Tuesday, March 06, 2018

Digi Notes Basic Science LASER complete Material PDF Download

Source [Internet]: http://www.diginotes.in/index.html
www.matterhere.com - Nareddula Rajeev Reddy (NRR)

Topics covered:

  • LASER
  • Characteristics of Laser beam
  • Principle and Production of Laser
  • Induced Absorption
  • Spontaneous Emission
  • Stimulated Emission
  • Einstein’s Coefficients
  • 1. Induced Absorption
  • 2. Spontaneous Emission
  • 3. Stimulated Emission
  • Energy states of atoms
  • REQUISITES OF A LASER SYSTEM:
  • Construction
  • Working
  • VIBRATIONAL ENERGY LEVELS OF A CO2 MOLECULE:
  • SEMICONDUCTOR LASER ( GALLIUM ARSENIDE LASER)
  • APPLICATIONS OF LASERS
  • MEASUREMENT OF POLLUTANTS IN THE ATMOSPHERE
  • HOLOGRAPHY
  • OPTICAL FIBERS
  • CONSTRUCTION OF OPTICAL FIBER
  • TIR (TOTAL INTERNAL REFLECTION)
  • PROPAGATION MECHANISM
  • RAY PROPAGATION IN THE FIBER. ANGLE OF ACCEPTANCE AND
  • NUMERICAL APERTURE.
  • FRACTIONAL INDEX CHANGE (∆)
  • RELATION BETWEEN N.A. AND ∆ 
  • MODES OF PROPAGATION
  • ATTENUATION (POWER LOSS OR FIBER LOSS)
  • EXPRESSION FOR ATTENUATION CO-EFFICIENT (α)
  • DISCUSS THE POINT TO POINT COMMUNICATION SYSTEM USING OPTICAL FIBERS

QUESTION BANK

    1. Obtain an expression for energy density of radiation under equilibrium condition in terms of Einstein co-efficients.
    2. Describe briefly the application of laser in welding, cutting and Drilling
    3. Describe the recording and reconstruction process in HOLOGRAPHY with the help of suitable diagrams.
    4. Describe the construction and working of semiconductor laser.
    5. Describe the construction and working of carbon dioxide laser .with the help of energy level diagram.
    6. What is numerical aperture? Obtain an expression for numerical aperture in terms of refractive indices of core and cladding, and then arrive at the condition for propagation
    7. Discuss the point to point communication system using optical fibers with the help of a block diagram.
    8. Explain the types of optical fibers.
    9. Write a note on measurement of pollutants in atmosphere using laser.


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