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Transcript of Lasers
Light beams practically have unlimited information capacity, low transmission losses, non-dissipation of heat and immunity to cross talk and electromagnetic interference.
Thus, it is highly probable that optoelectronics and photonics in the future will replace
microelectronics. DIFFERENT FORMS /
DIFFERENT CHARACTERISTICS ADVANCEMENTS “War of the Worlds,” H.G. Wells scourged Earth with Martian invaders and a laser like death ray which blasted bricks, fired trees and pierced iron as if those were papers. Albert Einstein speculated that under certain conditions, atoms and molecules could absorb light and be stimulated to shed their borrowed energy. Soviet and American physicists independently theorized how this borrowed energy could be multiplied. 1898 1917 1950 1960 Theodore Maiman extorted the first laser from synthetic ruby that burst a crimson light so brilliant “it outshone the sun.” Aleksandr Prokhorov Charles Hard Townes (first page of the notebook wherein Gordon Gould coined the LASER acronym, and described the technologic elements for constructing the device) (WIKI) This tells
that laser is
a special light. L.A.S.E.R. (In the classical view, the energy of an electron orbiting an atomic nucleus is larger for orbits further from the nucleus of an atom. However, quantum mechanical effects force electrons to take on discrete positions in orbitals. Thus, electrons are found in specific energy levels of an atom, two of which are shown below:) (WIKI) Composed of photons – basic unit of light; no mass but behave as a particle. The brilliant light comes from the synchronized collisions of these photons. (collision of two photons) 2a. Wavelength 2b. Output Power 2c. Duration
of Emission 2d. Beam Divergence
and Size 2e. Coherence 2f. Efficiency and
Power Requirement 3b. Medicine 3c. Military 3d. Remote Sensing 3e. Materials Workings 3f. Other Applications 4a. Excimer
Lasers 4c. Semi-conductor Lasers 4b. X-ray
Lasers 4d. Integrated Optoelectronic Circuits 4e. Laser Videodiscs 4f. Laser Fusion anti-satellite devices laser surgery laser printing laser cutting holography GPS The light that bolted from Maiman’s ruby inspired new lasers and their designs. Power quickly diverged like a sunbeam transiting a prism. Stimulated emissions occur when an atom or molecule that is holding excess energy is stimulated to emit that energy as light. Stimulated emissions occur when an atom or molecule that is holding excess energy is stimulated to emit that energy as light. 3a. Information Handling BETTER UNDERSTANDING
OF HOW LASERS ARE USED PHOTONICS Major Photonics Technologies:
1. Optical Fibers
2. Semiconductor optoelectronic devices (light sources and defectors)
3. Optical storage media
4. Cathode ray fibers and liquid crystals
5. High power lasers for materials processing timeline