Advances in laser technology have enabled the development of this fibre laser which has been tuned to take advantage of a peak in the hemoglobin absorption spectrum at 980nm. (Fig 1) At this wavelength the absorption by hemoglobin is twice that at 810nm (diode) and 1064nm (typically Long Pulse NdYag). (Fig 2)
It also coincides with a small peak in the absorption by water a major constituent of blood, which will help to elevate the baseline temperature of the blood and to some extent the surrounding tissue.
Finally the absorption by melanin at 980nm is 3 times less than at 810nm.