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OCT

OCT (optical coherence tomography)

OCT (optical coherence tomography) is a technology that uses the coherence of light to image fine structures inside samples.
It offers several advantages, including high speed, high resolution, non-invasiveness, and real-time observation. OCT is mainly used for non-invasive inspections in medical and industrial settings.

Principle and method

OCT is a technology that uses the coherence of light to measure distance in the direction that light travels. Near-infrared light is shone on the sample, and the light scattered and reflected back by the sample is combined with reference light passing through a fixed light path inside the OCT device. By detecting the light interference signal generated in this manner, a one-dimensional signal in the depth direction is obtained. It is possible to obtain tomographic images by continuously scanning the position of light incidence on the sample.

SD-OCT (spectral domain-OCT) method

Light from a broadband wavelength light source is shone on the sample, the interference light spectrally dispersed, then detected by a linear image sensor. An image in the depth direction of the sample is acquired by Fourier transforming the obtained wavelength information.

SS-OCT (swept source-OCT) method

The wavelength-swept light source sweeps the wavelength temporally and shines its output light on the sample, and the generated interference light is detected with a differential detector. An image in the depth direction of the sample is acquired by Fourier transforming the obtained wavelength information.

Fundoscopy

The state of the retina including swelling and bleeding can be analyzed by taking tomographic images of the retina and nerve fiber layer. This technology is used for early detection of the symptoms of diseases such as glaucoma, age-related macular degeneration (ARMD), and diabetic retinopathy, as well as follow-up examinations after treatment.

SD-OCT method

SS-OCT method

Recommended products

MEMS mirror S13124-01

MEMS mirror S13124-01

[for SD-OCT/SS-OCT]
It is an electromagnetically driven mirror capable of two-dimensional linear motion. It has a wide optical deflection angle and high mirror reflectivity.

MEMS mirror S12237-03P

MEMS mirror S12237-03P

[for SD-OCT/SS-OCT]
It is an electromagnetically driven mirror capable of one-dimensional linear motion. It has a wide optical deflection angle and high mirror reflectivity.

CMOS linear image sensor S15611

CMOS linear image sensor S15611

[for SD-OCT]
A CMOS linear image sensor with a readout rate of 40 MHz max. and a line rate of 34 kHz max.

CMOS linear image sensor S11639-01

CMOS linear image sensor S11639-01

[for SD-OCT]
A high-sensitivity CMOS linear image sensor using a photosensitive area with vertically long pixels (14 × 200 µm).

InGaAs linear image sensor G10768-1024D

InGaAs linear image sensor G10768-1024D

[for SD-OCT]
A 1024-pixel high-speed InGaAs linear image sensor with high sensitivity in the near-infrared region (0.9 to 1.7 µm).

SC (supercontinuum) light source L15077-C7

SC (supercontinuum) light source L15077-C7

[for SD-OCT]
It is a compact laser light source that emits broadband near-infrared laser light generated from nonlinear optical phenomenon induced by an ultrashort pulsed laser.

Balanced detectors C12668 series

Balanced detectors C12668 series

[for SS-OCT]
These are differential amplification type photoelectric conversion modules containing two Hamamatsu photodiodes with balanced characteristics.

Measuring depth of laser-drilled holes

In-line OCT measurement of laser welding makes it possible to follow the height of laser drill points, do seam tracking, and do 3D volume imaging. Because it can acquire internal information of a drilling target, it is possible to track and adjust the depth or shape of the drill point.

Measurement example

Quartz glass was processed with a femtosecond laser (center wavelength 800 nm). The structure of the processed part was then measured with an SS-OCT system using a wavelength-swept light source.

Measurement system

Measurement results

Recommended products

MEMS mirror S13124-01

MEMS mirror S13124-01

[for SS-OCT]
It is an electromagnetically driven mirror capable of two-dimensional linear motion. It has a wide optical deflection angle and high mirror reflectivity.

MEMS mirror S12237-03P

MEMS mirror S12237-03P

[for SS-OCT]
It is an electromagnetically driven mirror capable of one-dimensional linear motion. It has a wide optical deflection angle and high mirror reflectivity.

Balanced detectors C12668 series

Balanced detectors C12668 series

[for SS-OCT]
These are differential amplification type photoelectric conversion modules containing two Hamamatsu photodiodes with balanced characteristics.

Contact us for more information.

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