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NALI Section 2

TermDefinition
eye damage can be effected from? the laser wavelengths
wavelength DISTANCE from one wave top to the next.
frequency # of waves passed PER TIME INTERVAL
what does LASER stand for? light amplification by stimulated emission of radiaion
monochromatic all light produced by the laser is of ONE WAVELENGTH OR COLOR
coherence all waves are IN PHASE with each other
nanometer nm is one billionth of a meter
what is light? the color or light determined by FREQUENCY or WAVELENGTH
what are the 4 components of a laser? the LASER MEDIUM, SOLID, LIQUID, AND GAS
Optical cavity/ resonator surrounds LASER MEDIUM and contains the AMPLIFICATION PROCESS
Power supply 'pump' that EXCITES ATOMS and creates POPULATION INVERSION
Delivery system a ARTICULATING ARM w/ mirrored joints to DELIVER light to TARGET
how do lasers work? produces PURE HIGH ENERGY, DIRECTED LIGHT
whats the anatomy of a laser? mirrors align with photons; traveling PARALLEL allows TRANSMISSION of laser light
what are the 3 special properties of laser light? monochromatic collimated coherence
what does STAR stand for? SCATTERED, TRANSMISSION, ABSORPTION, REFLECTION
selective photothermolysis? target chromophore ABSORBS light energy and CONVERTS the LIGHT into HEAT.
thermal relaxation time (TRT) time for target chromophore to dissipate 63% incident thermal energy
thermal damage time (TDT) time for entire target including primary chromophore ex. melanin
what is fluence and what is it measured by? amount of ENERGY delivered. measured in Joules/cm2
pulse duration measured as TIME INTERVALS between PULSES EX. microsecond, nanosecond, picosecond
pulse duration is determined by? TARGET SIZE; smaller targets need SHORTER pulse durations
optical density degree to which PROTECTIVE EYEWEAR to use.
joule is the measurement of? ENERGY
collimation different wavelengths travel all directions "not parallel"
how does light interact with tissue? wavelength
light of a specific wavelength is selectively absorbed by? target chromophore
exposure (pulse width) less than THERMAL RELAXATION TIME of the chromophore
sufficient fluence (energy) reaches the chromophore to DESIRED EFFECT
chromophores target of LASERS ex. water
what 4 components of skin that absorb light? MELANIN,HEMOGLOBIN, INTRACELLULAR WATER, TATTOO INK
Created by: alliefoster
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