Patent ID: 11965798
Assignee: APPLIED MATERIALS, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The endpoint detection system of claim 1, wherein the achromatic lens of the collimator assembly is further configured to:
responsive to receiving a second light beam of the incident light from the second emitting optical fiber, directing a third plurality of spectral components of the second light beam to a third portion of a substrate surface and a fourth plurality of spectral components of the second light beam to a fourth portion of the substrate surface, wherein the third portion is substantially the same as the fourth portion;
collect a third plurality of reflected spectral components of light and a fourth plurality of reflected spectral components of light from the substrate surface, the third plurality of reflected spectral components of light produced by the third plurality of spectral components directed onto the third portion of the substrate surface and the fourth plurality of reflected spectral components of light produced by the fourth plurality of spectral components directed onto the fourth portion of the substrate surface; and
transmit the third plurality of reflected spectral components and the fourth plurality of reflected spectral components to the second receiving optical fiber of the optical bundle, and
wherein the processing device is further configured to determine the reflectance of the substrate surface based on the third plurality of reflected spectral components and the fourth plurality of reflected spectral components.