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

What Is the Difference Between Ordinary Light and Laser Light? - Lighting Portal

1000mW Focus Pure Blue Beam Light Laser Pointer Pen with 18650 Rechargeable Battery Silver - Laserpointerpro

Photonics, Free Full-Text

NIF's Guide to How Lasers Work

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

Quantum properties of light

Can sunlight be bounced/focused/ bent or in anyway be made into a laser beam? - Quora

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

How to Focus your laser to make it burn « Science Experiments :: WonderHowTo

Quick guide on laser beam divergence measurement

What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature!