There are many different options to treat the sun spots, as well as many different lasers. I use both The IPL (intense pulse light) as well as a fractionated non-ablative erbium laser. But are used with great results according to the skin type, area and type of age spots.
It really depends on the doctor and his experience with treating the sun spots!!! The settings are important to get good results. It may take a few treatments at times or disappear after the first session!