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.
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.
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.
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.
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.
It is an electromagnetically driven mirror capable of two-dimensional linear motion. It has a wide optical deflection angle and high mirror reflectivity.
It is an electromagnetically driven mirror capable of one-dimensional linear motion. It has a wide optical deflection angle and high mirror reflectivity.
A CMOS linear image sensor with a readout rate of 40 MHz max. and a line rate of 34 kHz max.
A high-sensitivity CMOS linear image sensor using a photosensitive area with vertically long pixels (14 × 200 µm).
Front-illuminated type CCD linear image sensor with a high-speed line rate [40 MHz max. (× 4 ports)]
A 1024-pixel high-speed InGaAs linear image sensor with high sensitivity in the near-infrared region (0.9 to 1.7 µm).
The use of a broadband light source in the 1700 nm band enables high-resolution imaging of deep, highly scattered biological tissue. In particular, SD-OCM (spectral domain - optical coherence microscopy) enables non-invasive deep brain neuronal imaging without craniotomy, and has been applied to in-vivo observation of Alzheimer's lesions.
Provided by Jun Zhu and Vivek J. Srinivasan (University of California Davis)
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.
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