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  2. Laser diode - Wikipedia

    en.wikipedia.org/wiki/Laser_diode

    The laser diode chip removed and placed on the eye of a needle for scale A laser diode with the case cut away. The laser diode chip is the small black chip at the front; a photodiode at the back is used to control output power. SEM (scanning electron microscope) image of a commercial laser diode with its case and window cut away. The anode ...

  3. Semiconductor laser theory - Wikipedia

    en.wikipedia.org/wiki/Semiconductor_laser_theory

    Semiconductor lasers or laser diodes play an important part in our everyday lives by providing cheap and compact-size lasers. They consist of complex multi-layer structures requiring nanometer scale accuracy and an elaborate design. Their theoretical description is important not only from a fundamental point of view, but also in order to ...

  4. Laser - Wikipedia

    en.wikipedia.org/wiki/Laser

    However, due to the cost and potential dangers, this is an uncommon hobby. Some hobbyists salvage laser diodes from broken DVD players (red), Blu-ray players (violet), or even higher power laser diodes from CD or DVD burners. [127] Hobbyists have also used surplus lasers taken from retired military applications and modified them for holography ...

  5. Tunable laser - Wikipedia

    en.wikipedia.org/wiki/Tunable_laser

    A typical laser diode. When mounted with external optics, these lasers can be tuned mainly in the red and near-infrared. Sample Grating Distributed Bragg Reflector lasers (SG-DBR) have a much larger tunable range; by the use of vernier-tunable Bragg mirrors and a phase section, a single-mode output range of > 50 nm can be selected.

  6. Laser diode rate equations - Wikipedia

    en.wikipedia.org/wiki/Laser_diode_rate_equations

    The laser diode rate equations model the electrical and optical performance of a laser diode. This system of ordinary differential equations relates the number or density of photons and charge carriers in the device to the injection current and to device and material parameters such as carrier lifetime, photon lifetime, and the optical gain.

  7. Optical isolator - Wikipedia

    en.wikipedia.org/wiki/Optical_isolator

    Optical isolator for laser experiments An optical isolator , or optical diode , is an optical component which allows the transmission of light in only one direction. It is typically used to prevent unwanted feedback into an optical oscillator , such as a laser cavity .

  8. Distributed-feedback laser - Wikipedia

    en.wikipedia.org/wiki/Distributed-feedback_laser

    A distributed-feedback laser (DFB) is a type of laser diode, quantum-cascade laser or optical-fiber laser where the active region of the device contains a periodically structured element or diffraction grating. The structure builds a one-dimensional interference grating (Bragg scattering), and the grating provides optical feedback for the

  9. Quantum well laser - Wikipedia

    en.wikipedia.org/wiki/Quantum_well_laser

    A quantum-well laser is a laser diode in which the active region of the device is so narrow that quantum confinement occurs. Laser diodes are formed in compound semiconductor materials that (quite unlike silicon ) are able to emit light efficiently.