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VERTICAL CAVITY SURFACE EMITTING LASER (SEMICONDUCTOR LASERS) ECE 631

This guide delves into how semiconductor lasers work, focusing on homojunction and heterojunction structures, explaining their functioning and applications in various fields like military, communication, medical surgery, entertainment, and more, highlighting key properties and advantages.

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VERTICAL CAVITY SURFACE EMITTING LASER (SEMICONDUCTOR LASERS) ECE 631

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  1. VERTICAL CAVITY SURFACE EMITTING LASER(SEMICONDUCTOR LASERS)ECE 631 INSTRUCTOR: Prof. Celal Zaim ÇilReşat ŞEKER 2013

  2. HOW IT WORKS:Homojunction Structures Semiconductor lasers are diodes which are electrically pumped. Recombination of electrons and holes created by the applied current introduces optical gain. Reflection from the ends of the crystal form an optical resonator, although the resonator can be external to the semiconductor in some designs.

  3. Heterojunction Lasers (Quantum cascade Lasers) Electron and holes energies are quantized in the confinement direction (Z or thickness in this case) and continuous in other two directions

  4. Heterojunction Lasers (Quantum cascade Lasers) • QCLs are typically based upon a three level system.

  5. Quantun confined materials Properties of bulk inorganic semi conductors

  6. QUANTUM CONFINED STRUCTURES AS LASING MEDIA

  7. APPLICATIONS • Military Applications (Target maker-Range Finder) • Communication Systems (Fiberoptic transmitters) • Medical Surgery • Optic Media (Cd-DVD-BlueRay Reader Writer) • Measurement Systems (3d Scanners - Surveying equipment, total stations- laser meters) • Entertainment (Laser shows) • Printer technology

  8. Properties - Consists of quantum structures • Small size • Non-maintenance • Long life time • Simple usage • Too many usage area • Stability • Tunable wavelenght

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