7_Laser Diodes 3080 Logan Woods

7_Laser Diodes 3080 Logan Woods - LaserDiodes LoganWoods...

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Laser Diodes Logan Woods
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Overview pn junction (diode) with depletion region Powered by charge injection or optical pumping Recombination creates photon with specified wavelength
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LED vs. Laser Diode LED Laser Incoherent light out of phase Coherent light in phase Linear output until thermal limitations Low output until threshold current Lower efficiency(38% Theoretically) Higher efficiency (80% Theoretically) Wider spectrum Narrow spectrum (<5nm) Spontaneous Emission Stimulated Emission Higher Divergence Low Divergence
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Basic Manufacturing Direct bandgap semiconductors allow photon emission Usually use III V Compound semiconductors (GaAs, InP, GaSb, GaN) Checkerboard pattern of alternating atoms Fabry Perot resonator used to reflect photons several times before emission
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Double Heterostructure Lasers Quantum Well Lasers Quantum Cascade Lasers Separate Confinement Heterostructure Lasers Distributed Feedback Lasers
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7_Laser Diodes 3080 Logan Woods - LaserDiodes LoganWoods...

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