Lecture21

Lecture21

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Unformatted text preview: sing. (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 LASER Wavelength Design LASER Wavelength LASER Waveguide Design Design Adjusting the depth and width of quantum wells to select the wavelength of emission is one form of band-gap djusting the depth shaded areas quantum the width of the well to illustrate the degree of form of band-gap engineering. The and width of indicate wells to select the wavelength of emission is one confinement of the gineering. The shaded areas indicate the width of the well to illustrate the degree of confinement of the mode. ode. Georgia Tech Georgia Tech ECE 3080 - Dr. Alan Doolittle EE Dr. Alan Doolittle ECE 3080 - 332 Spring 2013 Stripline or Edge Emitting LASER Stripline or Edge Emitting LASER The output pattern of a simple “stripline”, edge-emitting laser is elliptical and widely divergent. Georgia Tech ECE 3080 - Dr. Alan Doo EE 332 Spring 2013 Vertical Cavity Surface Emitting Laser Surface Emitting LASER (VECSEL) Vertical Cavity Surface Emitting Laser (VECSEL) • • A vertical cavity surface-emitting laser. (After Ueki et al., IEEE Photonics Technology Letters, 11, no. 12, pp. 1539–1541, 1999, © IEEE.) Distributed Bragg Reflectors (DBR) mirrors require very precise growth control. Refreactive index is varied as much as possible (while still remaining electrically conductive) and must be a precise fraction of a wavelength Georgia Tech EE 332 Spring 2013 ECE 3080 - Dr. Alan Doolittle...
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This document was uploaded on 02/18/2014.

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