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The following graph shows the physical gain for which kind of laser?

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+1 vote
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in Engineering Physics II by (679k points)
The following graph shows the physical gain for which kind of laser?

(a) CO2 Laser

(b) Semiconductor Laser

(c) Helium Laser

(d) Ruby Laser

I had been asked this question during an internship interview.

My doubt stems from Carbon Dioxide Laser and Semiconductor Laser topic in chapter Laser of Engineering Physics II

1 Answer

+1 vote
by (1.6m points)
Right answer is (b) Semiconductor Laser

The best I can explain: The given figure shows the physical gain for a semiconductor laser. The upper band is the conduction band while the lower one is the valence band. The lasing action is taking place between the two bands.

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