aberration: Deviation from what is normal; in optics, defects of a lens system that cause its image to deviate from normal.

absorption: Transformation of radiant energy to a different form of energy by interaction with matter. Or, the loss of light as it passes through a material.

accessible emission limit (AeL): The maximum accessible emission level permitted within a particular class.

accessible optical radiation: Optical radiation to which the human eye or skin may be exposed for the condition (operation, maintenance, or service) specified.

active medium: A medium in which stimulated emission will take place at a given wavelength.

alpha max (αmax): The angular limit beyond which extended source MPEs (maximum permissible exposures) ...

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