Best lens for Collimation ?

[Solomon Laser]

I have a lens that is the same quality as the G2 and G7 but with a 11mm focal length, much much better than the tripple glass lenses sold on ebay. I have found this to be the best. If you don't believe me I can send you one for free, just pay me 5$ for shipping... they sell for 15-25 :wave:

PM me

 

[GSS]

I have a lens that is the same quality as the G2 and G7 but with a 11mm focal length, much much better than the tripple glass lenses sold on ebay. I have found this to be the best. If you don't believe me I can send you one for free, just pay me 5$ for shipping... they sell for 15-25 :wave:

PM me

What does this even mean??
I'll send you one for "FREE" but send me $5 for shipping:crackup:
Last I heard free meant free?? Shipping for a single lens is maby $1.50 tops..
These are the same lens you want to sell for $7 right
Your starting to get on my nerves with all this nickle and dime stuff your trying:tsk:

 

[Encap]

What does this even mean??
I'll send you one for "FREE" but send me $5 for shipping:crackup:
Last I heard free meant free?? Shipping for a single lens is maby $1.50 tops..
These are the same lens you want to sell for $7 right
Your starting to get on my nerves with all this nickle and dime stuff your trying:tsk:

Exactly--anyone can buy 1 piece of a G2 lens on ebay at a retail price of $5.98 with free shipping from laserlands and even less elsewhere see: https://www.ebay.com/i/381139270764?chn=ps&dispItem=1
Not to mention anyone can but 1 piece of 11mm focal 6mm Aspherical Glass Lens for $6.27 with free shipping here: https://www.ebay.com/p/5pcs-Laser-Co...d=201061913596 and 5 pieces for $17.28 that is $3.46 each here:
5pcs Laser Collimating Lens 11mm Focus Dia 6.0mm Aspherical Glass Lens | eBay

:crackup:

 

[Alaskan]

Don't know.
Where do you see bi-cvx aspherics being used? There can't be a pcx asphere. It's either a pcx lens or a bi-cx asphere lens.

Steve, I just now found your post, I have all my email notifications going to trash without seeing them come in. I guess I should just turn notifications off.

Re: your question, I have several plano-convex aspherical lenses, up to 50mm diameter for lasers, they exist.

 

[lazeristasUVISIR]

Don't know.
Where do you see bi-cvx aspherics being used? There can't be a pcx asphere. It's either a pcx lens or a bi-cx asphere lens.

Laser Diodes:
My experience - many collimating lenses are plane/asphere. Only a small portion of asphere / asphere. We use only a multi lens system (all kind of achromats) for very specific applications.

532 nm laser - this laser has a very different laser beam properties (small initial divergence) thus a concave/plane and plane/convex system collimates well enough. The next level would be to use achromats.

LED:
not my specialty, but as I know, the collimating optics is very very complicated. A simple lens is not efficient as it can not collect all light.

 

[steve001]

Steve, I just now found your post, I have all my email notifications going to trash without seeing them come in. I guess I should just turn notifications off.

Re: your question, I have several plano-convex aspherical lenses, up to 50mm diameter for lasers, they exist.

Laser Diodes:
My experience - many collimating lenses are plane/asphere. Only a small portion of asphere / asphere. We use only a multi lens system (all kind of achromats) for very specific applications.

532 nm laser - this laser has a very different laser beam properties (small initial divergence) thus a concave/plane and plane/convex system collimates well enough. The next level would be to use achromats.

Can either of you provide a link to a photograph of such a lens?

If the application is to achieve very low beam divergence why would an achromat lens be useful?

 

[lazeristasUVISIR]

Can either of you provide a link to a photograph of such a lens?

If the application is to achieve very low beam divergence why would an achromat lens be useful?

Plane on one side, asphere on other (plane/asphere) from Thorlabs site
https://www.thorlabs.us/drawings/4c...073-3298-7B73F9A5DF831877/A230-AutoCADPDF.pdf

Convex / asphere
https://www.thorlabs.us/drawings/4c...073-3298-7B73F9A5DF831877/A220-AutoCADPDF.pdf

Asphere / Asphere
https://www.thorlabs.us/drawings/4c...3298-7B73F9A5DF831877/352140-A-AutoCADPDF.pdf


If you look at aspherical lenses, most of them are small and have a limited focal length. If the length increases the price goes up like crazy too. Thus some trade-off with achromats is done in a design.

 

[steve001]

Plane on one side, asphere on other (plane/asphere) from Thorlabs site
https://www.thorlabs.us/drawings/4c...073-3298-7B73F9A5DF831877/A230-AutoCADPDF.pdf

Convex / asphere
https://www.thorlabs.us/drawings/4c...3298-7B73F9A5DF831877/352140-A-AutoCADPDF.pdf


If you look at aspherical lenses, most of them are small and have a limited focal length. If the length increases the price goes up like crazy too. Thus some trade-off with achromats is done in a design.

I see.