Answer to Quizs:

Quiz 1:

Laser light is:
both wavelike and particle like

Lasing is possible when:
population inversion exists

To get smaller possible laser focal spot size, one should:
use shorter wavelength laser and longer focus length lens

The Depth of Focus for a laser is:
shorter when the focal spot size is smaller

Correct atatements about laser modes is: The higher the mode, the easier to focus the laser beam to a small point

A laser beam is of wavelength l =0.355*10^-3 mm and diameter D=3 mm, b =1.1, what is its diffraction limited divergence?

answer: 1.1*0.355*10^-3/3 = 0.1302 mrad