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Questions and Answers
What happens to the Fermi level of n-type semiconductor due to high doping?
What condition is achieved when the population density of electrons and holes is high around the junction?
What is the result of the recombination of electrons and holes in the junction region?
What triggers the chain of stimulated recombination resulting in the release of LASER light?
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What happens to the light production when the forward-biased voltage is increased in a laser diode?
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Study Notes
Semiconductor Laser Diode
- A semiconductor laser diode is a p-n junction device specifically designed to emit coherent light when forward biased.
- The p and n regions of the diode are highly doped to facilitate efficient operation.
Working Principle
- Forward biasing the p-n junction allows electrons from the n region and holes from the p region to recombine at the junction.
- The recombination of electrons and holes releases energy in the form of light, known as recombination radiation.
- Certain semiconductors, like Gallium Arsenide (Ga-As), are specifically used due to their direct band gap properties.
- The emitted photons can trigger further recombination events, leading to stimulated emission, a fundamental process for laser operation.
Characteristics of Laser Diodes
- The active medium used in semiconductor laser diodes typically consists of Gallium Arsenide (GaAs).
- The heavy doping of the p-n junction enhances the efficiency and coherence of the emitted light.
- Laser diodes are essential in various applications due to their compact size and efficiency in producing laser light.
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Description
Test your knowledge of semiconductor laser diodes with this quiz. Explore the working principle, fabrication, and applications of these optoelectronic devices. See how much you know about the physics behind laser diodes.
