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Applied Physics 2: Laser and Fibre Optics
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Applied Physics 2: Laser and Fibre Optics
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25 Questions

1. How much energy is released per pulse if wavelength is 6600 Å?
2. A fibre optic telephone transmission can handle more than thousands of voice channels.
3. Which of the following is not a characteristic of LASERS?
4. The highest-powered CO2 laser had a power of _________
5. What will be the relative population of atoms in a ruby layer that produces a light beam of wavelength 6943 Å at 300 K.
6. Which of the following has more distortion?
7. The difference between He-Ne Laser is __________
8. Which of the following is known as fibre optic back bone?
9. What is the relationship between B21 and B12?
10. He-Ne laser is a type of ____________
11. What is the wavelength of the emitted laser by a carbon dioxide?
12. After pumping, Which level will the atom jump to?
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13. DVD uses the laser.
14. Which of the following is an example of optical pumping?
15. Which of the following can be used for the generation of laser pulse?
16. In which region of the electromagnetic spectrum, does the semiconductor laser lies?
17. He-Ne laser is used in Holography.
18. Calculate the number of photons, from green light of mercury (ʎ = 4961 Å), required to do one joule of work.
19. What causes microscopic bend?
20. The ratio of N2 and N1 is given by ___________
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21. When more than one mode is propagating, how is it dispersed?
22. During pumping, the atoms are exited to ___________
23. What is the other name for a maximum external incident angle?
24. In Stimulated Absorption, what is the lifetime of atoms ground state?
25. Which of the following Einstein’s coefficient represents spontaneous emission?

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