Dr. A.P.J. Abdul Kalam University MSC (Physics) IV SEM Laser Physics [MSP402T] June 2021 Question Paper

Dr. A.P.J. Abdul Kalam University

Master of Science (Physics)

Fourth Semester Main Examination, June-2021

Laser Physics [MSP402T]

Time: 3:00 Hrs Max Marks 85

Note: Attempt all questions. Each question has two parts.

Part A is 10 marks and part B is 7 marks.

Q.1 (a) Discuss various properties of laser beams in detail.

(b) Explain principle of laser and essential requirement to produce laser

action.

OR

(c) What do you mean by Einestein A and B coefficient? Drive relationship

between Einestein A and B cofficient.

(d) Discuss the condition of population inversion in three level leaser system.

Q.2 (a) What is optical resonator? Discuss the vibrational mode of resonator.

(b) Distinguish between spatial and temporal coherence in laser emission.

OR

(c) Explain different types of coherence properties in Laser.

(d) Discuss spatial coberence as related to the size of the source. Obtain

expression for the lateral spatial coberence with and give its significance.

Q.3 (a) Explain the principle, construction and working of CO2 laser.

(b) Write construction and working of He-Ne gas laser using suitable

diagrams.

OR

(c) Describe the construction and working of ruby laser.

(d) Explain construction and working of Nd-YAG laser.

Q.4 (a) Explain reconstruction process of image in holography.

(b) Write down essay on laser applications.

OR

(c) Discuss various uses of laser in material processing.

(d) Explain reconstruction of image.

Q.5 (a) Write short note on Harmonic generation.

(b) What do you mean by phase matching in non-linear optics?

OR

(c) What do you mean by non-linear optics harmonic generation? Explain

the process of third harmonic generation.

(d) Write a short note on Population inversion?

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