low level laser therapy Flashcards
what does LASER mean
light amplified by stimulated emission of radiation
exp the concept behind laser
photon from amplified light hits an excited atom = radiation
compare normal light waves vs LASER waves in terms of wavelength
light - multiple wavelength
laser - monochromatic; same wavelength
compare normal light waves vs LASER waves in terms of allignment of waves
light - diverged; not parallel
laser - collimated; parallel and non-divergin
compare normal light waves vs LASER waves in terms of direction of waves
light - dispersed; multidirectional
laser - coherent; unidirectional
exp spontaneous absorption
electron moves towards outer ring = absorbs radiation
exp spontaneous emission
electron moves towards inner ring = creates radiation but not monochromatic
exp stimulated emission
electron moves towards inner ring = creates radiation but is monochromatic
longer wavelength = _____ freq
lower frequency
shorter wavelength = _____ freq
higher frequency
longer wavelength and lower freq = _____ penetration
DEEP; IR light - 2-4 cm
shorter wavelength and higher freq = _____ penetration
superficial; red light - few mm
what is power
rate of energy flow
unit for power
mW
what is power density
amount of power per unit area
unit for power density
mW/cm^2
maximum power density
100 mW/cm^2