Module 1 Flashcards
1
Q
First working laser device from whom and when?
A
Theodore Maiman
1960
2
Q
What is the LASER acronym?
A
Light Amplification Stimulated Emission of Radiation
3
Q
Ordinary light characteristics?
A
multiple wavelengths (colors)
non-collimated
incoherent
4
Q
Laser irradiation characteristics?
A
monochrome
coherent (in phase; same wavelength)
collimated (parallel)
5
Q
Unit of wavelength
A
micron 10^-6
nanometer 10^-9
6
Q
unit of pulse duration
A
PICO, Nano
7
Q
Unit of pulse repetition
A
Hz
8
Q
Unit of energy
A
J or mJ
9
Q
Unit of power average and peak
A
W
10
Q
Unit of energy density/fluence
A
J/cm^2
11
Q
Unit of power density
A
W/cm^2
12
Q
What is population inversion?
A
- more atoms in excited state, more opportunities for stimulated emission to occur
- situation that allows avalanche principle to occur
13
Q
ionizing radiation?
A
charged portion (electron) given enough energy to break away from atom
14
Q
non-ionizing radiation?
A
laser light
enough energy for excitation to a higher state ONLY
15
Q
What laser in visible range?
A
Argon
I.e. Diagnodent
