Engineering Physics I

Apuntes

Engineering Physics I (SUBJECT CODE: 303192101) Dr. Swagata Roy and Dr. Samrat Sarkar, Assistant Professor ASH, PIET, Parul University LASERS UNIT- 5 LASERS LASER - Light Amplification by Stimulated Emission of Radiation A device that stimulates atoms or molecules to emit light at particular wavelength and amplifies that light producing highly coherent, monochromatic and highly intense narrow beam of radiation 1917 • Albert Einstein lays the foundations for laser. • he predicts the phenomenon of “Stimulated Emission,” which is fundamental to the operation of all lasers History of LASER 1916 • Albert Einstein gave the theoretical prediction of “Stimulated Emission” which is fundamental to the operation of all lasers. 1958 • C.H. Townes and his co-workers constructed first MASER (Microwave Amplification By Stimulated Emission Of Radiation) using ammonia based on the prediction of Einstein. • Townes and Schawlow proposed a method of extending maser principle to visible light. 1960 • T. Maiman built the first LASER (RUBY LASER). • Laser is also called Optical MASER. 1917 • Albert Einstein lays the foundations for laser. • he predicts the phenomenon of “Stimula...