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Introduction To Lasers Poster 2

1. Lasers emit a coherent, focused beam of light through stimulated emission. Physicists invented lasers to create powerful beams of light. 2. A laser works by exciting a gain medium like gas or semiconductor, amplifying photons through stimulated emission, and reflecting photons within an optical cavity to produce a concentrated beam. 3. Lasers have applications in medicine, manufacturing, communication, and more due to their precision, efficiency, and minimal collateral damage. Researchers are developing new laser applications in computing, ultrafast pulses, weapons, and space travel.

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109 views8 pages

Introduction To Lasers Poster 2

1. Lasers emit a coherent, focused beam of light through stimulated emission. Physicists invented lasers to create powerful beams of light. 2. A laser works by exciting a gain medium like gas or semiconductor, amplifying photons through stimulated emission, and reflecting photons within an optical cavity to produce a concentrated beam. 3. Lasers have applications in medicine, manufacturing, communication, and more due to their precision, efficiency, and minimal collateral damage. Researchers are developing new laser applications in computing, ultrafast pulses, weapons, and space travel.

Uploaded by

aarushraj0001
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Introduction to Lasers

Welcome to the fascinating world of lasers! The fear for darkness vanished when
man discovered fire till then man knew only the natural source of light later light
sauce evolved into different artificial forms physicists had work to create devices
for producing powerful beam of light this resulted in the invention of lasers.
What is a Laser?
A laser stands for "Light Amplification by Stimulated Emission of
of Radiation." It is a device that emits a coherent, focused beam of
beam of light through the process of stimulated emission.
How Does a Laser Work?
1. Excitation

An external energy source stimulates the laser medium, such as a gas, solid, or semiconductor, to a higher energy
higher energy level.

2. Amplification

The excited atoms release photons, triggering a chain reaction as photons stimulate other atoms to emit more
emit more photons of the same wavelength and phase.

3. Feedback

Mirrors at each end of the laser cavity reflect the photons back and forth, amplifying them further and producing a
and producing a highly concentrated, coherent beam.
The Components of a Laser
1 Gain Medium 2 Pump Source
The material that produces the light of A device that supplies energy to excite
the laser, such as a crystal or gas. excite the gain medium, such as a flash
flash lamp or diode laser.

3 Optical Cavity
A structure containing mirrors that form a resonator, confining light to produce the laser
the laser beam.
Types of Lasers

Ruby Laser CO2 Laser Semiconductor Laser


A solid-state laser using a A gas laser that uses a mixture of A compact laser based on a
synthetic ruby crystal as the gain carbon dioxide, nitrogen, and semiconductor diode that
gain medium, producing red helium to generate an infrared produces a direct current (DC)
light. beam for cutting and engraving (DC) electrical pump.
applications.
Applications of Lasers
1 Medicine
Laser surgery, skin treatments, eye
surgery, and diagnostic techniques.
Manufacturing 2
Precision cutting, welding, marking,
micromachining, and 3D printing.
3 Communication
Fiber-optic systems for high-speed data
data transmission and laser-based satellite
satellite communication.
Advantages and Disadvantages of Lasers

Advantages Disadvantages
• Precision and accuracy • High initial cost
• High energy efficiency • Eye hazards if not used properly
• Non-contact process • Requires skilled personnel
• Minimal damage to surrounding material • Restricted to specific materials and
applications
Future Directions of Laser Technology
The future of lasers holds immense potential. Researchers are developing new applications such as quantum
computing, ultrafast lasers, laser weapons, and even harnessing laser energy for space travel.

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