Nd Yag laser is a non-ablative laser which means that there is no break in skin tissue continuity during the treatment. It is designed to target pigment cells. These specific wavelengths are absorbed preferentially by pigments and the resultant heat will causes generation and propagation of waves that causes damage to the cells containing pigment. These damaged cells will be cleared from the site resulting in lightening of the pigmented site.
This machine comes in 3 wavelengths, 1064nm, 532nm and 1320nm. Besides pigmentation removal, it can be used as a skin rejuvenation tool as well.