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Transformation of elliptical beams by holographic diffractive optics recorded onto spherical substrates

机译：椭圆形光束通过全息衍射光学器件记录在球形基底上的变换

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摘要

Elliptical outgoing beam is the main drawback of edge-emitting diode lasers, and for majority of their applications the elliptical beam needs to be transformed into another cross-sectional shape. Usually, a collimated circular beam with appropriate diameter is requested. Such a beam can be obtained in different ways, and this contribution deals with one of them - usage of off-axis holographic diffractive optics. Compensation for beam ellipticity from 1:2 for near infrared to 1:4 for visible spectra of the diode laser beam can be realized by holographic diffractive singlets recorded onto spherical substrate. Singlets employing for these ellipticities have to work in a strong off-axis mode with angles of diffraction reaching 75 deg. Theoretical analysis is presented and experimental results are given for reflection mode of operation.
机译：椭圆输出光束是边缘发射二极管激光器的主要缺点，在大多数应用中，椭圆光束需要转换为另一种横截面形状。通常，需要具有适当直径的准直圆形光束。可以以不同的方式获得这种光束，而这种贡献涉及其中之一-离轴全息衍射光学器件的使用。可以通过将全息衍射单线态记录到球形基板上来实现从近红外的1：2到二极管激光束的可见光谱的1：4的光束椭圆率补偿。用于这些椭圆率的单线态必须在强离轴模式下工作，衍射角达到75度。给出了理论分析，并给出了反射操作模式的实验结果。

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