Stimulated raman scattering imaging light source based on photonic crystal fiber
A technology of photonic crystal fiber and stimulated Raman scattering, which is applied in the direction of laser scattering effect, phonon exciter, laser, etc., can solve the problems of high cost of laser, complex system structure, unstable beam, etc., and improve signal-to-noise Compared with the output power, high spectral resolution, and the effect of improving detection sensitivity
Active Publication Date: 2018-12-18
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
The first method has a complicated system structure, and the two lasers are expensive, which greatly increases the cost; the second method uses a solid-state laser that is not only affected by the environment, the beam is unstable, but also requires a high threshold for modulating the beam, and requires Regular maintenance by professionals
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[0016] Such as figure 1 The structure diagram of the photonic crystal fiber-based stimulated Raman scattering imaging light source module is shown,
[0017] The laser oscillator realizes the output of pulsed seed light through active or passive mode locking, and the output seed light passes through the pre-amplification module, and the average power is improved. There are two ways to connect the output of the pre-amplification module: one is to connect the pre-amplification module to the optical coupler first, and then connect to the main amplifying module to amplify the seed optical power again, that is, the main is placed in the parametric oscillation structure; the other is The pre-amplification module is first connected to the main amplifier module, and then connected to the optocoupler in turn, that is, the main part is placed outside the parametric oscillation structure. The output ends of the above-mentioned modules are sequentially connected to a parameter conversion ...
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The invention relates to a stimulated raman scattering imaging light source based on a photonic crystal fiber. The seed light output from a laser oscillator is amplified by a pre-amplification moduleand then output, and directly enters a parametric oscillation structure. The amplified pump light enters the parametric oscillation structure from the optical coupler, Stokes light is generated in a parametric conversion module composed of photonic crystal fibers by nonlinear effect of photonic crystal fibers, An output of the parametric conversion module is passed through an optical beam splitter, divide the beam into two paths, One direct output, the other feedback into the repetitive frequency tuning module and time delay module, change the repetitive frequency of the Stokes light participating in the feedback oscillation, provide the Stokes light synchronous with the pump light but different repetitive frequency coupled into the parametric oscillation structure through the optical coupler again, meet the needs of stimulated Raman scattering imaging light source. Stokes light and pump light having synchronization but different repetition frequency in a set of device is realized.
Description
technical field [0001] The invention relates to an imaging light source, in particular to a stimulated Raman scattering imaging light source based on a photonic crystal fiber. Background technique [0002] Coherent Raman Scattering (CRS) imaging technology is widely used in the fields of biology and medicine due to its label-free, non-invasive, non-destructive and chemical-specific characteristics, and the use of chemical bond vibrations as imaging contrast. There are two ways to realize CRS imaging, coherent anti-Stokes Raman Scattering (CARS) and stimulated Raman Scattering (Stimulated Raman Scattering, SRS). Among them, due to the presence of non-resonant background noise in CARS imaging technology, the peak value of the generated CARS scanning signal shifts in the frequency domain, which cannot completely correspond to the Raman signal, which will affect the accuracy of material composition analysis and reduce the sensitivity of imaging. . The SRS technology has no non...
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IPC IPC(8): H01S3/30
CPCH01S3/302
Inventor 杨康文吴昱兴沈悦郝强曾和平
Owner UNIV OF SHANGHAI FOR SCI & TECH