Patent ID: 11874229
Assignee: ONTO INNOVATION INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method of Raman spectroscopy, comprising:
generating a first light beam having a first wavelength with a first excitation source;
generating a second light beam having a second wavelength with a second excitation source;
partially reflecting the first wavelength and transmitting the second wavelength with a first dichroic beam splitter to propagate the first light beam and the second light beam along a same optical axis that is incident on a sample,
receiving with the first dichroic beam splitter a first Raman response emitted from the sample in response to the first light beam, a second Raman response that is emitted from the sample in response to the second light beam, the first light beam reflected from the sample, and the second light beam reflected from the sample;
directing with the first dichroic beam splitter the first Raman response and the second Raman response together without the first light beam reflected from the sample towards at least one spectrometer;
receiving the first Raman response and the second Raman response that are emitted from the sample from the first dichroic beam splitter with the at least one spectrometer, wherein the at least one spectrometer comprises a first spectrometer and a second spectrometer, the method further comprising:
separating with a second dichroic beam splitter the first Raman response and the second Raman response;
directing with the second dichroic beam splitter the first Raman response towards the first spectrometer;
directing with the second dichroic beam splitter the second Raman response towards the second spectrometer;
spectrally measuring the first Raman response that is emitted from the sample in response to the first light beam with the first spectrometer; and
spectrally measuring the second Raman response that is emitted from the sample in response to the second light beam with the second spectrometer.