Integrated coefficient of thermal expansion (CTE)-flex coupler

A device, comprising:

• a package body having a first opening;
• a coupler arranged in the first opening and having a second opening,
• wherein the coupler is affixed to the package body by a first epoxy joint at an interface of the package body and the coupler, and
• wherein the coupler comprises a flexible element associated with providing stress reduction;
• and
• a window arranged in the second opening,
• wherein the window is affixed to the coupler by a second epoxy joint at an interface of the coupler and the window, and
• wherein a coefficient of thermal expansion (CTE) of a material of the coupler is between a CTE of a material of the package body and a CTE of a material of the window.

A package, comprising:

• a package body;
• a coupler in an opening of the package body, the coupler and the opening of the package bodying have a round geometry;
• wherein a structure of the coupler includes a flexible element, and
• wherein a material of the coupler provides a coefficient of thermal expansion (CTE) step between a material of the package body and a material of a window;
• the window in an opening of the coupler;
• a first epoxy joint at an interface of the package body and the coupler at the opening of the package body;
• and
• a second epoxy joint at an interface of the coupler and the window at the opening of the coupler.