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The following graph represents the output for which type of LASER?

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The following graph represents the output for which type of LASER?

(a) He-Ne Laser

(b) Ruby Laser

(c) ND: YAG laser

(d) Semiconductor Diode laser

This question was addressed to me in unit test.

Question is taken from Ruby Laser in chapter Laser of Engineering Physics II

1 Answer

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Right option is (b) Ruby Laser

Explanation: Let there be three energy levels E1, E2 and E3 with E3 > E2 > E1.

Now, when population inversion is achieved between E1 and E2, simulates emission starts and coherent laser light is produced with a sharp peak at 6943 A. It depopulates the level E2 at faster rate than pump rate, stopping laser action momentarily. Before the output falls to zero, the process starts repeating. Due to this, the output consists a series of spikes.

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