Download AKTU B-Tech 3rd Sem 2015-2016 EOE 033NOE Laser System And Applications Question Paper

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99

EOE033/NOE033

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(Following Paper ID and Roll No. to be filled in your Answer Book)

Paper ID 199363100353

Roll No.

B.TECH

(SEM. III) THEORY EXAMINATION, 2015-16

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LASER SYSTEM AND APPLICATIONS

[Time: 3 hours]

[MaximumMarks: 100]

Note: The Question Paper contain three Sections.

Section-A

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Q.1 Attempt all parts of the following. All parts carry equal marks. Write answer of each part in short. (2×10=20)

1. What are modified and unmodified radiations?
2. Explain normalized wave function.
3. What do you mean by active medium?
4. Discuss the process of stimulated emission of radiation.

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5. What do you understand by quality(Q) factor in laser?
6. Describe, how the process of 'hole burning' takes place in the laser gain curve.
7. Mention the fields in which excimer lasers can be used.
8. How is pumping done in solid state lasers?
9. Deduce an expression for de-Broglie wavelength of an electron.

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10. What are the applications of LIDAR?

Section-B

Note: Attempt any five questions from this section of the following: (10×5=50)

2. What are the failure of classical physics? Explain Planck's quantum theory.
3. Discuss the working of resonators in laser system. Classify resonators and explain working of one of them in detail.

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4. What is pumping and discuss its various methods. Find the intensity of a laser beam of 100mW power and having a diameter of 1.3mm. Assume the intensity to be uniform.
5. Derive the laser rate equation in three-level laser system.
6. What do you mean by short pulse generation? Explain any one method to produce it in detail.
7. Describe the construction and working of He-Ne laser.
8. Explain the principle of holography and discuss its applications.

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9. Write short notes on-
   1. Laser applications in ophthalmology.
   2. Laser in diagnostics

Section-C

Note: Attempt any two questions from this section. (15×2=30)

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10. 1. Derive time independent Schroedinger's wave equation for a free particle.
    2. Describe the applications of laser in optical communication.
    3. Explain the construction and working of Ruby laser.
11. 1. What is de-Broglie hypothesis? Derive an expression for de-Broglie wavelength of an electron.

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    2. Describe the principle of laser action?
    3. The ratio of population of the energy levels is 1.059×10-30. Find the wavelength of light emitted at 300K.
12. 1. Explain the functioning and characteristics of excimer lasers with appropriate diagram.
    2. Discuss the applications of laser in material processing.

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    3. What are the processes of spontaneous and stimulated emission of radiation?

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