用LLLT装置治疗男性型秃头症
we are providing energy in the “right” wavelength for our
purpose, let’s discuss
energy delivery. Laser fluence is a measure used to
describe the energy delivered per
unit (or effective) area. Within the community of laser
scientists and technicians it is very
common to describe fluence in units of Joules per
centimeter, squared (J/cm2). The
important variables to consider when calculating fluence
are 1) the shape of the beam
(e.g. Gaussian, flat-top, semiconductor beam), 2) the
distance to target, and 3) the
duration of time the light is emitting (pulse width). Without
delving into too much technical detail, the important thing to know about
Gaussian beams is that the intensity of light is highest at point of origin.
Consider Figure 1 to the left. The light is most intense at the peak of the
curve, and loses intensity exponentially as it travels outward from the origin.
This is a common shape for the output of laser diodes which commonly do not
have
focusing
lenses.
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