LightSheer is not a good laser for you because settings that would be high enough to actually kill the hair will burn your skin. It’s a laser for light skin and dark hair.
Yag lasers are made by various manufacturers. Some that I know off the top of my head are Coolglide by Cutera, GentleYag by Candela, Lyra… Check out the Cutera and Candela websites and run a provider search. Maybe there is something in your country.
Thinning of the hair is not bad, but if you’re paying that much money, you should be getting much better results, don’t you think? Plus, if hair got thinner now, there is no way to know if it will get more coarse later on again.
Here’s an explanation on how Yag lasers work:
"The long pulse Nd:YAG laser is the “newest” hair removal laser. Because it’s 1064nm infrared beam is poorly absorbed by skin and pigment, it may be safely used in all skin types, including tanned patients. Large spot sizes and fast repetition rates allow large areas to be treated quickly. Disadvantages include more discomfort during treatment and less effective clearance for fine and light hairs than the other hair removal lasers. "
“Shorter wavelength lasers such as the Ruby and Alexandrite are hightly absorbed by melanin, and can deliver more energy to ligher, finer hairs, but with more absorption in skin melanin and risk of blistering. Longer wavelength laser such as the Diode and Nd:YAG penetrate deeper into the skin, and are less well absorbed by melanin, and so can be safely used in darker skin types, but with much less effect on lighter, finer hair.”