in the same plane.

......Interesting
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Old 08-30-2017, 05:43 AM #147
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Default Re: The Cyan Cannon Vll Build

I believe in this case he is talking about compound lenses, similar to camera lenses. As far as I know there is no single lens that will correct for all color aberrations. A spatial filter needs to focus all light, usually one color, to converge at a pinhole. Anything that doesn't is blocked, so when you are using optics of any kind, it introduces aberrations into your system. In holography it is best to have your reference beam clean of any noise introduced by these optics. A spatial filter does that.
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Old 08-31-2017, 12:28 AM #148
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Default Re: The Cyan Cannon Vll Build

OK...Maybe CDBEAM is not an "Optics Nub"....But....I still have much to learn !!

Thinking about it....typically...refraction is accompanied by the prismatic effect...But...the discussion regarding "Achromatic lenses"...new to me....Well...whatever....I am fascinated by Optics theory....but....I am learning all the time ! It's all good...

I am more of a " Hands-on" person....we each have our talents...and the valuable part is to share !!! There are not too many days that pass...that I do not learn something about optics on LPF.

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Old 08-31-2017, 06:06 AM #149
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Default Re: The Cyan Cannon Vll Build

Wish I could find a PCX achromatic aspherical lens, or can they even exist? I could use that as a collimator for an RGB laser.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 08-31-2017, 06:30 AM #150
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Default Re: The Cyan Cannon Vll Build

You know I'm not sure what effect chrome aberration might have on collimation. I know it matters when trying to focus an image or a large field of colors through a tiny pinhole. That is a question I don't have an answer to off the top of my head.
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532nm 189mW pocket lab laser
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632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
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