2010: A Laser Odyssey
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Transcript of 2010: A Laser Odyssey
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2010: A Laser Odyssey
Short presentation about lasers
by the Université Laval OSA and SPIE Student Chapters
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In science fiction, lasers are powerful weapons
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In everyday life, lasers have many uses
• Laser hair removal
• Laser pointers
• CD/DVD players
• Barcode readers
• Micro-fabrication
• Medical treatments
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What is light composed of?
• Light can be seen as photonsof many colors
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What is light composed of?
• Light can also be seen as wavesof different lengths
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In nature, there are different kinds of waves
• Water waves • Sound waves• Light waves (electromagnetic
waves)
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Most of the light waves are invisible
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LASER
LASER is an acronym
ightmplification by thetimulatedmission ofadiation
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A laser emits photons of the same color, travelling in the same direction
Directional and monochromatic light
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A laser has three parts
The gain medium
The pumping system
The resonant cavity
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Lasers consist of a gain medium, a resonant cavity and a pumping system
Gain mediumMaterial in which photons are produced
Pumping systemSystem that provoques the emission of radiation
Resonant cavity (2 mirrors)Cavity in which the light rays bounce back and forth and are amplified
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There are many different kinds of gain media
Crystal Gas Optical fiber
The gain medium, in which the light rays are produced, could be:
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=
• a flash• another laser• electricity
Pumping can be done in different ways
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The resonant cavity consists of two mirrors
One mirror reflects all light
And all this happens at the speed of light:1 080 000 000 km/h!
The other one reflects partially
The mirrors are placed at each end of the gain
medium
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May 16th, 2010: 50th anniversary of the invention of thefirst laser by Theodore
Maiman
First laser: Ruby laser built by Maiman
Maiman and the 1st working laser
Publicity photo
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Thank you for your attention!
Please contact us if you have any questions
www.repol.copl.ulaval.ca