Binary phase plates are often suggested as a means for improving the far-field brightness of beams coming from antiphased laser arrays or waveguide lasers operating in higher-order modes. Somewhat surprisingly, however, binary phase plates actually cannot improve at all the second-moment-based beam quality factor M2 as usually defined for such beams. Even from a power-in-the-bucket viewpoint, their usefulness is debatable.
© 1993 Optical Society of America
Original Manuscript: December 17, 1992
Published: May 1, 1993
A. E. Siegman, "Binary phase plates cannot improve laser beam quality," Opt. Lett. 18, 675-677 (1993)