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HomeHomework HelpphysicsLasers

Lasers

A device that produces an intense, directional beam of light by amplifying light through stimulated emission, with characteristics such as coherence, monochromaticity, and high intensity, and has various types including He-Ne and semiconductor lasers

intermediate
3 hours
Physics
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Overview

Lasers are fascinating devices that produce light through a process called stimulated emission. They are characterized by their coherence, monochromaticity, and ability to focus light into a narrow beam. Understanding the principles behind lasers is essential for their application in various fields,...

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Key Terms

Stimulated Emission
The process by which an incoming photon causes an excited atom to release a second photon.

Example: In lasers, stimulated emission amplifies light.

Coherence
The property of light waves to maintain a constant phase relationship.

Example: Laser light is coherent, allowing for focused beams.

Monochromatic Light
Light that has a single wavelength or color.

Example: Lasers emit monochromatic light, unlike white light.

Optical Cavity
A space where light bounces between mirrors to amplify it.

Example: The optical cavity is essential for laser operation.

Population Inversion
A condition where more atoms are in an excited state than in a lower energy state.

Example: Population inversion is necessary for laser action.

Gas Laser
A type of laser that uses gas as the medium for light amplification.

Example: Helium-neon lasers are common gas lasers.

Related Topics

Optical Fibers
Study of light transmission through fibers, crucial for communication technologies.
intermediate
Quantum Mechanics
Understanding the behavior of matter and energy at the quantum level, relevant to laser technology.
advanced
Photonics
The science of generating and manipulating photons, essential for laser applications.
intermediate

Key Concepts

Stimulated EmissionCoherenceMonochromatic LightApplications of Lasers