Introduction to LASER by R S Anwane Department

Introduction to LASER by R S Anwane Department of Basic Sciences & Humanities SVPCET, Nagpur

Introduction to LASER Contents: ª Light sources ª LASER definition ª Properties of LASER light ª Types of Lasers

Light sources SUN LASER Flashlight Light Source Light Power Density Sun 1026 Watt 5 x 102 W/cm² 100 W Filament Lamp 3 Watt 10 -2 W/cm² He-Ne Laser 1 m. W 4 x 104 W/cm² CO 2 Laser 60 Watt 5 x 106 W/cm² Pulsed Laser 1 GWatt 1014 W/cm²

LASER Definition L A S E R Light Amplification Stimulated Emission Radiation of by

Properties of LASER Light Monochromaticity: Nearly monochromatic light in LASER Example: He-Ne Laser Diode Laser λ 0 = 632. 5 nm Δλ = 0. 2 nm λ 0 = 900 nm Δλ = 10 nm Comparison of wavelengths of red and blue light

Properties of LASER Light Directionality: Divergence angle (θd) Beam divergence: θd= β λ /D Conventional source β~ 1 = f(type of light amplitude distribution, definition of beam diameter) λ= wavelength D=beam diameter

Properties of LASER Light Coherence: Coherent light waves from LASER source Incoherent light waves from conventional source

Properties of LASER Light Intensity: Due to high monochromaticity, directionality and coherence, LASER light can deposit lot of energy in a small area. Thus, LASER light is far more intense than any other source of light

Types of Lasers Gas Lasers Solid State Lasers Semiconductor Lasers Excimer Lasers etc

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