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Friday, 19 October 2012

Lasers and non-linear optics-model question paper for MSc/PhD

1(a)Explain in detail various characteristics of LASER. (4 Marks)
(b) Derive the relations between various Einstein coefficients. (6 Marks)
(c) Differentiate between three level laser systems and four level laser systems. (6 Marks)
(d) Determine the difference in energies between two energy levels which results in a LASER of wavelength 632.8 nm. (4 Marks)
2(a) Write a note on mode coupling. (4 Marks)
(b) What is optical pumping? Explain. (6 Marks)
(c) Explain different types of resonators used in LASER systems. (6 Marks)
(d) Length of the resonant cavity is 50 cm. Determine the number of modes if the refractive index of the active medium is 1.01. (4 Marks)
3(a)Explain the importance of creation and annihilation operators in a quantum mechanical harmonic oscillator. (8 Marks)
(b) What are Fock states? Explain. (4 Marks)
(c) Explain how the rates of absorption and emission are calculated using the second quantized interaction Hamiltonian. (8 Marks)
4(a)Explain the working ammonia MASER. (6 Marks)
(b)Explain the significance of Zeeman splitting in the construction of Hydrogen MASER. (6 Marks)
(c) Deduce the condition for obtaining population inversion in three level MASER system. (8 Marks)
5(a) Differentiate between spatial coherence and temporal coherence. (6 Marks)
(b) Write a note on kinetics of optical absorption. (8 Marks)
(c) Explain collision broadening in plasma systems. (6 Marks)
6(a)Explain with the help of suitable equations, fluorescence quantum yield of LASER. (6 Marks)
(b) Explain the working of Ruby laser. (7 Marks)
(c) Explain the working of Nd:YAG laser. (7 Marks)
7(a) With the help of energy level diagrams, explain the working of He-Cd LASER and He:Se LASER. (10 Marks)
(b) What are vibronic LASERS? Explain. (6 Marks)
(c) Write a note on Excimer LASERS. (4 Marks)
8 (a) What is phase matching? Explain. (6 Marks)
(b) Write a note on optical mixing and parametric generation of light. (8 Marks)
(c) Explain the phenomenon multiquantum photoelectric effect. (6 Marks)

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