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Lasers - Coggle Diagram
Lasers
Properties of a laser
Coherent
Spatial coherence
Temporal coherence
Monochromatic
High intensity
Tuneability
High power
Difference between spontaneous and stimulated emission
Stimulated requires external help while spontaneous occurs on its own
While spontaneous emission is polychromatic, stimulated emission is monochromatic
Spontaneous emission was proposed by bohr, stimulated emission was proposed by einstein
Mechanisms of laser
Stimulated emission
Stimulated absorption
Spontaneous emission
Population inversion
A state where the atoms at higher energy are more than that of lower energy levels
Pumping process
The process of using external mediums to excite atoms at lower energy levels to jump to higher energy level
Metastable state
A state at which the atoms excited life time is more
Construction of a laser