Method for Producing a Holographic Optical Element

A method for producing a holographic optical element from a photopolymeric recording medium, comprising:

• providing a substantially flat recording stack comprising at least one recording element that includes a photopolymeric material laminated on at least one supporting element,
• irradiating at least a part of the substantially flat recording stack with at least one recording beam in an irradiating step resulting in the recording stack bending,
• determining a bending deviation threshold for the recording stack, the bending deviation threshold chosen or determined through experimentation or calculation;
• and
• adjusting at least one first process parameter such that a maximum bending deviation ξmax of the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behavior of the recording stack during the irradiating step, and
• wherein the first process parameter is a ratio Rdim of lateral dimensions of the recording stack to a thickness of the recording stack, a coefficient of thermal expansion (CTE) of the recording stack, a fill factor of a recording element area versus a supporting element area, exposure time texp at a fixed recording dosage E or both the supporting element area and the exposure time texp.