Ultra-high-speed orthogonal polarization imaging device and method

Abstract

The invention discloses an ultra-high-speed orthogonal polarization imaging device and method. The imaging method process is as follows: After filtering, dispersion, gain and orthogonal polarization multiplexing, the femtosecond laser is divided into two into orthogonal signal light and reference light, And the orthogonal polarization direction is along the fast and slow axis of the polarization maintaining fiber; the signal light first diffuses through the diffraction space, then enters the spatial optical imaging system, carries the sample information and then returns along the optical path; the signal light loaded with sample information and the reference light are connected to the optical The coherent receiver completes the optical coherent detection, converts the optical signal into an electrical signal, and then converts the electrical signal into a digital signal output through high-speed analog-to-digital conversion, and finally restores the image by computer demodulation. Compared with the traditional CCD imaging sensor, the present invention can obtain the polarization information of the sample at an ultra-high frame rate of 100 MHz under the condition of ensuring the micron-level imaging resolution, and the full digital acquisition based on the optical coherent receiver is beneficial to the later real-time Analysis and image optimization processing.

Description

technical field [0001] The invention belongs to the technical field of polarization microscopy imaging, in particular to ultrafast polarization imaging technology, and more specifically to a femtosecond laser ultrahigh-speed orthogonal polarization imaging device and method based on optical coherent detection. Background technique [0002] Polarized light imaging is a very important imaging technology in the field of optical imaging, which can provide multi-dimensional information of intensity, phase and polarization. Especially in the field of biomedical imaging, polarized light imaging technology has the advantages of no invasion, low damage to samples, and sensitivity to subwavelength structural changes. The change of the light polarization state is closely related to the microstructure of the sample, so the measurement of the light polarization state can obtain rich structural information of the tissue sample. In addition to imaging static tissue structures, polarizatio...

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Problems solved by technology

This mutual limitation between sensitivity and frame rate also affects almost all polarized light imaging systems

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