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Dispersion compensating method and system for optically coherent chromatographic imaging

A technology of optical coherence tomography and dispersion compensation, which is used in material analysis, optics, and optical components by optical means, and can solve the problems of third-order dispersion mismatch, inability to compensate at the same time, and longitudinal resolution lower than the theoretical value. Achieve the effect of wide compensation spectral range, large dispersion adjustment range and small residual dispersion

Inactive Publication Date: 2007-01-03
ZHEJIANG UNIV
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Problems solved by technology

However, the different signs of group velocity dispersion (GVD) and third-order dispersion (TOD) introduced by this method cannot compensate the positive GVD and TOD introduced by the above-mentioned crystal at the same time, that is, the system dispersion can only be matched to the second order, but there are still serious problems. Third-order dispersion mismatch, which makes the actual vertical resolution of the system lower than the theoretical value due to dispersion mismatch

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  • Dispersion compensating method and system for optically coherent chromatographic imaging
  • Dispersion compensating method and system for optically coherent chromatographic imaging
  • Dispersion compensating method and system for optically coherent chromatographic imaging

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[0019] The principle and specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] The invention adds a blazed grating between the fiber collimating mirror of the original conventional single grating RSOD and the original blazed grating, which is placed parallel to the original blazed grating and has the same direction of the grating lines. Such as figure 2 As shown, the double grating RSOD is composed of a fiber collimator 1 , a blazed grating 2 , a Fourier transform lens 3 , a vibrating mirror 4 , a plane mirror 5 and a blazed grating 6 . The low-coherent light with a broadband spectrum is emitted from the fiber collimator 1 and diffracted on the blazed grating 2 first. Subsequently, the light of each wavelength is diffracted again on the blazed grating 6, and through the Fourier transform lens 3, the light of each wavelength will be focused on the vibrating mirror 4, and the light reflected by ...

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Abstract

The present invention discloses dispersion compensating method and system for optically coherent tomographic imaging (OCT). The system has one increased blazed grating parallelly set with the original blazed grating in a single grating fast scanning optical delay line, and thus one independently regulated variable of interval between two blazed gratings and capacity of generating group velocity dispersion and third-order dispersion in great varying range and arbitrary sign combination, so that the OCT system may obtain precise matching between the dispersion of the reference arm and the dispersion of the sample arm and longitudinal resolution approaching the theoretical calculated value. The double grating system has wide dispersion regulating range, wide compensation spectrum range and small residual dispersion other than the capacity of independently controlling phase delay and group delay, and possesses three functions of depth scan, phase modulation and dispersion compensation.

Description

technical field [0001] The invention relates to an optical coherence tomography (OCT) technology, in particular to a dispersion compensation method and system in the optical coherence tomography. Background technique [0002] Optical coherence tomography (OCT) is a biomedical optical imaging technology with tomographic function. It is an important minimally invasive imaging tool that can perform clinical functions such as early diagnosis, process monitoring, and surgical guidance. OCT, with its advantages of ultra-high resolution, ultra-fast imaging speed, no radiation damage, diversity of optical information, moderate price, compact structure, and good compatibility with existing medical instruments, is currently widely favored in clinical medicine. Optical means that play an important role in the [0003] In structural OCT and various functional OCT systems, it is necessary to introduce Doppler frequency shift to realize heterodyne modulation. Doppler shift is usually a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B10/00G01N21/84G02B27/44
Inventor 丁志华李栋孟婕王凯王玲杨亚良黄刚
Owner ZHEJIANG UNIV
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