Method to measure light loss of optical films and optical substrates

A method of optical device metrology comprising:

• introducing a first type of light into a first optical device during a first time period, the first optical device comprising an optical substrate and an optical film disposed on the optical substrate, the first optical device including a first surface, a second surface, and one or more sides connecting the first surface with the second surface;
• measuring, during the first time period, a quantity of the first type of light transmitted from a plurality of locations on the first surface or the second surface during the first time period, wherein the measuring is performed by a detector coupled to a camera positioned to collect the light transmitted from the plurality of locations;
• and
• determining a magnitude between successive peaks and troughs in the measurements along the first surface or the second surface to determine a relative amount of optical loss due to scattering and a relative amount of optical loss due to absorption.

A method of optical device metrology comprising:

• a) introducing a first type of light into a first optical device during a first time period, the first optical device comprising an optical substrate and optical film, the first optical device including a first surface, a second surface, and one or more sides connecting the first surface with the second surface;
• b) measuring, during the first time period, a quantity of the first type of light transmitted from a plurality of locations on the first surface or the second surface during the first time period, wherein the measuring is performed by a detector configured to receive the light transmitted from the plurality of locations;
• c) determining a magnitude between successive peaks and troughs in the measurements along the first surface or the second surface to determine a relative amount of optical loss due to scattering and a relative amount of optical loss due to absorption;
• repeating operations a) b), and c) for a second optical device that includes one or more of a different optical substrate and a different optical film than the first optical device;
• and
• selecting the first optical device or the second optical device for a larger production run based on differences between the measurements.