Swept source interferometric imaging systems and methods

Patent metadata

Field	Value
Publication number	US-9778018-B2
Application number	US-201514613121-A
Country	US
Kind code	B2
Filing date	Feb 3, 2015
Priority date	Feb 14, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Embodiments herein include swept-source interferometric imaging systems employing arbitrary sweep patterns in which a swept-source is swept over a continuous spectral range where the variation of wavelength over time is noncontinuous. Embodiments include sweep patterns that result in reduction of signals from moving scatterers and where the sweep is synchronized with the dead time of the camera.

First claim

The invention claimed is:

1. A method for imaging a sample interferometrically comprising:
illuminating the sample with a light source, said light source being swept over a range of frequencies;
detecting combined light returning from the sample and light from a reference arm at a detector and generating signals in response thereto;
processing said detected signals to generate an image of the sample,
wherein the light source is swept with an arbitrary sweep pattern and wherein the arbitrary sweep pattern covers a continuous range of wavelengths and wherein the variation of wavelength over time is non-continuous.

2. An interferometric imaging method as recited in claim 1 , wherein the light source illuminates a point on the sample.

3. An interferometric imaging method as recited in claim 1 , wherein the light source illuminates a line on the sample.

4. An interferometric imaging method as recited in claim 1 , wherein the light source illuminates a two dimensional area on the sample.

5. A method for imaging a sample interferometrically comprising:
illuminating the sample with a light source, said light source being swept over a range of frequencies;
detecting combined light returning from the sample and light from a reference arm at a detector and generating signals in response thereto, said detector having dead time between exposures; and
processing said detected signals to generate an image of the sample wherein the light source is either turned off during the dead time of the detector or the output of the light source is reduced during the dead time of the detector.

6. A method as recited in claim 5 , wherein the light source is swept using an arbitrary sweep pattern to cover a continuous range of wavelengths and wherein the variation of wavelength over time is non-continuous.

7. A method as recited in claim 5 , wherein the sweeping of the light source is halted during the dead time of the detector.

8. A method as recited in claim 5 , wherein the output of the light source is reduced during the dead time of the detector.

9. A method as recited in claim 5 , wherein the output of the light source is turned off during the dead time of the detector.

Assignees

• Zeiss Carl Meditec Inc

Inventors

• Schmoll Tilman
• Everett Matthew J

Classifications

• G01B9/02077

  of the object · CPC title

• G01B9/02091

  Tomographic interferometers, e.g. based on optical coherence · CPC title

• G01B9/02004 Primary

  using frequency scans · CPC title

• G01B9/02005

  using discrete frequency stepping or switching · CPC title

• A61B3/102

  for optical coherence tomography [OCT] · CPC title