ece228 lecture 11 [Compatibility Mode]

ece228 lecture 11 [Compatibility Mode] - Bowers ECE 228A...

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Bowers ECE 228A Laser Design Lecture #11 John Bowers ECE 228A Read Chapter 3
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Bowers ECE 228A Semiconductor Optical Source Basics Current injection Semiconductor p- n junction Light generation Laser LED No Optical Feedback Optical Feedback
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Bowers ECE 228A Semiconductor Lasers Laser = Gain medium + optical cavity Lasing occurs with population inversion or when gain Lasing occurs with population inversion or when gain exceeds losses Ex : Double Heterostructure laser I bias Light Contact layer p-InP Cleaved facets Light n-InGaAsP N-InP
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Bowers ECE 228A Optical and quantum confinement A heterostructure is a p-n junction between materials with dissimilar bandgaps Used to confine: Carriers (efficiency) and Photons (waveguide) ergy P-type N-type I j t d l t ectron Ene Injected electrons ------ +++++++ Ele Injected holes ex Optical Mode Optical gain active Inde n 1 Optical waveguiding Refra n 2 n 2
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