ENGRI_111_12_photonics3(2)

ENGRI_111_12_photonics3(2) - ENGRI 111 Photonics III...

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ENGRI 111 ENGRI 111 Photonics - III
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Diamond C, Si, Ge GaAs Zinc blende Diamond and Zinc Blende Structures Diamond and Zinc Blende Structures
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Compound Semiconductors Compound Semiconductors
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Band Gap Engineering (III-V) Band Gap Engineering (III-V) Band Gap scales with lattice constant III-V S e m ic o nduc to rs  and S o lid S o lutio ns
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Band Gap Comparisons Band Gap Comparisons Compoun Compoun d d Δχ Δχ Eg Eg Ge 0 0.7 GaAs 0.4 1.4 ZnSe 0.8 2.7 CuBr 0.9 2.9 Lattice Parameter ~ 0.57 nm
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Lasers Lasers   L ight  A mplification by  S timulated  E mission of  R adiation  Invented in 1958 by Charles Townes in 1958 maser
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Lasers Lasers Light from lasers is Monochromatic Contains specific wavelength or energy Coherent “organized” – each photon moves in step with the others – (in- phase) Directional Strong, concentrated tight beam Flash light – many directions, weak, diffuse 
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Laser Types Laser Types Solid-state lasers: Nd:YAG Gas lasers: HeNe Excimer lasers: Cl 2 /Ar Dye lasers: Rhodamine 6G Semiconductor lasers
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