Ultra-high-speed orthogonal polarization imaging device and method

Abstract

The invention discloses an ultra-high-speed orthogonal polarization imaging device and method, and the imaging method comprises the following steps: carrying out filtering, dispersion, gain and orthogonal polarization multiplexing for femtosecond laser, dividing the femtosecond laser into two parts, i.e., orthogonal signal light and reference light, and enabling the orthogonal polarization direction to be along the fast and slow axes of a polarization maintaining optical fiber; enabling the signal light to be dispersed through the diffraction space, enter a spatial light imaging system, carrysample information, and return along a light path; accessing the signal light loaded with sample information and reference light to an optical coherent receiver together to complete optical coherent detection, converting the light signal into an electric signal, subjecting the electric signal to high-speed sampling and conversion through high-speed analog-to-digital conversion so as to form a digital signal to be output, and finally, demodulating and restoring an image by a computer. Compared with a traditional CCD imaging sensor, the polarization information of a sample can be obtained at anultrahigh hundred MHz frame rate under the condition that the micron-scale imaging resolution is guaranteed, and full-digital acquisition based on the optical coherent receiver is beneficial to later-period 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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