There was a recent paper (which I put out on the Twitter feed) in which laser was employed post op to reduce the scarring effect (Park, Y. J., et al. (2016). "Prevention of Thyroidectomy Scars in Asian Adults With Low-Level Light Therapy." Dermatol Surg 42(4): 526-534) which some beneficial effects.
There was an interesting review (Eilers, R. E., Jr., et al. (2016). "A Combination Approach to Surgical Scars." Dermatol Surg 42 Suppl 2: S150-156.) which considers several treatments, including laser based options
I have just checked the database and I have over 800 papers which in some way or another link the use of laser based therapies and their effect on scar / scar tissue. A lot of these are based on cell (in vitro) or animal studies and may not be immediately transferrable to the clinical setting. Lastly, this paper by Vranova et al (Vranova, J., et al. (2015). "Comparison of quality of facial scars after single low-level laser therapy and combined low-level with high-level (PDL 595 nm) laser therapy." Dermatol Ther 28(4): 201-209) might add some useful insight?