The Basics of Laser (2)
View PDF | Print View
by: Guest
Total views: 48
Word Count: 307
What are the characteristics of laser?
* Monochromatic: has single wavelength depends on the media
* Collimated: the light travels with a synchronized direction with very minimum degree of deviation
* Coherent: electromagnetic wave has the same form and phase
* Brightness: laser seems bright due to the high energy emission in the optic cavity
What is the difference between conventional light source and laser?
Conventional light source has diffuse distribution and is originally white because it consists of many color spectra (multiple wavelengths). Meanwhile, laser has single direction and single color or monochromatic (single wavelength)
What is the benefit of monochromatic characteristic?
Laser energy will be absorbed by specific chromophor of the target organ
What are the basic radiometry terms that you must understand?
Power output = radiant power = W(Watts)= J(Joule)/second
Power density = irradiance = intensity =W/cm2
Light energy = Joules =J
Fluence = energy density = J/cm2
What are the types of laser pulse?
Continues wave: continuous power output while the shutter is being opened (pedal) Pulsed wave: interrupted light output (msec)
Superpulsed wave: very short light outswitched put (msec)
Ultrapulsed: very short light output (nsec)
Q-laser: very short exposure time with extremely high energy
How can the laser interact with the tissues?
Absorption of photon by the tissues is basically the main effect resulted by laser. Reflection, refraction, and transmission will have no effect in the absence of photon absorption.
What are the biological effects on the tissues?
Cells’ growth stimulation, increased cell regeneration, increased tissues’ activities, anti-inflammatory effect, reduced swelling/edema, increased microcirculation, less fibrosis, stimulation of nerves’ function, pain attenuation due to increased production of local endorphins, and increased ATP production in mitochondria
What does photothermal effect of laser mean?
Photothermal effect of laser is thermal effect resulted by the photon which directly related to kinetic molecule excitation produced by total movement, rotation, and molecular action of the tissues. Photothermal effect may cause an increase in temperature, coagulation, protein denaturation, hemostasis, carbonization, and tissue evaporation.
Related: The Basics of Laser (2)
Additional information:
Adolf Hitler used the theory of eugenics in his quest to create a master race, legitimizing the murder of thousands deemed unfit for the German.
Rating:
Not yet rated
Comments
No comments posted.
Add Comment
You do not have permission to comment. If you
log in, you may be able to comment.
