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Alexandrite laser and other apparatus used in hair removal. Practical comparison. Part III / Diode laser hair removal

Alexandrite laser and other apparatus used in hair removal. Practical comparison. Part III / Diode laser hair removal

01.01.2013


3. Diode laser hair removal.


Until relatively recently, diode lasers was not at all suitable for laser hair removal.

Just do not had technological level.

For this reason alone we can say that beauty salons that claim the "gold standard "for hair removal with respect to a new technique in hair removal - diode laser hair removal - at least not correctly received and unprofessionally toward their clients the same...


Read more...



For reference, laser hair removal with alexandrite laser is well-proven in the removal of unwanted hair since 1996 (now 15 years old!), and the equipment used by this method improves with each year, making the procedure more comfortable and effective.


Recall that the wavelength diode laser is 810 nm and the alexandrite laser wavelength is 755 nm.

The increase in wavelength leads to an increase in energy absorption in tissues surrounding the hair and reduce the absorption energy of the pigment melanin in skin and hair (see schedule of absorption).


Schedule of hemoglobin absorption (1) and melanin (3):


But even without taking into account the fact that the increase in wavelength leads to an increase in energy absorption surrounding tissues of the hair look at the main disadvantage of diode lasers in laser hair removal in present.

At the present stage the development of this technique is the low peak power.

Peak power lead! manufacturer of diode lasers is 500 watts.

The diode laser in fact it is more powerful, but it cannot be compared with the capacity of solid state of Alexandrite laser for hair removal, which develops 2000 watts, producing 40 J for 20 ms!


A natural question arises - why is such power of alexandrite laser needed?

The answer is to most effectively heat the hair follicle germ band before his injury (and as a consequence - no further growth) without concomitant damage to surrounding skin.


In laser medicine, there is such an important concept, as the thermal relaxation of tissue (TRT), which is the time at which target-tissue (in this case, the hair follicle) gives off heat into the surrounding tissue (in this case it is skin).

For the hair follicle, this time is from 10 to 35 ms (depending on skin photo type, hair color and thickness).

If the pulse duration will be longer this time, a significant portion of the pulse energy will dissipate in the surrounding tissues, causing unnecessary heat.


The energy of the light beam = Power * Pulse


In other words - the shorter the duration of pulse, the lower its energy.

According to the formula, if the laser power is insufficient to give the necessary energy is possible only with very long pulses, much longer than the thermal relaxation time of the follicle as a result and cause overheating of the surrounding tissues!

That is what often happens when a diode laser hair removal in the form of very noticeable! soreness procedure.


Unlike diode lasers, high power of Alexandrite laser system for laser hair removal allow depending on the type of skin and hair (if necessary) to establish individual minimum pulse duration is not losing energy, which completely eliminates the risk of overheating the surrounding tissue and thus burns.


To be continued ...


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