Ch6Sec3 - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 6.3 2 Section 6.3 Laser Principles HeNe Laser λ = 0.633 μ m (red) Fiber applications of the HeNe Laser 1. Test for Continuity. Visual inspection for breaks. Fiber 2. Measure NA Fiber 2 α NA = sin α Scattered Light Output Light
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Joseph C. Palais 6.3 3 HeNe Laser Mirror Mirror L HeNe Gas Tube Power Supply E Output LASER PRINCIPLES Window z
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Joseph C. Palais 6.3 4 Energy Level Diagram He Neon 170,000 160,000 150,000 Energy (J) W u W l W p ) ( 1 Number Wave 1 - cm λ LASER PRINCIPLES
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Joseph C. Palais 6.3 5 hc W c h hf W = = = λ 1 The allowed energy states are shown. They are discrete in a gas. They are energy bands in a solid. LASER PRINCIPLES 1 Wavenumber
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Joseph C. Palais 6.3 6 Ground state lowest energy state. Excited state higher energy state. An atom can be excited by: 1. Absorption of an incident photon. 2. Absorption of energy in a collision with a fast moving particle. 3. Absorption of energy by transfer from another excited atom. LASER PRINCIPLES
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6.3 7 For the HeNe laser: The power supply ionizes the gas. Free electrons accelerate towards the positive electrode, gaining kinetic energy. They collide with the helium atoms, exciting them to the level 1 1 167,800
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This note was uploaded on 05/11/2010 for the course EEE EEE-448 taught by Professor Palais during the Fall '09 term at ASU.

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Ch6Sec3 - THE FIBER FORUM Fiber Optic Communications...

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