How do you focus regular light to make it a laser beam?

How to Build a Beam Expander

Physics - How to Make an Intense Gamma-Ray Beam

Laser - Wikipedia

Focused Laser Beam - an overview

NIF's Guide to How Lasers Work

How to Make a Burning Laser: 9 Steps (with Pictures) - wikiHow

Quantum properties of light

Quantum properties of light

Adaptive optics in laser processing

A Revolution in Optical Manipulation

Laser Speckle: Physics & Perception Science Activity

Laser beam focusing - How to make Best laser focus!