Multiplex CARS Microscopy Device Using Abnormal Dispersion Fiber
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Solution Overview
Problem
Existing multiplex CARS microscopy devices require a delay line to synchronize the pump and Stokes beams, which complicates the device and reduces compactness.
Innovation Solution
A multiplex CARS microscopy device using an optical fiber to generate a supercontinuum in abnormal dispersion regime, allowing the device to operate without a delay line by maintaining sufficient power at the pump wavelength for stimulated Raman effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a delay line is used to synchronize pump and Stokes beams, then temporal synchronization is achieved, but device complexity increases and compactness is reduced
Solution Approach 1:
The patent merges the pump beam path and Stokes beam path by having both beams propagate through the same optical fiber. This integration eliminates the need for separate delay line components while maintaining temporal synchronization, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The optical fiber serves multiple functions simultaneously: it generates the supercontinuum Stokes spectrum, guides both pump and Stokes beams, and provides inherent temporal synchronization. This multi-functionality eliminates dedicated delay line components, reducing device complexity while maintaining synchronization reliability
2Reliability
If a delay line is used to synchronize pump and Stokes beams, then temporal synchronization is achieved, but compactness is reduced
Solution Approach 1:
The patent merges the pump beam path and Stokes beam path by having both beams propagate through the same optical fiber. This integration eliminates the need for separate delay line components while maintaining temporal synchronization, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The optical fiber serves multiple functions simultaneously: it generates the supercontinuum Stokes spectrum, guides both pump and Stokes beams, and provides inherent temporal synchronization. This multi-functionality eliminates dedicated delay line components, reducing device complexity while maintaining synchronization reliability
3Adaptability or versatility
If pump beam power is depleted during supercontinuum generation, then Stokes beam with multiple wavelengths is generated, but pump power for stimulated Raman effect is insufficient
Solution Approach 1:
The patent changes the dispersion regime parameter from normal to abnormal dispersion. This parameter change fundamentally alters the energy transfer dynamics during supercontinuum generation, preventing excessive pump depletion while still achieving broad spectral coverage, thus resolving the contradiction between spectral bandwidth and pump power
Solution Approach 2:
The patent applies different quality characteristics to different parts of the spectrum. By using abnormal dispersion, the system maintains high pump power at the central wavelength while still generating broad spectral content, allowing localized optimization of both pump power and spectral bandwidth
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves efficient generation of an anti-Stokes beam without the need for a delay line, enhancing compactness and simplifying operation while maintaining effective multiplex CARS microscopy capabilities.
Implementation Method 1
said first wavelength λ1, the second wavelengths being generated by non-linear conversion of the first wavelength λ1
Implementation Method 2
generate, from the primary beam, an output beam (FSC) having a plurality of second wavelengths forming a supercontinuum
Implementation Method 3
generate an anti-Stokes beam by stimulated Raman effect induced by at least one of the second wavelengths and the first wavelength λ1 present in the output beam
Data Source
AI summary
Multiplex CARS microscopy device for analysing a sample (Ech) comprising: -a laser source (LS) suitable for emitting a primary beam (FP) having a first wavelength λ1, in the form of pulses (IL1) with a power called the primary power; -an optical fibre (F) supporting fewer than ten modes, said pulses propagating through the optical fibre (F) in anomalous dispersion regime so as to generate, from the primary beam, an output beam (FSC) containing a plurality of second wavelengths forming a supercontinuum (SC), and said first wavelength λ1, the second wavelengths being generated by non-linear conversion of the first wavelength λ; -an optical system (MO) suitable for focusing the output beam onto said sample, so as to generate an anti-Stokes beam (STK) via stimulated Raman scattering induced by at least one of the second wavelengths and the first wavelength λ1 present in the output beam; -a photodetector (Det) suitable for detecting the anti-Stokes beam.