31:26

Modes of LASER cavity and standing waves

27:38

Interaction of Light with matter

34:36

3-level System and 4-level system

32:43

Continuous and Pulsed Lasers

29:50

Solid state LASERs

31:36

Calculation of Einsteins coefficient

22:19

Einsteins Concept of stimulated emission

33:24

Mode Locking