Engineering Physics
UNIT 2LASER AND OPTIC FIBRE Explain laser with its operation in detail. Write the frequency and wavelength of infrared, ultraviolet and visible light. Explain the difference in energy levels across which an excited electron drops determines the wavelength of the emitted light. Write and explain various components of a laser. Explain different types of laser briefly. Write short note on: Gas laser Free Electron Laser 7. Illustrate Irradiance with diagram.8. State
characteristics of materials.9. Explain Hetro Junction Laser.10. State characteristics of CO2 lasers.11. Draw and explain sealed tube design of laser.12. Draw and explain transverse flow design of CO2 laser.13. What are Fiber Optics?14. Draw the typical structure of a fibre used for communication links.15. Define attenuation and absorption.16. What is dispersion? What are the effects of dispersion on an optical fibers performance.17. Explain MFD and cut-off wavelength.18. Draw and explain single and multimode fiber.19. What is an acceptance angle of an optical fiber?20. Explain Numerical Aperture (NA).21. What is an acceptance cone of an optical fiber?22. Write the relation between NA and Δ.23. Compare step index and graded index fibre.
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