M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
Third Semester
Physics
Elective — MODERN OPTICS AND LASER PHYSICS
(CBCS 2014 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. State the laws of reflection.
2. What is Doppler effect?
3. State the principle of linear superposition.
4. How does the interference of light from the transmittance
light different from the reflected light from a thin film?
5. Is there any relation between holography and acoustics?
Explain your answer.
6. State and explain Huygen's principle.
7. What is self-focussing of light?
8. What do you mean by non-linear response? Explain.
9. What is metastable state?
10. Define spontaneous emission and stimulated emission.
Sub. Code
4MPH3E4
AFF-4875
2
Ws8
Part B x 5 25)
Answer all questions, choosing either or
11. Explain briefly about phase velocity and group
velocity.
Or
What is evanescent waves? Discuss evanescent
waves in total reflection.
12. Give the theory of multilayer film and obtain
the relation for the reflectance and
transmittance
Or
Explain the principle of Fourier transform
spectroscopy.
13. Discuss in detail the Kirchoff formulation of
diffraction by a plane screen.
Or
Describe briefly the extension of holographic
concepts to microwave spectroscopy.
14. Explain briefly about stimulated Raman Scattering.
Or
Derive Manley Rowe relations.
15. What are the different methods of producing a
population inversion? Explain shortly.
Or
Derive rate equations for three level system and
hence prove that the pumping is possible in three
level system.
AFF-4875
3
Ws8
Part C 10 30)
Answer any three questions.
16. What is polarisation? Explain about circular and elliptic
polarisation.
17. Describe Michael son's interferometer and give the theory
of partial coherence.
18. Describe the methods of recording and reconstruction in
embossed and thick hologram.
19. Discuss the theory of laser Raman spectroscopy with neat
diagram.
20. Describe the principle, construction and working of
a Ruby laser.
Mention few applications of laser in medical field.