Patent ID: 11946809
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 9:
10. A polarization measuring device comprising:
a stage on which a measurement target is provided;
a light source assembly configured to emit incident light;
a first polarimeter configured to polarize the incident light;
a second polarimeter configured to polarize reflected light reflected from the measurement target that is irradiated by the incident light;
a filter assembly configured to remove noise from the reflected light; and
a detector configured to receive the reflected light and measure an intensity of the reflected light and a phase of the reflected light,
wherein the first polarimeter comprises a photoelastic modulator configured to change a phase of the incident light,
wherein the filter assembly comprises a lock-in amplifier configured to selectively acquire a signal of reflected light of a certain frequency,
wherein the detector is further configured to acquire a phase difference of frequencies of the reflected light,
wherein each of a polarization axis of the first polarimeter and a polarization axis of the second polarimeter changes based on the measurement target, and
wherein the detector is further configured to acquire differential values of a ratio of amplitudes of frequencies of the reflected light and the phase difference of frequencies of the reflected light in relation to time.