Question

The difference between He-Ne Laser is __________

(a) It gives pulsed output

(b) It gives a non-continuous laser beam

(c) It gives a continuous laser beam

(d) No difference

The question was posed to me in examination.

This interesting question is from Helium Neon Laser topic in chapter Laser of Engineering Physics II

Answer 1

Right option is (c) It gives a continuous laser beam

For explanation I would say: As we know, the ruby laser beam is discontinuous and pulsed. However, the He-Ne laser beam is a continuous laser beam. Also, it is a four-level laser while ruby laser is a three-level laser.