Pupeza Ioachim, Fill Ernst E, Krausz Ferenc
Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany.
Opt Express. 2011 Jun 20;19(13):12108-18. doi: 10.1364/OE.19.012108.
We present a low-loss VIS/IR-XUV beam splitter, suitable for high-power operation. The spatial separation of the VIS/IR and XUV components of a beam is achieved by the wedged top layer of a dielectric multilayer structure, onto which the beam is impinging under Brewster's angle (for VIS/IR). With a fused silica wedge with an angle of 0.5° we achieve a separation angle of 2.2° and an IR reflectivity of 0.9995. Typical XUV reflectivities amount to 0.1-0.2. The novel element is mechanically robust, exhibiting two major advantages over free-standing Brewster plates: (i) a significant improvement of heat conduction and (ii) easier handling, in particular for high-optical-quality fabrication. The beam splitter could be used as an output coupler for intracavity-generated XUV radiation, promising a boost of the power regime of current MHz-HHG experiments. It is also suited for single-pass experiments and as a beam combiner for pump-probe experiments.
我们展示了一种适用于高功率运行的低损耗可见/红外-极紫外光束分离器。光束中可见/红外和极紫外成分的空间分离是通过介电多层结构的楔形顶层实现的，光束以布儒斯特角（对于可见/红外）入射到该顶层上。使用角度为0.5°的熔融石英楔形物，我们实现了2.2°的分离角和0.9995的红外反射率。典型的极紫外反射率为0.1 - 0.2。这种新型元件机械性能坚固，与独立的布儒斯特板相比具有两个主要优点：（i）显著改善了热传导，（ii）更易于操作，特别是对于高光学质量的制造。该光束分离器可用作腔内产生的极紫外辐射的输出耦合器，有望提升当前兆赫兹高次谐波产生实验的功率范围。它也适用于单程实验以及作为泵浦-探测实验的光束组合器。
