(a) Distinguish between single mode and multimode optical fibres. Def…
Previous year question for Applied Engineering Physics.
Question
(a) Distinguish between single mode and multimode optical fibres. Define and find expression for Numerical aperture of step index optical fibre.
(b) Discuss construction and working of He-Ne laser. Why He is mixed with neon in He-Ne laser? Why optical pumping can not be used in gas lasers?
- Year: 2014
- Subject: Applied Engineering Physics