How to make light beam to be super narrow?

Question

I am doing a project to use a regular laser beam to be super narrow (25um diameter). I am thinking to use some lens setup to do that. Does any lens setup can make a 5mm diameter laser light source to go down to 25um diameter (1/200 of the original)?

Manu de Hanoi · Answer

yes there are ,for example have a look at the open source light sheet micoscopy project
Its usually a combination of beam expander, beam collimation, converging lens.
As others noted, the smaller the focus waist, the faster it increases when out of focus

How to make light beam to be super narrow?

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