Q2 (a) Discuss Amplified Spontaneous Emission and how a laser design will minimize it-

(b) Explain the phenomenon of Mode Locking.

(c) Explain how a laser can be Q switched.

Q3. Discuss how any two of the following lasers operate

(a) Excimer Laser (b)Dye Laser (c)Carbon dioxide Laser (d)He-Ne Laser

(e)Nd Yag Laser (f)Ruby Laser (g) Free Electron Laser