Question

Write short notes on the following:

Mode locking                                 [5]

Resonator configuration                             [5]

Laser modes

Answer 1

Mode locking is a technique in optics by which a laser can be made to produce pulses of light in extremely short duration

Resonator configuration - The most commonly used configurations are consisting of two spherical or flat mirrors facing each other . Some of the configurations are confocal , hemispherical

Laser modes - laser mode means the possible standing wave in a laser cavity

modes id calculated by m = 2L/ (c/f)

where L = length of cavity , c = speed of light , f = frequency .