A diffractive laser cavity mirror is described that can customize the amplitude
and phase of a laser mode. The design of this diffractive element is shown for a
square, flat-topped fundamental mode. The laser cavity has a theoretical
fundamental mode loss of only 0.08% and a second-order mode loss of
48.2%, resulting in high modal discrimination. The fabricated mirror is
tested in a Nd:YAG laser system. The resulting square flat-topped mode has an
rms variation of 1.5% over the two-dimensional flat-topped region and a
large discrimination against higher-order modes.
© 1994 Optical Society of America
Equations on this page are rendered with MathJax. Learn more.