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This part of ISO 11151 specifies requirements for laser components used in the near ultra-violet, visible and near infrared spectral ranges, from wavelengths 190 nm to 2100 nm, and facilitates the supply of spare parts

• by specifying preferred dimensions and tolerances, thereby reducing the variety of types;
• by standardizing the specifications and removing barriers to trade;
• by establishing an agreed designation for item orders.

This part of ISO 11151 covers planar, plano-spherical and spherical substrates, lenses and optical components that are designed specifically as standardized optical components normally offered via catalogue from suppliers and intended for use with lasers.

This part of ISO 11151 includes component descriptions, materials employed, physical dimensions and manufacturing tolerances (including surface finish, figure and parallelism). Although most, but not all, of these components are coated (fully reflecting, partially reflecting or anti-reflecting) before incorporation into the laser system, this part of ISO 11151 does not include recommendations for the specification of coatings.