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2003 Course Laser Applications in Instrumentation (Elective I)

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Total No. of Questions :12] [Total No. of Pages : 3 P1562 [3764]-286 B.E. (Instrumentation & Control) LASER APPLICATIONS IN INSTRUMENTATION (Elective - I) (2003 Course) Time :3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from section I and section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Use of electronic pocket calculator is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Explain the importance of Einstein s equations in emissions of radiation. [8] b) Explain in detail the process of emission and absorption of radiation.[8] OR Q2) a) b) State the different processes due to which the small gain coefficients of laser get affected. [8] Write short notes on : i) Laser modes. ii) [8] Q switching. Q3) a) What is different laser system features which are applicable to most commercial and industrial lasers? Explain each in short. [12] b) Estimate the efficiency of a GaAs laser operating well above threshold. The refractive index of material is 2.6 and laser cavity length is 0.3 mm. The loss coefficient is 900 per metre length and the internal quantum efficiency is 0.8. [6] OR P.T.O.

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