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

Lec-4 Laser Fundamentals & its Applications 17 Feb...

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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. Coherence • Coherent light is in phase and has the same wavelength. Photonic Network By Dr. M H Zaidi Laser application Optical communications Unguided systems • Deep space communications (Line of sight communications). Guided systems • Optical fiber communications (claded dielectric waveguide). Military applications • Laser range finding. • Pinpointing target for bombs and missiles. • Anti sensor weapons • Anti satellite weapons • Anti missile weapons • Battle simulation • Simulating effect of nuclear weapons.
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5 Photonic Network By Dr. M H Zaidi Laser for tactical military applications ATLIS POD Air to ground “Automatic Tracking and Laser Illumination System” to deliver LGBs. Pin point accuracy of laser illumination provided to laser guided weapon. High Laser power enables use at distance beyond enemy ground to air weapons. Advance optical system offers several fields of vision and very high magnification. Photonic Network By Dr. M H Zaidi Laser Fundamentals Active Medium • Collection of atoms, molecules, or ions that emit radiation in the optical part of the electromagnetic spectrum. Population Inversion • Generated by pumping Resonant Cavity • Provides optical feedback Spontaneous Emission • It occurs without any external simulation Stimulated Emission • It occurs when atom in exited state interacts with an incident quantum of light energy at the transition frequency.
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6 Photonic Network By Dr. M H Zaidi
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Lec-4 Laser Fundamentals & its Applications 17 Feb...

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