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2003 Course Laser Applications in Instrumentation (Elective I)

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Total No. of Questions : 12] P1006 [Total No. of Pages : 3 [3664]-248 B.E. (Instrumentation & Control) LASER APPLICATIONS IN INSTRUMENTATION (Elective - I) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section-II. 2) Answers to the two sections should be written in separate books. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) What are the various processes due to which the small gain coefficients of laser get affected? Explain in detail. [8] b) Explain in detail how the axial modes and transverse modes of Laser output are formed. [8] OR Q2) a) Explain in detail the process of emission and absorption of radiation.[8] b) Calculate the value of population inversion required to give a gain coefficient of 1 per meter in a Nd:YAG laser with 1.06 micrometer for which the spontaneous life time is 230 microseconds, refractive index of 1.82 and line width of 3 THz. [8] Q3) a) Estimate the threshold current density of a GaAs junction laser of 0.84 micrometer wavelength, 14.5 THz line width, loss coefficient 3500 per meter, refractive index 3.6, dimensions length = 300 micrometer, thickness = 2 micrometer and internal quantum efficiency = 1. [9] 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 0.4 mm. The loss coefficient is 900 per meter length and the internal quantum efficiency is 0.75. [4] c) What are the steps that should be followed in a safe laser laboratory operation? [5] P.T.O.

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