Thank you for your question. While I am not totally familiar with laser surgeries I do know a little about lasers. In a laser, light is concentrated and focused into a single beam of high intensity light which travels pretty much in one direction. Depending on the wavelength of light and the intensity a laser can be used for many different things. For example, red wavelengths of light can be used to penetrate through the skin and have effect on other cells or tissues. Stronger intensities of higher energy light may be able to cut or seal ('weld'?) the skin.

In my research, we sometimes use a tiny probe in an atomic force microscope to pull on molecules from muscle or bone. We often find that we can attach the molecules to the microscope slide and the microscope's probe tight enough to pull with high force simply by mashing the probe tip against the molecules on the slide.

It seems to be a new procedure, where the laser 'melts' the proteins in muscle and they cool and solidify; and other proteins are often added to make a stronger weld. This was from a 1998 online article.