Question

Briefly explain the meaning of the following terms: (i) primary photochemical process (ii) quantum yield (iii)...

Briefly explain the meaning of the following terms:

(i) primary photochemical process

(ii) quantum yield

(iii) Stark-Einstein law

(iv) active medium

(v) optical feedback

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Answer #1

Active medium may be solid, liquid, gas or plasma and it is the collection of atoms and molecules which can be excited to population.

Optical feedback is the one which decreases the gain in lasing threshold by increasing the power output at given DC.

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