We share a method of simulating Direct interference Laser Patterning in Zemax OpticStudio, including a Top Hat envelope if desired.
DLIP system optical modelling using ZEMAX OpticStudio software
Alexander Brodsky and Natan Kaplan
Keywords: optical design, ZEMAX Laser Surface Texturing, Direct Laser Interference Patterning
In the last few years there has been a growing interest in utilizing Direct Laser Interference Patterning (DLIP) for surface structuring with high-power short pulse lasers. As Holo/Or is a major supplier of the high-power diffractive optical elements (DOEs) used in many DLIP systems, we felt the need to provide system integration support for our customers in this field.
As a part of our unwavering commitment to customer support, we have shared a Zemax OpticStudio design file, developed in-house, of the DLIP optical system.
Our model allows one to simulate nominal performance, as well as tolerances. It can easily be customized for any optical parameters; such as wavelength, beam size, splitting angles, number of orders, focal length, etc.
We hope that this tutorial will help professionals developing DLIP systems to better model their system and explore technical issues, including integration of our DOEs into their system.
You are welcome to download the source file from the link placed at the bottom of the document.
1. Detailed description of the simulation model
The file includes a four-beam interference system with a Top Hat beam shaper as described in the reference . In figure 1.a. the system layout from the reference. is shown and in figure 1.b. a 3D layout of a similar system simulated using Zemax OpticStudio.
Simulation parameters are:
- Wavelength: 1053nm
- Input beam: 4mm
- An Angular Diffractive square Top Hat beam shaper with an image size of 1x1mRad
- A Diffractive Beam Splitter 2×2 beams with period 4 um
- A collimating prism with four zones, placed 55 mm after the beam splitter.
- Ideal focusing lens with EFL 100mm
The file was prepared in sequential mode, which has certain advantages in analysis methods for coherent systems.
In figure 2. we show the Lens Data window. In line 2 we placed a Top Hat beam shaper BlackBox file, followed by two orthogonal Diffraction Grating surfaces that model a 2×2 beams beam splitter. More details about modeling Diffractive Beam Splitters can be found in our tutorial
Surfaces 10 and 11 construct a single prism placed with a coordinate break to collimate the split beams. Coordinate break with Z axis rotation and shift for X and Y Axis so that the prism always collimates the rays coming out of the diffraction grating.
Each of the four split beams has an individual configuration that can be seen in the Multiconfiguration editor in figure 3. Diffractive order numbers, Z rotation angle and X or Y shift of prism of Coordinate Break are defined as the parameters.
Huygens PSF was chosen for analysis, as it is a more universal method. To see the interference, choose in the properties of the Huygens PSF the option to show all configurations together.
In figure 4 (left) we show the real intensity results from the reference article vs our model of a similar system.
Holo/Or has developed an effective simulation tool for a DLIP system. You are welcome to contact us for more details, help in design, and an offer for the various DOE components in the DLIP setup you design.
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