Lasers Flashcards
What laser wavelength is best for treating scar erythema?
595 PDL laser (Pulse Dye Laser)
what is the penetration of a CO2 laser
1mm
ErYag laser is what wavelength?
2940 (infrared light frequency)
name three properties of laser electromagnetic radiation.
- monochromaticity - all the same wavelength
- coherence - the wavelengths travel in phase
- collimation - the wavelengths travel in parallel
how is a photon made?
energy pump excites the laser media exciting electrons when electrons drop back to their normal energy level they release a photon.
at what wavelength does uvb become uva
315
What wavelength does uvb start and below becomes UVC
280
In what phase is it easier to do laser hair removal anagen catagen or telogen
anagen more melanosomes during growth phase.
what wavelength does melanin absorb light
600-1200nm
What does the acroynm LASER stand for?
Light Amplification by Stimulated Emission of Radiation
What are photons
electromagnetic radiation
What type of dye is used in Pulse Dye Lasers
Rhodamine dye (liquid laser Media)
If the laser medium is a semiconductor what type of laser is it?
Diode
what is the wavelength of the CO2 laser
10600nm
what wavelength does the diode laser fall in
800nm infrared
why does penetration decrease at 1300nm if the longer wavelengths penetrate deeper
Because at 1300nm and above water is a target and the photons get absorbed so there is less penetration.
what is the wavelength for the alexandrite laser
755
what is the wave length for the Ruby laser
694
whats the wavelenght for KTP laser
532
What’s the wavelenght for PDL
585-600
calculate the Thermal reaction time of a chromophore .1 microns
chromophore .5 microns
Thermal Reaction time is = chromophore diameter squared
10 nanoseconds
250 nanoseconds
When do you see suture granulomas (time frame) and what suture material is most associated with them?
1-3 months
Vicryl (polyglcan 910)
what is the doseage interval for post op pain management for skin surgery and dose amounts first line therapy
Tylenol one gram q8 hours with Ibuprofen q4 hours
What is the most effective wave lenght for sunburn
300nm
what is the genetic DNA damage by UVB
Cyclobutane-pyrimidine dimers which thymine-thymine dimers are most common.
imediate pigment darkening and persistant darking from UV is due to what?
Photo oxidation of melain
