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1、How to Model a Beam Splitter in Sequential Zemax Summary: This article explains: How to create a Beam Splitter Cube in sequential Zemax using mutiple configurations How to simulaneously trace transmitted and reflected rays in the layout and analysis/calculation windows How to calculate the total pow
2、er in both transmitted and reflected beams, accounting for polarization effects and thin-film coatings How to Model a Beam Splitter in Sequential Zemax (/support/knowledgebase/How-to-Model-a-Beam-Splitter-in- Sequential-Zemax) The article is accompanied by a ZIP archive containing the sample file. T
3、his can be downloaded from the final page of the article. Authored By: Nam-Hyong Kim Published On: September 23, 2005 Authored By: Published On: Sample File: Article Attachments (/support/knowledgebase/knowledgebase-attachments/how-to-model-a- beam-splitter-in-sequential-zemax/rotating.aspx) Applies
4、 to: 3D Geometries Article: Introduction Beam splitters can be modeled either in sequential or non-sequential raytracing modes of Zemax. In non-sequential mode, rays can split into refracted and reflected rays at a refractive surface. This is the core benefit of non-sequential mode: rays can split a
5、t the surface of an object into reflected and transmitted components. Sequential rays either refract at refractive surfaces or reflect at mirror surfaces, The multi- configuration capability of Zemax can be used to model both refracted and reflected ray paths in sequential mode. We will construct th
6、e system shown in the following layout to demonstrate how to model a beam splitter in sequential mode. The system above has a polarization-independent 50/50 beam splitter cube. The cube is made out of MgF coated N-BK7 glass. The 50/50 coating is ideal, being independent of polarization, incident ang
7、le and wavelength. The reflected rays, shown in green, reflect from the bottom mirror before reaching the top image surface. We will calculate the correct intensities at both image surfaces, accounting for N-BK7 bulk absorption, Fresnel losses from thin-film coated surfaces, and 50/50 splitting from
8、 ideal coatings. Before getting started with the example, you should know how to specify system and surface properties in Zemax. If not, please refer to the following articles, Designing A Singlet in Zemax (/support/knowledgebase/How-To-Design-a-Singlet-Lens) and How to Tilt and Decenter a Sequentia
9、l Optical Component (/support/knowledgebase/How-to-Tilt-and-Decenter-a- Sequential-Optical-Comp). Note that Zemax-EE can model coated surfaces in detail, including metallic and multi-layer dielectric coatings. In this example, we will concentrate on setting up the geometry, and we will restrict ours
10、elves to simple coatings. Example part A Set the following system parameters System unit to mm (System General Units) Wavelength to 550um (System Wavelengths) Set one field with values X=0 and Y=0 (System Fields) Set system aperture as Entrance Pupil Diameter of 15mm (System General Aperture) Enter
11、surfaces in the Lens Data Editor as shown below 2 Enter surfaces in the Lens Data Editor as shown below. User the Tilt/Decenter Elements tool, under Tools Coordinates Tilt/Decenter Elements, to tilt the surface #3 by -45 degrees. Open the 3D layout with 5 rays in the Y axis only. Example part B The
12、system aperture in sequential Zemax is circular and all surfaces have circular apertures by default. To make the beam splitter shape cubic, place a 10 X 10 rectangular apertures on surfaces 2 and 6 and 10 X root 2)*10 aperture on surface 4. Set the following apertures on surfaces 2 and 6 in the surf
13、ace properties window. Set the following aperture on surface 4 Update the 3D layout To remove the vignetted marginal rays from the layout, check “Delete Vignetted” box in the 3D layout settings Update the Layout Place the ideal 50/50 coating “I.50” on surface 4, and “AR“ coating on surfaces 2 and 6.
14、 The I.50 is an ideal 50% transmission coating and the AR is a quarter-wave thick MgF anti- reflection coating. Example part C We now have the straight (refracted) path of the beam splitter modeled. You can specify any amount of transmission by defining additional ideal coatings in the coating file.
15、 You can also create a non-ideal coating either by specifying coating layer thicknesses and material type or the transmission properties of the coating as a function of wavelength and incident angle. For more detailed information about how to define coatings in Zemax, please refer to chapter 20, sec
16、tion “defining coatings in Zemax” of our latest manual. The effect of thin-film coating can only be accounted for when considering the polarization 2 The effect of thin-film coating can only be accounted for when considering the polarization effects in the calculation or analysis, even if the coating is ideal. The total transmission at the image plane can be evaluated by any polarization-enabled analyses/calculations in Zemax. We will use the Polarization Ray Trace to calculate the total chie
