Laser - Wikipedia
Laser - Light, Amplification, Coherence
Ways to Collimate a Laser Beam - Knowledge - Elite Optoelectronics Co.,Ltd
What Is a Laser? NASA Space Place – NASA Science for Kids
Laser beam focusing - How to make Best laser focus!
Physics - Light Beam with a Curve
NIF's Guide to How Lasers Work
Laser beam focusing - How to make Best laser focus!
NIF's Guide to How Lasers Work
How to focus a normal light into a beam - Quora