Source [Internet]: http://www.diginotes.in/index.html
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
- Obtain an expression for energy density of radiation under equilibrium condition in terms of Einstein co-efficients.
- Describe briefly the application of laser in welding, cutting and Drilling
- Describe the recording and reconstruction process in HOLOGRAPHY with the help of suitable diagrams.
- Describe the construction and working of semiconductor laser.
- Describe the construction and working of carbon dioxide laser .with the help of energy level diagram.
- 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
- Discuss the point to point communication system using optical fibers with the help of a block diagram.
- Explain the types of optical fibers.
- Write a note on measurement of pollutants in atmosphere using laser.
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