Surgeon's hand, guiding a light ray, Laser, instead of holding a
common lancet, for dissecting delicately tissues with simultaneous
haemostasis on small vessels, represents one of the most interesting
expressions of modern technology applied to surgery.
The use of Laser in surgery dates back to 25 years ago. Its medical
applications, however, are a little more recent.
The word Laser comes from "Light Amplification by Stimulated Emission
It • is known that any material, which has been stimulated, emits
energy of excitation through the so called spontaneous Energy. This
means irradiation of "quanta" of electro-magnetic energy untidily in
space and time (so called "incoherent Emission").
A Laser source, conversely, emits "coherent" electro-magnetic
radiations (so called "stimulated Emission") , whose characteristics consist in: monochromaticity,directional ity, coherence and brilliance.