Lecture19

The width of the resonances depends on the

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Unformatted text preview: ction 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 lasing. (a)(a) The gain distribution is thsame as the spontaneous emission spectrum. (b) Only Development of lasing. The gain distribution is the e same as the spontaneous emission spectrum. (b) Only he the photons thethe resonance will amplify. The ones nearhe center of the gain curve will amplify the fastest. photons at at resonance will amplify. The ones near t the center of the gain curve will amplify the fastest. Georgia Tech Georgia Tech ECE 3080 --Dr. Alan Doolittle ECE 3080 Dr. Alan Doolittle EE 332 Spring 2013 Edge and Surface Emitting LASERs Emitting Vertical Cavity Surface ipline or Edge Emitting LASER (VECSEL) • A vertical cavity surface-emitting laser. (After Ueki et al., IEEE Photonics Technology pp. 1539–1541, 1999, © IEEE.) attern of a simple “stripline”, edge-emitting laser is elliptical and widely divergent.Reflectors (DBR) mirrors require very precise growth control. Re • Distributed Bragg varied as much as possible (while still remaining electrically conductive) and must be of a wavelength VECSEL Georgia Tech ECE 3080 - Dr. Alan Doolittle ECE 3 EE 332 Spring 2013...
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