Laser Hair Removal System

This process is continually proceeding avalanche-like and thus the intensity of the light beam is continuously increasing. At one end of the resonator, a partially reflective mirror is used. It outputs the useable laser beam then.


Interaction of light and tissue

Light energy can be used for selectively damaging specific constituents of skin or tissue.

The fundamentals of the interaction of light with tissue include:
(1) reflection, scattering and absorption of light by/in the tissue,
(2) effect of heat energy produced by absorption and
(3) response of tissue to the damage.

The wavelength, pulse duration (exposure time) and fluence (energy density) of the laser beam are the decisive parameters for the biological response. The various constituents of tissue (water, hemoglobin, melanin and other pigments) absorb light of different wavelengths more or less strongly. Therefore, the selection of the wavelength has an effect on the selectivity of the laser treatment and thus the probability of unwanted side effects.

The directed, parallel laser beam is generated by a resonator. In its simplest form, the resonator consists of two parallel mirrors with the laser medium in between. If in the medium many light waves are generated by emission, the mirrors will always reflect those waves back into the medium that are perpendicularly incident on them. Passing through the medium the reflected waves again will hit excited atoms and stimulate them in turn to emit light of the same wavelength.

In the laser, emission is triggered artificially by letting a light wave collide with an atom of the same energy. This will do to excite the atom to emit an own wave of the same frequency. That's why this process is referred to as stimulated emission.

The way, how energy is pumped into the laser thus "charging it up", depends on the active medium used. The customary methods are based on the excitation by high-intensity light, the so-called "optical pumping" (solid-state lasers), on the excitation by an electrical gas discharge (gas lasers), or on direct electrical pumping (diode lasers).

The generation of laser beams is based on the condition that there are more excited atoms in the active medium than atoms in low energy levels; this kind of energy distribution is called inversion.

In general, a light wave is generated when an atom "drops back" from an excited state of a high energy level to a lower-energy state. The difference between the two energy levels corresponds to the energy of the emitted wave.

The medium can be a gas, a liquid or a solid state laser.

Inside the laser, energy is pumped into an "active medium". Subsequently, the medium is stimulated to release the stored energy in form of light. This light is then bundled into a beam by means of mirrors in a so-called resonator.

Since the invention of the laser in 1960, it has established itself in all branches of science and technology. Today, modern med

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