UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's

Page 1 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=1' data-page='1' class='cut-thumb lazyload' alt='Page 1: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/1.jpg' width='140' height='200' /> FACULTY OF ENGINEERING & TECHNOLOGY

DEPARTMENT OF APPLIED SCIENCE& HUMANITIES

ENGINEERING PHYSICS(TAS-202)

UNIT II

Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's

coefficients, Relative contribution of stimulated and spontaneous emissions, Population

inversion, Laser emission, Ruby and He-Ne lasers.

Dr.Alka Mishra

Assistant Professor

Page 2 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=2' data-page='2' class='cut-thumb lazyload' alt='Page 2: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/2.jpg' width='140' height='200' /> Page 3 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=3' data-page='3' class='cut-thumb lazyload' alt='Page 3: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/3.jpg' width='140' height='200' /> Page 4 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=4' data-page='4' class='cut-thumb lazyload' alt='Page 4: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/4.jpg' width='140' height='200' /> Page 5 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=5' data-page='5' class='cut-thumb lazyload' alt='Page 5: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/5.jpg' width='140' height='200' /> Page 6 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=6' data-page='6' class='cut-thumb lazyload' alt='Page 6: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/6.jpg' width='140' height='200' /> Page 7 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=7' data-page='7' class='cut-thumb lazyload' alt='Page 7: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/7.jpg' width='140' height='200' /> Page 8 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=8' data-page='8' class='cut-thumb lazyload' alt='Page 8: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/8.jpg' width='140' height='200' /> Page 9 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=9' data-page='9' class='cut-thumb lazyload' alt='Page 9: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/9.jpg' width='140' height='200' /> Page 10 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=10' data-page='10' class='cut-thumb lazyload' alt='Page 10: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/10.jpg' width='140' height='200' /> Page 11 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=11' data-page='11' class='cut-thumb lazyload' alt='Page 11: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/11.jpg' width='140' height='200' /> Page 12 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=12' data-page='12' class='cut-thumb lazyload' alt='Page 12: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/12.jpg' width='140' height='200' /> Page 13 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=13' data-page='13' class='cut-thumb lazyload' alt='Page 13: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/13.jpg' width='140' height='200' /> Page 14 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=14' data-page='14' class='cut-thumb lazyload' alt='Page 14: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/14.jpg' width='140' height='200' /> Page 15 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=15' data-page='15' class='cut-thumb lazyload' alt='Page 15: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/15.jpg' width='140' height='200' /> Page 16 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=16' data-page='16' class='cut-thumb lazyload' alt='Page 16: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/16.jpg' width='140' height='200' /> Page 17 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=17' data-page='17' class='cut-thumb lazyload' alt='Page 17: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/17.jpg' width='140' height='200' /> Page 18 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=18' data-page='18' class='cut-thumb lazyload' alt='Page 18: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/18.jpg' width='140' height='200' /> Page 19 <img data-url='document/unit-ii-unit-ii-laser-characteristics-of-laser-light-stimulated-and-spontaneous.html?page=19' data-page='19' class='cut-thumb lazyload' alt='Page 19: UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader036.cupdf.com/reader036/viewer/2022063010/5fc3a70b7e115e5c133f7c1d/html5/thumbnails/19.jpg' width='140' height='200' />

UNIT II - uafulucknow.ac.inuafulucknow.ac.in/wp-content/uploads/2020/03/Engg_Phy_Unit2.pdf · UNIT II Laser- Characteristics of Laser light, Stimulated and spontaneous emission. Einstein's

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