Its not called lasers but it is known as Heat Vision.
Due to Photonucleic Effect Kryptonians are able to release large amounts of the solar energy stored in their cells as heat (Presumably, as infra-red light) via their eyes in focused beams.
In most depictions, Heat Vision has been shown as a solid red beam. However, in Smallville and Superman Returns, heat vision was pictured as beams of heat distortions in the
air-- that is, the beams themselves are invisible, but their intense
heat causes the air to ripple and shimmer.
In other works, "invisible" heat vision means that the beams are
relatively low power and is sometimes used by Superman in a discreet
manner as Clark Kent. In the later seasons of Smallville, the beams
become solid orange, implying that the appearance changed because
Clark has become more powerful as he ages. - superman.wikia.com