Ultra-high-speed orthogonal polarization imaging device and method
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A technology of orthogonal polarization and imaging devices, which is applied in the direction of measuring devices, optical devices, instruments, etc., and can solve the problems of sensitivity and frame rate affecting polarized light imaging systems, etc.
Active Publication Date: 2021-07-23
JINAN UNIVERSITY
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This mutual limitation between sensitivity and frame rate also affects almost all polarized light imaging systems
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[0027] The present invention is based on the time-domain widening imaging technology of dispersion Fourier transform, which has been invented and extensively researched as a high-speed microscopic imaging technology that may be applied to microscopic real-time observation.
[0028] In this embodiment, as shown in Figure 1, a femtosecond laser ultra-high-speed orthogonal polarization imaging device based on optical coherent detection includes:
[0029]A femtosecond laser 1, a filter 2, a dispersion fiber 3, a fiber amplifier 4, a polarization controller 5, and a fiber polarizer 6 connected sequentially through a single-mode fiber; the first polarization-maintaining fiber connected to the fiber polarizer 6 through a polarization-maintaining fiber Polarization coupler 7, the first polarization maintaining coupler 7 includes two output branches, one of which is directly connected to a branch of the polarization beam combiner 9 through a polarization maintaining fiber, and the other...
Embodiment 2
[0036] In this embodiment, based on the femtosecond laser ultra-high-speed orthogonal polarization imaging device based on optical coherent detection disclosed above, an ultra-high-speed orthogonal polarization imaging method is disclosed, including the following steps:
[0037] S1, femtosecond laser preprocessing steps, femtosecond laser 1 generates broadband pulsed light, filter 2 filters the laser light emitted by femtosecond laser 1, selects a central wavelength of 1550nm and a suitable spectral width, and dispersive fiber 3 pairs filtered The laser light is broadened in the time domain through the group velocity dispersion effect, and the optical fiber amplifier 4 amplifies the power of the filtered laser light after dispersion.
[0038] S2, the generation step of orthogonal dual polarized light, the combination of the pretreated laser pulse through the polarization controller 5 and the fiber polarizer 6 to ensure the linear polarization state of the pulse, and then the li...
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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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