Lec-4 Laser Fundamentals & its Applications (17 Feb 2011) P-1

Lec-4 Laser Fundamentals & its Applications (17 Feb 2011) P-1

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1 Photonic Network By Dr. M H Zaidi Laser Fundamentals and its Applications Photonic Network By Dr. M H Zaidi LASER LASER is acronym of L ight A mplification by S timulated E mission of R adiation. http://www.semicon.toshiba.co.jp
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2 Photonic Network By Dr. M H Zaidi Lasers Photonic Network By Dr. M H Zaidi Outline Introduction and Overview Theory of Operation Laser Exposition Properties of Laser Beam Applications • Optical Communication • Military Applications Conclusion
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3 Photonic Network By Dr. M H Zaidi Introduction and Overview Laser Invention Landmark achievement of previous century Important industrial and research tool in fields from medicine to communications engineering What is a LASER ? Acronym: Light Amplification stimulated emission of radiations Laser light is special light Ordinary light --- Spontaneous emission Laser light --- Stimulated emission Stimulated emission first postulated by Albert Einstein in 1917 In 1950’s Charles Townes group invented laser In 1960 T.H.Maiman invented first laser Photonic Network By Dr. M H Zaidi Incandescent vs. Laser Light 1. Many wavelengths 2. Multidirectional 3. Incoherent 1. Monochromatic 2. Directional 3. Coherent
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4 Photonic Network By Dr. M H Zaidi Properties of Laser Light Mono chromaticity • Light of a single wavelength. Directionality • A Laser Beam is so directional that it can be easily seen from the moon or reflected back to the earth and detected here. Brightness • A 1 mw He-Ne Laser is 100 Times brighter than the sun. • Focused Laser beam is so intense that it can initiate nuclear reactions.
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Lec-4 Laser Fundamentals & its Applications (17 Feb 2011) P-1

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