Sector beams in different colors and with different angles of divergence are available when equipped with different color and divergent lenses.

配上不同的颜色玻璃和不同的发散透镜，可获得各种颜色、各种发散角的扇形光束。

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Gaussian beam propagation through a kind of parabolic divergent GRIN rod lenses is studied.

本文研究一类抛物型发散梯度折射率棒透镜中高斯光束的传播。

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