Infertility treatments, hair and tattoo removal have laser treatment in common. However, for each, the type of laser and the light wavelength capacity differs according to the type and duration of treatment.

A micromanipulation technique called laser photoablation is used to assist hatching of the embryo in infertility treatment when the  embryo is implanted into the uterus. Sometimes the zona pellicuda protective coating prevents the embryo from hatching when it should, so a 1.48 micron infrared diode laser may be used to make a tiny gap in this outer lining to help the embryo develop to the blastocyst stage. A computer controls the laser in energy output, pulse duration, and gap size.

Similarly, diode lasers can be used for laser hair removal where the controlled light energy is aimed to the centre of the hair follicle tissue, destroying it, so that it does not grow back. In contrast to laser use for infertility treatment, the diode laser used in hair removal is different in wavelength, spot size, fluence, pulse width and 1 Hz repetition rate of the diode laser.

However, Q-switched lasers are considered more effective for tattoo removal, except that the laser light is aimed at the pigment colour of the tattoo ink to disintegrate it for absorption into the body, and then natural expulsion. Current laser models include Nd: YAG, Alexandrite, and Ruby. Each of these lasers may work better for certain pigment colours.

hair · tattoo

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