MPSC Rajyaseva 2014 CSAT — Question 19

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प्रेरित उत्सर्जन प्रक्रियेसाठी त्रिस्तरीय लेझर मध्ये ______ . / For induced emission in a three level laser :

a)50% अणू अंशस्थिर स्थितीत असतात. / 50% of atoms should be in metastable state.

b)50% पेक्षा कमी अणू अंशस्थिर स्थितीत असतात. / < (less than) 50% of atoms should be in metastable state

c)50% पेक्षा जास्त अणू अंशस्थिर स्थितीत असतात. / > (more than) 50% of atoms should be in metastable state&check; Correct

d)अंशस्थिर स्थिती रिक्त असते. / metastable state must be vacant

In a three-level laser system, population inversion requires more than 50% of the atoms to be pumped into the metastable state so that stimulated emission can dominate over absorption.