Integrated optical coherence analysis system
Optical coherence tomography (OCT) probe and system designs are disclosed that minimize the effects of mechanical movement and strain to the probe to the OCT analysis. It also concerns optical designs that are robust against noise from the OCT laser source. Also integrated OCT system-probes are included that yield compact and robust electro-opto-mechanical systems along with polarization sensitive OCT systems.
1. An integrated optical system for detecting an interference signal generated by an optical coherence tomography (OCT) probe, the integrated optical system comprising:
a package;
an optical bench in the package;
a detector system attached to the bench for detecting the interference signal, the detector system comprising at least one detector system beam splitter, a first interference detector for detecting a first polarization of an interference signal and a second interference detector for detecting a second polarization of the interference signal;
a polarization beam splitter system attached to the bench that receives an OCT signal from a swept source and couples the OCT signal to the OCT probe, which is external to the package, and couples the interference signal from the OCT probe to the first interference detector and the second interference detector of the detector system;
an input lens installed on the optical bench that forms a beam of the OCT signal that is transmitted through the at least one detector system beam splitter and the polarization beam splitter system; and
an output lens installed on the optical bench that receives the beam of the OCT signal from the input lens after passing through the at least one detector system beam splitter and the polarization beam splitter system.
2. A system as claimed in claim 1 , further comprising an amplitude reference beam splitter attached to the bench that receives the beam of the OCT signal from the input lens prior to the OCT signal being received by a polarization beam splitter of the polarization beam splitter system, the amplitude reference beam splitter reflecting a portion of the OCT signal and an amplitude detector for detecting the portion of the OCT signal.
3. A system as claimed in claim 1 , further comprising an input beam splitter attached to the bench that receives the beam of the OCT signal from the input lens prior to the OCT signal being received by a polarization beam splitter of the polarization beam splitter system, the input beam splitter reflecting a portion of the OCT signal and a k-clock optical reference attached to the bench for spectrally filtering the portion of the OCT signal and a k-clock detector, attached to the bench, for detecting the OCT signal filtered by the k-clock optical reference to generate a k-clock signal.
4. A system as claimed in claim 1 , further comprising a thermoelectric cooler for controlling the temperature of the optical bench.
5. An integrated OCT system, comprising:
a package having an optical window;
an optical bench in the package;
a swept source system implemented on the optical bench for generating an OCT signal, wherein the swept source system comprises a gain chip and a micro-electro-mechanical filter, which are secured to the optical bench;
a detector system attached to the bench for detecting an interference signal and comprising at least one detector system beam splitter;
an interferometer attached to the bench, the interferometer comprising a beam splitter system, a reference arm, and a signal arm, the beam splitter system receives the OCT signal from the swept source, couples a portion of the OCT signal to the signal arm and through the optical window to an object of interest, couples a portion of the OCT signal to the reference arm, and couples light returning from the reference arm and light returning from the object of interest to the detector system as the interference signal;
a first lens installed on the optical bench that forms a beam of the OCT signal that is transmitted through the detector system, the at least one detector system beam splitter, and the beam splitter system of the interferometer; and
an output lens installed on the optical bench that receives the beam of the OCT signal after transmission through the detector system, the at least one detector system beam splitter, and the beam splitter system of the interferometer and directs the beam onto the object of interest.
6. A system as claimed in claim 5 , further comprising an amplitude detector attached to the bench for detecting a portion of the OCT signal from the swept source system.
7. A system as claimed in claim 5 , further comprising a k-clock optical reference attached to the bench for spectrally filtering the OCT signal and a k-clock detector for detecting the OCT signal filtered by the k-clock optical reference to generate a k-clock signal.
8. A system as claimed in claim 5 , further comprising a thermoelectric cooler for controlling the temperature of the optical bench.
9. A system as claimed in claim 5 , wherein the beam splitter system comprises only a single beam splitter which is attached to the optical bench.
10. A system as claimed in claim 5 , wherein the reference arm is entirely contained within the package.
11. A system as claimed in claim 5 , wherein the swept source comprises a swept laser source.
12. A system as claimed in claim 5 , wherein the package is a butterfly or dual inline package.
13. A system as claimed in claim 1 , wherein the swept source comprises a swept laser source.
14. A system as claimed in claim 1 , wherein the output, lens couples the OCT signal into an optical fiber that transmits the OCT signal to the OCT probe.
15. A system as claimed in claim 1 , wherein the package is a hermetic package.
16. A system as claimed in claim 1 , wherein OCT signal generated by the swept source is coupled via optical fiber to the input lens installed on the optical bench.
17. A system as claimed in claim 7 , wherein the k-clock signal is received by an analog to digital sampling system to trigger the sampling of the detector system.
18. A system as claimed in claim 15 , wherein the hermetic package is a butterfly or dual inline package.
19. A system as claimed in claim 5 , wherein the package is a hermetic package.
20. A system as claimed in claim 1 , wherein the optical bench is less than 20 millimeters (mm) by 30 mm in size.
21. A system as claimed in claim 5 , wherein the optical bench is less than 20 millimeters (mm) by 30 mm in size.
22. A system as claimed in claim 1 , further comprising a thermoelectric cooler disposed between the optical bench and a bottom panel of the package.
23. A system as claimed in claim 5 , further comprising a thermoelectric cooler disposed between the optical bench and a bottom panel of the package.
24. A system as claimed in claim 5 , wherein the window is provided on a side of the package.
25. An integrated OCT system, comprising:
a hermetic package having an optical window;
an optical bench in the package;
a swept source system implemented on the optical bench for generating an OCT signal, wherein the swept source system comprises a gain chip and a micro-electro-mechanical filter, which are secured to the optical bench;
a detector system attached to the bench for detecting an interference signal and comprising at least one detector system beam splitter;
an interferometer attached to the bench, the interferometer comprising a beam splitter system, a reference arm, and a signal arm, the beam splitter system receives the OCT signal from the swept source, couples a portion of the OCT signal to the signal arm and through the optical window to an object of interest, couples a portion of the OCT signal to the reference arm, and couples light returning from the reference arm and light returning from the object of interest to the detector system as the interference signal;
a k-clock optical reference attached to the bench for spectrally filtering the OCT signal;
a k-clock detector for detecting the OCT signal filtered by the k-clock optical reference to generate a k-clock signal;
a first lens installed on the optical bench that forms a beam of the OCT signal that is transmitted through the detector system, the at least one detector system beam splitter, and the beam splitter system of the interferometer; and
an output lens installed on the optical bench that receives the beam of the OCT signal after transmission through the detector system, the at least one detector system beam splitter, and the beam splitter system of the interferometer and directs the beam onto the object of interest.