由激光发射出的光线都是同位的.All rays leaving the laster are in phase.许多材料在得到适当的能量(比如在受到加热)时, 都会发射出光.Many material, if given the proper energy, such as by heating , give off light.OPTIMA感应器持续发射出一束不可见光.A continuous, invisible light bea...