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Lasers - Coggle Diagram
Lasers
Design
Energy source
another laser
another light source
electrical current
Pumping
Gain medium
Physics
Pumplng raises electrons to higher levels
Photons emitted on high->low transition
Very specific wavelengths
Incoming photon stimulates
Outgoing photons coherent
electrons in discrete levels
Feedback
Light escapes through mirror
Optical cavity
Two mirrors !
Not always required
History
Maser
1953,charles townes
Microwave laser
Laser
Bell labs
1958 bell labs patent
1957,charles townes & arthur schawlow
Columbia U.
1957, Gordon Gould
Invented LASER
Included open resonator
Patent denled
Operation
Continuous
steady pump source
not possible for very high powers !
Pulsed
uses often need high power
laser ablation
Weapons
Sharks
Low pulse rate
high energy with low power
Q-Switching
Gw peak
1958, gordon gould
variable attenuator in resonator
Laser light
Spatial coherence
Single phase
Constant amplitude
Very narrow bandwidth
Diffration limited spread
Light
Amplification by
Stimulated
Emission of
Radiation