Optical coherence tomography system combining two wavelengths

1. An optical coherence tomography (OCT) system comprising:

a first light source configured to emit a first beam having a first wavelength;

a second light source configured to emit a second beam having a second wavelength;

an interferometer wherein the first beam and the second beam are configured to be directed into the interferometer, and further wherein the interferometer comprises:

a reference path, and

an interferometer sample path;

a first beam splitter configured to divide, from an output of the interferometer sample path:

the first beam into a first sample path, and

the second beam into a second sample path; and

a second beam splitter configured to combine the first beam and the second beam into a common axis.

2. The OCT system of claim 1 , wherein:

the first light source and the second light source are a wavelength swept source; and

the first light source and the second light source are configured to be swept alternately.

3. The OCT system of claim 1 , wherein:

the first beam splitter comprises a dichroic mirror configured to reflect or transmit the first beam and not reflect or transmit the second beam; and

the second beam splitter comprises a dichroic mirror configured to reflect or transmit the first beam and not reflect or transmit the second beam.

4. The OCT system of claim 1 , wherein the first beam having the first wavelength is configured to image a different image zone or depth range of a sample than the second beam of the second wavelength.

5. The OCT system of claim 4 , wherein the first beam is configured to image an anterior chamber of an eye and the second beam is configured image a retina of the eye.

6. The OCT system of claim 5 , wherein the first wavelength is a band of approximately 1300 nanometers and the second wavelength is a band of approximately 1060 nanometers.

7. The OCT system of claim 4 , wherein the first sample path has a divergent beam and a lateral scanning pattern perpendicular to the sample comprising:

a first lens system, and

a first scan mirror;

wherein the second sample path has a collimating beam with a convergent scanning pattern, a second lens system, and a second scan mirror;

wherein the second lens system comprises a first lens and a second lens configured in a 4f configuration, and the first lens system comprises the second lens; and

wherein the first beam is introduced to the second lens through the first scan mirror positioned at a focal point of the second lens through the second beam splitter.

8. The OCT system of claim 1 , wherein a path length difference between the first sample path and the second sample path is approximately an optical length equivalent to an axial length of a human eye.

9. The OCT system of claim 1 , wherein:

the interferometer comprises a reference path length switch configured to alternate a reference path length between a first reference length and a second reference length;

the first reference length corresponds to a first sample path length; and

the second reference length corresponds to a second sample path length.

10. The OCT system of claim 1 , further comprising a photo-detector and a processing unit configured to:

receive, through the photo-detector, the first beam and the second beam reflected from a sample; and

generate a first image and a second image of the sample based on the first beam and the second beam.

11. A method comprising:

emitting, by a first light source, a first beam having a first wavelength;

emitting, by a second light source, a second beam having a second wavelength;

directing the first beam and the second beam into an interferometer, wherein the interferometer comprises:

a reference path, and

an interferometer sample path;

dividing, by a first beam splitter from an output of the interferometer sample path:

the first beam into a first sample path, and

the second beam into a second sample path; and

combining, by a second beam splitter, the first beam and the second beam into a common axis.

12. The method of claim 11 , wherein the first light source and the second light source are a wavelength swept source and wherein the method further comprises sweeping the first light source and the second light source alternately.

13. The method of claim 11 , wherein:

the first beam splitter comprises a dichroic mirror configured to reflect or transmit the first beam and not reflect or transmit the second beam; and

the second beam splitter comprises a dichroic mirror configured to reflect or transmit the first beam and not reflect or transmit the second beam.

14. The method of claim 11 , further comprising:

imaging, from an output of a photo-detector, a first image zone or depth range of a sample with the first beam having the first wavelength; and

imaging, from the output of the photo-detector, a second image zone or depth range of the sample with the second beam having the second wavelength.

15. The method of claim 14 , wherein the first image zone or depth range of the sample is an anterior chamber of an eye and the second image zone or depth range of the sample is a retina of the eye.

16. The method of claim 15 , wherein the first wavelength is a band of approximately 1300 nanometers and the second wavelength is a band of approximately 1060 nanometers.

17. The method of claim 14 , wherein the first sample path has a divergent beam and a lateral scanning pattern perpendicular to the sample comprising:

a first lens system, and

a first scan mirror;

wherein the second sample path has a collimating beam with a convergent scanning pattern, a second lens system, and a second scan mirror;

wherein the second lens system comprises a first lens and a second lens configured in a 4f configuration, and the first lens system comprises the second lens; and

the method further comprising introducing, through the second beam splitter, the first beam into the second lens through the first scan mirror positioned at a focal point of the second lens.

18. The method of claim 11 , wherein a path length difference between the first sample path and the second sample path is approximately an optical length equivalent to an axial length of a human eye.

19. The method of claim 11 , further comprising alternating, with a reference path length switch of the interferometer, a reference path length between a first reference length and a second reference length, wherein:

the first reference length corresponds to a first sample path length, and

the second reference length corresponds to a second sample path length.

20. The method of claim 11 , further comprising:

receiving, by a processing unit, through a photo-detector, the first beam and the second beam reflected from a sample; and

generating, by the processing unit, a first image and a second image of the sample based on the first beam and the second beam.