Laser
Download as PPT, PDF4 likes1,104 views
The document discusses the history and principles of lasers. It defines LASER as an acronym for "Light Amplification by Stimulated Emission of Radiation". Albert Einstein first theorized the possibility of lasers in 1917, and the first working laser was created by Theodore Maiman in 1960. The document explains the principles of spontaneous emission, stimulated emission, population inversion, and optical pumping which allow for lasing action. Examples of ruby lasers and applications of lasers in communication, guidance systems, barcodes, holograms, manufacturing and more are provided.
Laser
- 1. By, Xavier Prathap.W I BSc, MPC. 1
- 2. LASER LASER is an acronym for , Light Amplification by Stimulated Emission of Radiation 2
- 3. History of LASER In 1917, Albert Einstein first theorized the possibility of Lasers. The first working laser was created by Theodore Maiman on May 16th, 1960 at the Hughes Research Laboratory in California. 3
- 4. Spontaneous Emission Excited atoms normally drop to Lower Energy Level Spontaneously Photons are uncorrelated and unidentical Incoherent light 4
- 5. Stimulated Emission Excited atoms are forced to emit by another matching photon Photons are correlated and identical Coherent light 5
- 6. Principle of Laser Population Inversion. The phenomenon of exciting the atoms, so that, there are more number of atoms in the Higher Energy Level than in the Lower Energy Level Optical Pumping The method of achieving Population Inversion is known as Pumping. And, one of the types of pumping in known as Optical Pumping. 6
- 7. Lasing Action Diagram Excited State Spontaneous Energy Emission Metastable State Optical Pumping Stimulated Emission of Radiation Ground State 7
- 8. Ruby Laser 8
- 9. Properties of Laser Laser light is highly monochromatic. Laser light is extremely directional. Laser light is spatially coherent. Laser light is extremely intense and bright. 9
- 10. Applications of Lasers Laser are used, In optical communication. In guiding missiles to desired destinations. To scan information on bar codes. To make holograms. In making Integrated Circuits. In CD players In surgery. In industries to cut and weld strong metals. To measure distances very accurately. To store and view 3D informations. 10
- 11. THANK YOU 11