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
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