We present a new, compact, and practical optical mode converter that efficiently transforms a high-order Hermite–Gaussian (HG) laser beam into a nearly Gaussian beam. The mode converter is based on coherently adding different transverse parts of the high-order mode beam by use of a single planar interferometric element. The method, configuration, and experimental results obtained with a pulsed Nd:YAG HG TEM<sub>10</sub> laser beam are presented. The results reveal that the efficiency of conversion of a HG beam to a nearly Gaussian beam can be as high as 90%.
© 2003 Optical Society of America
A. A. Ishaaya, G. Machavariani, N. Davidson, A. A. Friesem, and E. Hasman, "Conversion of a high-order mode beam into a nearly Gaussian beam by use of a single interferometric element," Opt. Lett. 28, 504-506 (2003)