Lasers Flashcards
lasers use what type of technology
quantum physics - LASER Light Amplification (by) Stimulated Emission (of) Radiation
what part of a laser is the cutting?
the point
coherent
laser light is coherent – all the emitted photons bear a constant phase relationship with each other in terms of phase and time
if incoherent it would be ineffective
T/F the laser light is collimated
True
- keeps it from scattering
energy density with lasers
energy density refers to the actual amount of energy reaching the tissue within the spot size
varies depending on the parameters of energy, divergence, and distance
active medium?
usually defines the laser type
type as like ‘flavor’ of the light wave
what does the operator control?
- power density
- energy density
- pulse repetition
- mode of delivery
mode of delivery
three types
describe
- Continous
- beam emitted at one power level as long as switch foot is pressed - gated/ pulse mode
- similar to continous but mechanicla device that opens and closes to cut off beam (still constantly runnig) but mechanical inhibition - free running pulsed mode
- machine shuts on and off
continous wave means
always on so peak power will = the wattage
peak power definition
refers to the power level in each individual laser pulse and this measurement is not visible to the operator
what is the most important variable dictating how the laser beam will interact with the target tissue
PEAK POWER
thermal relaxation refers to
the ability of the target tissue to absorb heat produced by laser interaction
what is the most important interaction
absorption
chromofore
preferentially absorbs that laser’s energy
