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Old 06-22-2017, 04:51 PM #1
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Default A few questions about unusual lenses ???

I have two lenses that have some unusual properties to them and I'm curious about what these unusual properties do.

The first is a double concave lens but one side is curved more than the other, What does this do ?

And the other is a doublet lens with two lenses glued together, Why ? And the lens surface in the middle is curved more than both of the outside surfaces, What does that do ?



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Old 06-22-2017, 05:09 PM #2
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Default Re: A few questions about unusual lenses ???

Speak with someone at Edmund Optics. Take a look at the site too. Much information you will find. They it will be helpful. I've not seen a bi-concave lens like you describe. I would imagine it spreads light out faster than a lens with equally curved surfaces. The other I've seen and you will find it there.
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Old 06-22-2017, 05:56 PM #3
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Default Re: A few questions about unusual lenses ???

I agree with steve. Look at edumond optics, mellis , or thor they can help you
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Old 06-22-2017, 06:01 PM #4
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Default Re: A few questions about unusual lenses ???

The concave lens will have a negative focal length, used for expanding the light through it, one side more negative than the other, but both adding together for a total amount. The lenses glued together are likely achromatic, helping to keep different visible wavelengths in focus together, otherwise you get noticeable blurring of colors which are extremely noticeable at the edges of objects much like you can see when the light from a prism spreads the wavelengths out, but in very small amounts. On the lens on the right, I believe that is a bi-concave lens, both sides curved in, correct?

I have a lot of questions about optics I need answered myself.
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Old 06-22-2017, 06:39 PM #5
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Default Re: A few questions about unusual lenses ???

Quote:
Originally Posted by Alaskan View Post
The concave lens will have a negative focal length, used for expanding the light through it, one side more negative than the other, but both adding together for a total amount. The lenses glued together are likely achromatic, helping to keep different visible wavelengths in focus together, otherwise you get noticeable blurring of colors which are extremely noticeable at the edges of objects much like you can see when the light from a prism spreads the wavelengths out, but in very small amounts. On the lens on the right, I believe that is a bi-concave lens, both sides curved in, correct?

I have a lot of questions about optics I need answered myself.
Yes both sides are curved in but one side is much more than the other.

The lens on the right being achromatic makes total sense because it came out of a camera lens !
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Old 06-22-2017, 07:04 PM #6
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Default Re: A few questions about unusual lenses ???

Doublets like that will work fine at the output end of a beam expander but can be ruined by a tightly collimated beam. The glue holding the individual lenses together can handle only so much optical power.
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Old 06-22-2017, 07:08 PM #7
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Default Re: A few questions about unusual lenses ???

Gud info: https://www.edmundoptics.com/resourc...ns-geometries/
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Old 06-22-2017, 07:11 PM #8
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Default Re: A few questions about unusual lenses ???

Quote:
Originally Posted by WizardG View Post
Doublets like that will work fine at the output end of a beam expander but can be ruined by a tightly collimated beam. The glue holding the individual lenses together can handle only so much optical power.
Thanks for the warning !

I finally found some info about the bi-concave lenses like mine which is a asymmetrical bi-concave lens "Biconcave asymmetrical lenses are used to minimized spherical aberration".....

And the convex lens has what's call a "meniscus" lens glued to a convex lens....

It's always a good day when you learn something new !
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"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44-81 8+ Watts at 4.5 Amps 450nm Diode In A 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander w/Jetlaser Output Lens Class IV

303 Prome Star Series Green Laser 532nm 80mW DPSS Class IIIb

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Old 06-22-2017, 07:22 PM #9
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Default Re: A few questions about unusual lenses ???

The reason for two pieces of glass glued together, instead of one can be for different reasons, I still expect one reason was to make achromatic.
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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 06-22-2017, 07:24 PM #10
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Default Re: A few questions about unusual lenses ???

Quote:
Originally Posted by Alaskan View Post
The reason for two pieces of glass glued together, instead of one can be for different reasons, I still expect one reason was to make achromatic.
I'm sure your right about that, From what I have read so far that is the main reason they are made.....
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Thor "Saber" Americanised Thor M II - DTR M462 2.2 Watt 462mn Diode W/Super X-Drive @ 1.8 Amps - DTR G-2 lens - LSP 4X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander w/Jetlaser Output Lens Class IV

"Thor's Hammer" Americanised TLY-L201 Host Build W/Old School NASA Type Safety Switch - DTR NUBM44-81 8+ Watts at 4.5 Amps 450nm Diode In A 25mm Copper Module W/Driver - DTR G-2 lens - OPT Laser 6X Cylindrical Lens Pair Fast Axis Correction w/ Custom Made Beam Expander w/Jetlaser Output Lens Class IV

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