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Output Coupler

An output coupler is a special type of optic that is intimately related to out-coupled systems.

Within a resonator, any mirror (except the top mirror) can be made partially reflective by selecting menu Edit | Output Coupler or clicking the  Output Coupler button on the toolbar.

Out-coupled System

This creates a new system. The initial mode for the out-coupled system is taken from the resonant mode just before the output coupling mirror, and is then propagated through the Output Coupler optic.

The Output Coupler is linked to the mirror in the parent system. Properties such as face angle and radius of curvature are taken from the original mirror. The properties of the Output Coupler include only those that are necessary for transmission through the optic but not for reflection.

Refractive Index

Limit: > 1.

Specifies the refractive index of the output coupler material. This determines the refraction and focusing characteristics of the output coupling mirror.

Thickness

Limit: > 0.

Specifies the thickness of the output coupler. The actual distance traversed within the element may be larger than the optic thickness due to refraction. See the notes for refractive elements.