RP Photonics logo
RP Photonics
Modeling & Design Software
Technical consulting services on lasers, nonlinear optics, fiber optics etc.
Profit from the knowledge and experience of a top expert!
Powerful simulation and design software.
Make computer models in order to get a comprehensive understanding of your devices!
Success comes from understanding – be it in science or in industrial development.
The famous Encyclopedia of Laser Physics and Technology – available online for free!
The ideal place for finding suppliers for many photonics products.
Advertisers: Make sure to have your products displayed here!
powerful tools for efficient laser development and laser science
This page gives you an overview on our software products.
RP Fiber Calculator is a convenient tool for calculations on optical fibers.
RP Fiber Power is an extremely flexible tool for designing and optimizing fiber devices.
RP Resonator is a particularly flexible tool for laser resonator design.
RP ProPulse can simulate the pulse evolution e.g. in mode-locked lasers and sync-pumped OPOs.
RP Coating is a particularly flexible design tool for dielectric multilayer systems.
RP Q-switch can simulate the power evolution in Q-switched lasers.
Most of our software products support a powerful script language, which gives you an extraordinary degree of flexibility.
Here you learn about software license conditions, updates and upgrades, etc.
Competent technical support is a key quality associated with software from RP Photonics.
RP Photonics has distributors in various countries.
The RP Photonics Software News keep you updated on our developments and give the users additional interesting hints.
Here you can make inquiries e.g. concerning technical details, prices and quotations.
en | de

RP Coating – Advanced Software for
Designing Optical Multilayer Structures

A Flexible Tool for Developing Laser Mirrors, Dispersive Mirrors, Filters and Polarizers

RP Coating V3 is a particularly flexible and powerful thin-film software tool for developing all kinds of optical multilayer structures. It is not limited to standard devices as conceived by the developer, but also gives the developer the power to analyze and optimize anything new. At the same time, it is extremely convenient for industry people who often need to quickly adapt designs to new parameter values: designs can be fully parameterized such that the whole structure can be controlled with a few parameters instead of a long list of layer thickness values.

RP Coating

The software has been developed by Dr. RĂ¼diger Paschotta. Early versions have already been used in his scientific research, particularly in the context of SESAMs and mode-locked VECSELs. Since 10/2012, user licenses are available from RP Photonics.

Design Anything You Need!

RP Coating can be used, for example, to analyze and optimize the following kinds of thin-film devices:

  • dielectric mirrors (laser mirrors), including chirped mirrors (e.g. most advanced double-chirped mirror designs with extremely high bandwidth) or other kinds of dispersive mirrors (e.g. GTIs)
  • anti-reflection coatings, including advanced multilayer structures, found e.g. with a Monte-Carlo technique
  • optical filters (short-pass and long-pass edge filters, band-pass filters, monolithic and air-spaced etalons, volume Bragg gratings, rugate filters and other types of interference filters)
  • thin-film polarizers (plate polarizers, polarizing cubes)
  • semiconductor structures, such as SESAMs, including saturable absorption characteristics, chromatic dispersion, etc., and also VECSEL gain structures

You may also define any other multilayer structures, for whatever purpose.

Main Features

  • RP Coating offers different methods to define a thin-film multilayer structure. Apart from simply listing all layer materials and thickness values one by one, it is also possible to specify a structure with mathematical expressions (e.g. to calculate a chirped mirror structure according to a few given parameters). This allows you to fully parameterize your designs: you can control the whole design with a couple of parameters instead of a long list of layer thickness values. Another option is to read a structure from a file – with great flexibility concerning binary and text file formats.
  • The program can calculate a large number of relevant properties of a multilayer structure, including its reflection and transmission amplitudes and phases (with a variable angle of incidence), chromatic dispersion, field distribution inside the structure, etc.
  • There are material data for a substantial selection of materials. It is also no problem to add data for any additional materials, using essentially any kind of definition: tabulated data (refractive index versus wavelength), a Sellmeier formula or whatever may be more appropriate.
  • The software allows for various kinds of optimizations.

A figure of merit can be freely defined as a mathematical expression which may refer to arbitrary combinations of different properties, including fabrication error tolerances. (Note that competing products normally only allow you to modify parameters of a fixed type of figure of merit.) The optimization can be a local one or use a Monte-Carlo algorithm. It can affect all layer thickness values separately, or only some parameters which indirectly determine a layer structure. - By fitting to experimental data, deviations from specified thickness values or material data can be calculated. - All results can be shown graphically. The user can essentially define any kind of plot or color diagram, and not only select from a set of predefined diagrams. - Also, results can be shown in text form: written into a special area in the software window, written into graphical diagrams or to text files. There is full flexibility concerning text or binary file formats. For example, you can read files from a spectrometer and write files for controlling your coating machine.

You will hardly find a competing software which is similarly flexible and suitable for such a wide range of applications.

More than 15 demo files are delivered the software, treating simple mirror structures as well as sophisticated optimizations.