ENGRI_111_12_photonics3 - EN GRI 111 EN GRI 111 Photonics -...

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Unformatted text preview: EN GRI 111 EN GRI 111 Photonics - I I I Diamond C, Si, Ge GaAs Zinc blende Diamond and Zinc Blende Structures Diamond and Zinc Blende Structures Compound Semiconductors Compound Semiconductors Band Gap Engineering (III-V) Band Gap Engineering (III-V) Band Gap scales with lattice constant I I I -V Semiconductors and Solid Solutions Band Gap Comparisons Band Gap Comparisons Compou Compou nd nd Eg Eg Ge 0.7 GaAs 0.4 1.4 ZnSe 0.8 2.7 CuBr 0.9 2.9 Lattice Par ameter ~ 0.57 nm Lasers Lasers L ight A mplification by S timulated E mission of R adiation I nvented in 1958 by Charles Townes in 1958 maser 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 Laser Types Laser Types Solid-state lasers: Nd:YAG Gas lasers: HeNe Excimer lasers: Cl 2 / Ar Dye lasers: Rhodamine 6G Semiconductor lasers Lasers...
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ENGRI_111_12_photonics3 - EN GRI 111 EN GRI 111 Photonics -...

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