Lasers: Important part-B questions

ANNA UNIVERSITY 'PART‒B' QUESTIONS

1. Classify different types of lasers based on active medium, with one example for each.

2. (i) Distinguish between spontaneous emission and stimulated emission of radiation.

(ii) What are Einstein's A and B coefficients?

3. For atomic transitions, derive Einstein relations and hence deduce the expressions for the ratio of spontaneous emission rate to the stimulated emission rate.

4. What is stimulated emission? Explain the existence of stimulated emission using Einstein's theory.

5. What are different pumping mechanisms used in lasers? Give an example for each.

6. Explain the modes of vibrations of CO₂ molecule. Describe the construction and working of CO₂ laser with necessary diagrams.

7. Explain the construction and working of Nd‒YAG laser with neat diagram.

8. Explain the construction and working of CO₂ laser, using energy level diagram.

9. (i) Explain the lasing schemes and working of a Nd:YAG laser.

(ii) Explain the construction and working of a CO₂ Laser.

10. Describe with theory the construction and working of CO₂ laser.

11. (a) What is molecular gas laser? With neat sketch, explain the construction and working of CO₂ laser using energy level diagram.

(b) List out the applications of laser beam in industries and in medical field.

12. What is stimulated emission? Explain the existence of stimulated emission using Einstein's theory.

13. (i). Explain what do you mean by laser emission? What are the conditions to achieve it.

(ii) What is the principle of laser action.

14. Describe the design and working of CO₂ laser with energy level diagram.

15. Derive Einstein Co‒efficients for spontaneous and stimulated Emission.

16. What are the processes that happen when light interacts with matter? Derive the Einstein's relations for a two energy level system.

17. Explain the modes of vibration of CO₂ molecule. Describe the construction and working of CO₂ laser with necessary diagrams.

18. Explain the construction and working of CO₂ laser.

ADDITIONAL PART‒B QUESTIONS

1. Derive Einstein's relation for stimulated emission and hence explain the existence of stimulated emission.

2. For atomic transitions, derive Einstein relations and hence deduce the expressions for the ratio of spontaneous emission rate to the stimulated emision rate.

3. Discuss the various methods employed to achieve population inversion.

4. Explain the construction and working of Nd:YAG laser with a neat diagram.

5. With theory explain the working of Nd‒YAG laser. List out five important applications of this laser.

6. Describe the lasing action in a solid state laser and gas lasers.

7. Explain what is meant by molecular laser. Discuss the construction and working of CO₂ laser.

8. Compare, Nd‒YAG and CO₂ lasers.

9. Describe the construction functioning and applications of CO₂ Laser.

10. Compare CO₂ and Dye Laser.

11. Describe the principle, construction, working and applications of a Dye Laser.

12. a)With a next diagram explain the construction & working of a Rhodamine 6G Dye Laser.

b) List out the merits and demerits of Xanthene dye laser.

13. Compare Rhodamine 6G Dye Laser with Nd‒YAG laser.

14. Discuss the applications of laser in welding, drilling and cutting.