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A kind of soliton synthesis method and device based on rod photonic crystal fiber

A technology of photonic crystal fiber and synthesis method, which is applied in the field of optics, can solve the problems that the soliton single pulse energy does not meet the energy requirements of excitation light, and the three-photon fluorescence microscopic imaging cannot realize deep brain structure imaging, etc., to achieve deep brain structure imaging Effect

Active Publication Date: 2022-05-13
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to propose a method and device for synthesizing solitons based on rod-shaped photonic crystal fibers, so as to solve the problem that the soliton single-pulse energy that rod-shaped photonic crystal fibers can produce in the prior art does not meet the energy requirements of the excitation light in the 1700nm band. Three-photon fluorescence microscopic imaging of deep tissue cannot achieve deeper imaging of deep brain structures

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  • A kind of soliton synthesis method and device based on rod photonic crystal fiber
  • A kind of soliton synthesis method and device based on rod photonic crystal fiber
  • A kind of soliton synthesis method and device based on rod photonic crystal fiber

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Embodiment 1

[0050] Such as figure 1 As shown, the embodiment of the present invention provides a soliton synthesis method based on a rod-shaped photonic crystal fiber, and the soliton energy output by the rod-shaped fiber is improved through the synthesis of polarized solitons. The soliton energy after synthesis is twice that of the original single-path soliton energy. Meet the high-energy light source requirements for deep brain imaging in the 1700nm window. The soliton synthesis method based on rod photonic crystal fiber comprises the following steps:

[0051] S101. Splitting the preset pump pulse into two linearly polarized pump pulses with orthogonal polarization states, so that the two linearly polarized pump pulses with orthogonal polarization states are independently transmitted in the rod-shaped photonic crystal fiber, and Generate horizontally polarized solitons and vertically polarized solitons, respectively.

[0052] In the above step S101, the horizontally polarized soliton ...

Embodiment 2

[0089] The embodiment of the present invention characterizes the solitons generated in the first embodiment. Under the condition of the maximum output power of the laser, horizontally polarized and vertically polarized solitons with a wavelength of 1613nm are simultaneously generated.

[0090] In the embodiment of the present invention, it is assumed that in Embodiment 1, a linearly polarized pump pulse with a pulse width of 500 fs and a repetition rate of 1 MHz is used as the preset pump pulse; a rod-shaped photonic crystal with a length of 44 cm and a core diameter of 100 μm The optical fiber is used as a transmission fiber for horizontally polarized solitons and vertically polarized solitons, and a 1575nm long-pass filter is used to filter out the residual 1550nm pulses in a normal incidence mode, and the horizontally polarized solitons and vertically polarized solitons are separated and obtained.

[0091] Figure 4 It shows the spectral measurement data, in which, the lin...

Embodiment 3

[0104] Such as Image 6 As shown, the embodiment of the present invention provides a soliton synthesis device 60 based on a rod-shaped photonic crystal fiber, including: a femtosecond laser 61, a half-wave plate 62, a rod-shaped photonic crystal fiber 54, a first polarization separation device 63, a second polarization Separating device 65 and collimating lens group 66;

[0105] Femtosecond laser 61, half-wave plate 62, first polarization separation device 63, rod-shaped photonic crystal fiber 64 and second polarization separation device 65 are connected in sequence, and collimator lens group 66 is respectively arranged on the input end and output of rod-shaped photonic crystal fiber 64 end;

[0106] Femtosecond laser 61, used to output preset pump pulses with preset pulse width and preset repetition frequency;

[0107] The half-wave plate 62 and the first polarization separation device 63 are used to separate the preset pump pulse into two linearly polarized pump pulses wit...

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Abstract

The present invention is applicable to the field of optical technology, and provides a soliton synthesis method and device based on a rod photonic crystal fiber. The method includes: separating a preset pump pulse into two linearly polarized pump pulses with orthogonal polarization states, so that Independent transmission in the rod-shaped photonic crystal fiber produces horizontally polarized solitons and vertically polarized solitons; wherein, the horizontally polarized solitons and vertically polarized solitons have a delay when they are output to the rod-shaped photonic crystal fiber; then let the wavelengths of the horizontally polarized solitons and vertically polarized solitons Similarly, after the horizontally polarized soliton and vertically polarized soliton are separated, an opposite delay is introduced into the vertically polarized soliton, so that the horizontally polarized soliton and the vertically polarized soliton coincide in time, and the target soliton with double the energy of the soliton is synthesized . The invention can improve the soliton single pulse energy generated based on the rod-shaped photonic crystal fiber, so that it meets the energy requirement of the excitation light in the 1700nm wave band.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a soliton synthesis method and device based on a rod-shaped photonic crystal fiber. Background technique [0002] Multiphoton microscopic imaging is widely used in biology, physiology and medicine. Based on nonlinear optical technology, multiphoton microscopic imaging includes different imaging modalities, such as two-photon, three-photon and four-photon fluorescence. second, third and fourth harmonics etc. The main advantage of multiphoton imaging is based on the ability to penetrate deep tissues. Among many imaging modalities, three-photon fluorescence microscopy can achieve the greatest imaging depth, especially in living animal models. [0003] Three-photon fluorescence microscopy imaging of deep tissues needs to be excited by femtosecond pulses with a repetition rate at the megahertz level to meet the two conditions of the three-photon signal level and the average power of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01G02F1/35
Inventor 王科邱娉刘鸿吉庄自伟
Owner SHENZHEN UNIV