Topic 25 Flashcards
1
Q
What is the principle of a laser?
A
Light Amplification by Stimulated Emission of Radiation
2
Q
What is stimulated emission?
A
One atom emits a photon, this collides with a second atom in an excited state.
This stimulates the second atom to release a photon
Results in two coherent photons
3
Q
What is an inverse population
A
More atoms in upper state than lower state
Material can be maintained which irradiated with light
Material can be maintained inversely by finding an intermediate excited state.
4
Q
The properties of a laser
A
Monochromatic
Coherent
Directed (Parallel in nature)
Well focusable
5
Q
Give the types of laser
A
Fixed/Tunable wavelength
Continuous/pulsed lasers
6
Q
Give the medical use of lasers
A
Destruction of small size tissues, healing ulcers, cornea surgery
