Eckstein Hans-Christoph, Zeitner Uwe Detlef
Fraunhofer Institute for Applied Optics and Precision Engineering Albert Einstein Strasse 7, D-07745 Jena, Germany.
Opt Express. 2009 Sep 28;17(20):17384-90. doi: 10.1364/OE.17.017384.
Unstable resonators show an intense discrimination of undesired higher order modes but a high beam quality cannot be obtained with conventional resonators composed of spherical mirrors. In the present paper we demonstrate the possibility to tailor the fundamental mode by inserting diffractive elements into the resonator to generate a desirable output beam profile even for unstable resonators. We show a concept to design such surface structured elements for customizing the amplitude shape of the outcoupled beam. Further we demonstrate the first experimental realization of an unstable diffractive resonator with a Gaussian shaped amplitude profile of the laser beam for a vertical external cavity surface emitting laser (VECSEL).
非稳腔对不需要的高阶模具有强烈的抑制作用，但由球面镜组成的传统腔无法获得高光束质量。在本文中，我们证明了通过在腔内插入衍射元件来调整基模的可能性，即使对于非稳腔也能产生所需的输出光束轮廓。我们展示了一种设计这种表面结构元件的概念，用于定制输出耦合光束的振幅形状。此外，我们还展示了垂直外腔面发射激光器（VECSEL）的非稳衍射腔的首次实验实现，其激光束具有高斯型振幅分布。
