US 11,422,086 B2 · Efficient reading of birefringent data

Abstract

One example provides a system for reading birefringent data. The system comprises one or more light sources, a first polarization state generator positioned to generate first polarized light from light of a first wavelength band output by the one or more light sources, a second polarization state generator positioned to generate second polarized light from light of a second wavelength band output by the one or light sources, an image sensor configured to acquire an image of the sample region via the first polarized light and the second polarized light, a polarization state analyzer disposed between the sample region and the image sensor, a first bandpass filter configured to pass light of the first wavelength band onto the image sensor, and a second bandpass filter configured to pass light of the second wavelength band onto the image sensor.

Claims13

Dependent claims

A system for reading birefringent data, the system comprising:

one or more light sources;
a first polarization state generator positioned to generate first polarized light from light of a first wavelength band output by the one or more light sources;
a second polarization state generator positioned to generate second polarized light from light of a second wavelength band output by the one or light sources;
an image sensor configured to acquire an image of a sample region through which the first polarized light and the second polarized light passes;
a polarization state analyzer disposed optically between the sample region and the image sensor;
a first bandpass filter disposed optically between the polarization state analyzer and the image sensor, the first bandpass filter configured to pass light of the first wavelength band;
and
a second bandpass filter disposed optically between the polarization state analyzer and the image sensor, the second bandpass filter configured to pass light of the second wavelength band.

5 more elements

A method for performing birefringence measurements, the method comprising:

generating first polarized light from light of a first wavelength band output by one or more light sources, the first polarized light comprising a first polarization state;
generating second polarized light from light of a second wavelength band output by the one or more light sources, the second wavelength band being different than the first wavelength band, and the second polarized light comprising a second polarization state that is different from the first polarization state;
passing the first polarized light and the second polarized light through a voxel of a storage medium, thereby changing the first polarization state to a first modified polarization state and changing the second polarization state to a second modified polarization state;
passing the first polarized light and the second polarized light through a polarization state analyzer after passing the first polarized light and the second polarized light through the voxel of the storage medium;
passing the first polarized light through a first bandpass filter and onto a first region of an image sensor;
and
passing the second polarized light through a second bandpass filter and onto a second region of the image sensor.

4 more elements

Dependencies are inferred from the claim text.

Efficient reading of birefringent data

Life of this patent

Efficient reading of birefringent data

Life of this patent

Abstract

Claims13