Floating Constants
A new big addition to OptiLayer design capabilities: supporting floating constants for all targets. It is possible to specify only constant offset, or more complicated offsets depending on frequency: \(C_1+C_2\cdot\omega\) or \(C_1+C_2\cdot\omega+C_3\cdot\omega^2\). These new options are important for designing of ultrafast coatings in the case when a constant/linear/parabolic GD/GDD are required. The option is useful also in general case, when, for example, it is necessary to design a coating with constant T/R in some spectral region, and the absolute value of this characteristic is not important. Example (right panel): target transmittance is to be flat in the spectral range in the visible spectral range; transmittance must be in the corridor from 60% to 90% and from 15% to 35% in the spectral ranges from 400 to 570 nm and from 630 to 800 nm, respectively. 

There are three types of floating constants:


Target specification: you should specify two pages for each desired spectral range. In the first page you should indicate a floating constant type:  In the second page you specify the allowed limits of the spectral characteristics using range targets: 