Tuesday, March 4, 2014

A vs O

external source ---> excites atoms to short-lived energy level ---> spontaneous emission to metastable level ----> large population at metastable --->population inversion between metastable and lower laser level ----> stimulated emission (photons spontaneous emitted in the population inversion area) ----> laser.

hulala. quiz for laser this morning. wish me luck!

LASER - Light Amplification by Stimulated Emission of Radiation
LOSER - not that loser okay..but Light Oscillation by Stimulated Emission by Radiation

external source.
popluation inversion.
stimulated emission.
3-level laser
4-level laser

aja aja !

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