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2003 Course Laser Applications In Instrumentation (Elective I)

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Total No. of Questions : 12] P1081 [Total No. of Pages : 3 [3864] - 286 B.E. (Instrumentation & Control) LASER APPLICATIONS IN INSTRUMENTATION (2003 Course) (Elective - I) 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 in detail the process of absorption, spontaneous and stimulated emissions of radiation with the help of energy level diagram. [8] b) Explain the importance of Einstein relations in emissions of radiation.[8] OR Q2) a) Calculate the ratio of rates of spontaneous and stimulated emissions for a tungsten filament lamp operating at temperature of 2000K with average frequency to be 5 1014 Hz. [5] b) Estimate the relative populations of two energy levels such that a transition from the higher to the lower will give visible radiations of 550 nm at room temperature (T = 300K). [5] c) What are the properties of Laser? [6] 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 3.6 and laser cavity length is 0.2 mm. The loss coefficient is 800 per meter length and the internal quantum efficiency is 0.8. [6] P.T.O.

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