We describe an alternative to fiber-gratings for converting higher-order {\mathrm{L}\mathrm{P}}_{0m}(m>1) fiber modes into a nearly fundamental Gaussian shape at the output of a fiber. This schematic enables the use of light propagation in higher-order modes of a fiber, a fiber-platform that has recently shown great promise for achieving very large mode areas needed for future high-power lasers and amplifiers. The conversion will be done by using a binary phase plate in the near field of the fiber, which emits the {\mathrm{L}\mathrm{P}}_{0m} mode. Since the binary phase plate alone cannot increase the quality factor M^2 of the laser beam because of some broad sidebands, a filtering of the sidebands is done in the Fourier plane of a telescope. Of course, this will cost some of the total light power, but on the other side the M^2 factor can be reduced to nearly the ideal value near 1.0, and it is shown that \sim 76\% of the total light power can be conserved for all investigated modes (2\le m\le 8) . A tolerance analysis for the phase plate and its adjustment is made, and different optical imaging systems to form a magnified image of the fiber mode on the phase plate are discussed in order to have more tolerance for the adjustment of the phase plate.

© 2007 Optical Society of America

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