Written Laser Hair Removal Practice Exam

What does 'collimated' refer to in laser technology?

1. Photons moving in a spiral pattern

2. Photons being absorbed by a medium

3. Photons spread out in an expanding beam

4. Photons are parallel to each other in a beam

The correct answer is: Photons are parallel to each other in a beam

Collimated in laser technology refers to the photons being parallel to each other in a beam. This is the only option that accurately describes the characteristic of collimation. Option A, photons moving in a spiral pattern, would create an unfocused and scattered beam. Option B, photons being absorbed by a medium, would result in dimmer and weaker output. Option C, photons spread out in an expanding beam, would also result in a less focused and weaker beam. Therefore, the only correct choice is option D.