We have been using a continuous dye laser (coherent medical) for more than two years. The wavelength is 585 nm, the power 1.8 W and the fluence 16 - 18 J/cm2. We have treated 364 patients with port-wine stains and 15 children with ulcerated hemangiomas. The results were analyzed using a computer program developed by a team in Lille. The most frequent color was pale pink, followed by deep pink, red and purple. The mean number of laser sessions was 2.3.
Yves de Prost,
"Argon-pumped tunable dye laser for port-wine stains", Proc. SPIE 2327, Medical Applications of Lasers II, (23 December 1994); doi: 10.1117/12.197557; https://doi.org/10.1117/12.197557