Vertical cavity surface emitting laser semiconductor lasers ece 631
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VERTICAL CAVITY SURFACE EMITTING LASER (SEMICONDUCTOR LASERS) ECE 631 PowerPoint PPT Presentation


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VERTICAL CAVITY SURFACE EMITTING LASER (SEMICONDUCTOR LASERS) ECE 631. INSTRUCTOR: Prof. Celal Zaim Çil Reşat ŞEKER 2013. HOW IT WORKS: Homojunction Structures.

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VERTICAL CAVITY SURFACE EMITTING LASER (SEMICONDUCTOR LASERS) ECE 631

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Vertical cavity surface emitting laser semiconductor lasers ece 631

VERTICAL CAVITY SURFACE EMITTING LASER(SEMICONDUCTOR LASERS)ECE 631

INSTRUCTOR: Prof. Celal Zaim ÇilReşat ŞEKER 2013


How it works homojunction structures

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.


Vertical cavity surface emitting laser semiconductor lasers ece 631

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


Heterojunction lasers quantum cascade lasers

Heterojunction Lasers (Quantum cascade Lasers)

  • QCLs are typically based upon a three level system.


Quantun confined materials properties of bulk inorganic semi conductors

Quantun confined materials Properties of bulk inorganic semi conductors


Quantum confined structures as lasing media

QUANTUM CONFINED STRUCTURES AS LASING MEDIA


Applications

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


Properties

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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