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Light diverges significantly laser light is

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Unformatted text preview: is from spontaneous emission (random events in time and thus phase). •Light diverges significantly •LASER •Light is essentially single wavelength (highly monochromatic) •Light is from “stimulated emission” (timed to be in phase with other photons •Light has significantly lower divergence (Semiconductor versions have more than gas lasers though). Georgia Tech EE 332 Spring 2013 ECE 3080 - Dr. Alan Doolittle (through Stimulated emission) (through Stimulated emission) to to Using Mirrors and OpticalLight” “Amplify the Gain “Amplify the Light” The ends of the chip form partially reflective mirrors, which allows the photons to be reflected back and forth and thus be exposed to gain for a longer period of time. The ends of the chip form partially reflective mirrors, which allows the photons to be reflected back and forth and thus be exposed to gain for a longer period of time. Georgia Tech Georgia Tech ECE 3080 - Dr. Alan Doolittle ECE 3080 - Dr. Alan Doo EE 332 Spring 2013 How Does A Laser Work? EE 332 Spring 2013 Cavity Modes used in Wavelength Cavity Modes used in Wavelength Selection Selection Cavity Modes Used in Wavelength Selection Wavelengths that are integer multiples of half the cavity’s length can resonate, interfering constructively. Wavelengths that are integer multiples of half the cavity’s length can resonate, interfering constructively. Other wavelengths die out eventually. Other wavelengths die out eventually. Georgia Tech Georgia Tech ECE 3080 - Dr. Alan Doolittle ECE 3080 - Dr. Alan Doolitt EE 332 Spring 2013 Cavity Modes used in Wavelength Selection Cavity Modes Used Selection in Wavelength Selection onances of a Fabry-Perot cavity. The width of the resonances depends on the reflectivity R of the . The resonances of a Fabry-Perot cavity. The width of the resonances depends on the reflectivity R of the mirrors. gia Tech Georgia Tech ECEECE 3080 - Dr. Alan Doolittl 3080 - Dr. Alan Doolittle EE 332 Spring 2013 Wavelength Selection Wavelength Selection Cavity Modes + Gain evelopment of la...
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