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Which optical components are used in the optical coherence tomography system?

Dec. 18, 2020

Optical coherence tomography technology uses broadband light sources with low-coherence to achieve optical tomography with high-resolution, which images scattering media, including biological tissues.

Basic structure

Optical coherence tomography technology is an imaging system based on fiber interferometer. It also includes photoelectric detection, signal processing and auxiliary platform  components. The fiber interferometer is mainly composed of SLD, laser, fiber coupler, horizontal and vertical scanning system (lens group: double convex lens, scanning galvanometer). The photodetection includes a fiber collimator (Aspheric lens or self-focusing lens), oscilloscope and photomultiplier. OCT systems are often combined with catheter probes, endoscopic probes or laparoscopic probes.

Optical Components

Laser mirror, lens group(double convex lens), scanning galvanometer, aspheric lens,  GRIN lens

Working Principle

After the light is emitted from the broadband light source, it is divided into two parts with a light intensity of 1:1 after passing through the optical fiber, and enters the reference arm and the sample arm respectively. After longitudinal scanning by the reference arm, the optical path on the reference arm is changed to control the scanning depth of the sample. The lateral scanning system on the sample arm is used to change the position of the incident light, thereby realizing the lateral direction of the sample scanning. When the light returned from the sample arm and the reference arm, meets the coherence condition and interferes again, the interference signal is detected by the photodetector. After the signal is amplified, band-pass filtered, and signal converted, the image processing will be obtained by the computer. That is the tomographic image of the sample.

Application fields

1. Detect subtle changes in the fundus tissue for the diagnosis of early pathological changes, such as glaucoma and diabetes.

2. Imaging of tissues, such as teeth and oral cavity.

3. For imaging of human gastrointestinal tissue, cardiovascular system and skin tissue.

4. Observe the changes in the tissues during the development of individual embryos.

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