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OptiLayer:  Your Partner in Design and Post-Production Characterization of Optical Coatings

 

Evolutionary Reverse Engineering Algorithm

New evolutionary post-production characterization algorithm significantly improves the search for the best fit in the case of multi-scan data. The new option is available in OptiRE through: 

Solve --> Random Errors

Solve --> Quasi-Random Errors

Solve --> Quasi-Random Inhomogeneities

Solve --> Random Errors (scientific mode)

Solve --> Quasi-Random Errors (scientific mode)

In comparison with the previous versions, there is a choice between two algorithms in "Method" field: Simple Refinement and Triangular algorithm. In the case of "Simple Refinement", discrepancy function \(DF\) is minimized with respect to all "Active" layer thicknesses:

\[ DF^2=\frac{1}{m}\sum\limits_{k=1}^m\frac 1L\sum\limits_{j=1}^L\left[\frac{T(d_1,...,d_m;\lambda_j)-\hat{T}^{(k)}(\lambda_j)}{\Delta T_j}\right]^2, \]

where \(m\) is the number of design layers, \(\{\lambda_j\}, \; j=1,...,L\) is the wavelength grid, \(\hat{T}^{(k)}(\lambda_j)\) transmittance scan recorded after the deposition of \(k-\)th layer, \(\Delta T_j\) are measurement tolerances.

Evol RE alg SEttings
Evol RE alg SEttings2

In the case of "Triangular algorithm", partial discrepancy functions \(DF(i)\) are minimized with respect to all "Active" layer thicknesses among \(d_1,...,d_i\):

\[ DF^2(i)=\frac{1}{i}\sum\limits_{k=1}^i\frac 1L\sum\limits_{j=1}^L\left[\frac{T(d_1,...,d_i;\lambda_j)-\hat{T}^{(k)}(\lambda_j)}{\Delta T_j}\right]^2,\]

where \(m\) is the number of design layers, \(\{\lambda_j\}, \; j=1,...,L\) is the wavelength grid, \(\hat{T}^{(k)}(\lambda_j)\) transmittance scan recorded after the deposition of \(k-\)th layer, \(\Delta T_j\) are measurement tolerances.

Important: At each \(i-\)step, starting approximations of actual layer thicknesses are taken from the result of the \((i-1)-\)step. This reduces the instability in determination of actual layer thicknesses significantly.

 

   

Easy to start

Icons 100x100 1OptiLayer provides user-friendly interface and a variety of examples allowing even a beginner to effectively start to design and characterize optical coatings.        Read more...

Docs / Support

Icons 100x100 2Comprehensive manual in PDF format and e-mail support help you at each step of your work with OptiLayer.

 

Advanced

Icons 100x100 3If you are already an experienced user, OptiLayer gives your almost unlimited opportunities in solving all problems arising in design-production chain. Visit our publications page and challenge page.

 

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