DIY Beam Expander.

[WizardG]

Can you simply defocus your laser sources or do need a fat but well collimated beam?

Ah, just saw your other post. If you need very accurate power/area numbers then a beam expander is probably your best choice. But if you don't need 3 digit accuracy in that measurement then just defocus your lasers, or stick a single lens in front of them to spread out the photons a bit.

 

[Cyparagon]

I want the power density of between 50 and 100mw/cm2 at the point of exposure.

For what purpose do you need such a precise density? What are you building or implementing here?

 

[thebigfotos]

Re: dioptika beam expander?

Hey, I am in desperate need for one. I have two systems of 25mW power. One at wavelength 640nm and other one of 473 nm. I want to expand the beam by at-least 10 fold with decreasing the power density at the point of exposure. Can you help with that? I can buy the lenses but I will need help with the housing.

 

[Singlemode Laser]

Re: dioptika beam expander?

Put a neutral density filter or a polarizer into the beam path.

Singlemode

Hey, I am in desperate need for one. I have two systems of 25mW power. One at wavelength 640nm and other one of 473 nm. I want to expand the beam by at-least 10 fold with decreasing the power density at the point of exposure. Can you help with that? I can buy the lenses but I will need help with the housing.

 

[RedCowboy]

I found this and it's good reading, I simply must build something big in the way of a BE.

http://assets.newport.com/webDocuments-EN/images/How_to_Build_a_Beam_Expander_5.pdf

 

[thebigfotos]

I just want to split the photons, what kind of lens do you suggest?

 

[thebigfotos]

Re: dioptika beam expander?

Any idea where can I buy the polarizer?

 

[steve001]

Re: dioptika beam expander?

Any idea where can I buy the polarizer?

I always do a web search instead of waiting for anyone to tell me. You'll likely find it quicker.

 

[steve001]

I found this and it's good reading, I simply must build something big in the way of a BE.

http://assets.newport.com/webDocuments-EN/images/How_to_Build_a_Beam_Expander_5.pdf

The expander explanation is easy. The hard part is finding some non complicated way to construct one.

 

[thebigfotos]

I am using the laser beam for plant growth and that specific power density excites the enzyme system in the germinating seeds.