Write short notes on the following:
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 .
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