Vacuum Materials can be loaded additionally to common materials and will share the same abbreviations. If a Vacuum material is available for the same abbreviation, it will be used instead of a common material in all calculations that are related to vacuum environment:

• OptiMonitor,
• BBM, WDM and monochromatic simulators,
• pre-production estimation of errors,
• strategy generators (monochromatic monitoring).

Spectral characteristics of the design with normal and vacuum materials are different. Calculation of expected transmittance in vacuum can be important, for example, in the case of monochromatic or BBM control.  Example: transmittance of 43-layer quarter wave stack in vacuum is shifted to the shorter wavelengths.