Abstract: A diode laser beam collimator is disclosed which is adapted to polarize and correct the characteristic oval shape of a diode laser beam to a circular shape. The preferred embodiment comprises a prism whose apex angle is selected in accordance with the beam intensity distribution to be corrected. A multilayer dielectric coating on one face of the prism polarizes the beam. The coating comprises alternating layers of low and high refraction index material, whose refractive indices are cooperatively selected with that of the prism material and apex angle.