Experimental and numerical study demonstrates efficient transformation of fiber modes into near-ideal Gaussian beams using binary phase plates, indicating broadband capability and high beam quality.
We demonstrate conversion of a higher-order LP 0, m mode to a nearly perfect Gaussian beam using silica binary phase plates. The conversion efficiencies obtained are above 60% with corresponding beam propagation parameters of M 2 < 1.1 of the converted beams for all investigated higher order modes, indicating conversion to an almost perfectly Gaussian beam. We also provide a numerical analysis of the conversion scheme, including bandwidth, both with respect to the conversion efficiency and resulting M 2 . Lastly, we discuss the impact of parasitic modes on the conversion scheme.
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Hvidberg et al. (2026) studied this question.
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