Multiplex CARS Microscope Signal Optimization
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Solution Overview
Problem
Multiplex CARS microscopes face challenges with low signal intensities in CARS spectrum images, particularly in the fingerprint region, leading to prolonged measurement times due to varying signal intensities across wavenumber bands and chromatic aberration affecting the focus of broadband Stokes and pumping light.
Innovation Solution
An optical measurement device with mechanisms to adjust the power branching ratio between pumping and Stokes light in a photonic crystal fiber, and to align the focal points of broadband Stokes and pumping light on the sample, improving the signal-to-noise ratio by optimizing light intensity and focus for specific wavenumber bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiplex CARS microscope is used to obtain CARS signals across multiple wavenumber bands, then molecular identification capability is improved, but signal intensity becomes insufficient in the fingerprint region leading to prolonged measurement times
Solution Approach 1:
The patent adjusts the power branching ratio between pumping light and Stokes light as a key parameter to optimize CARS signal intensity. By changing the power distribution parameters, the system achieves enhanced signal intensity in the fingerprint region while maintaining multi-wavenumber band detection capability, thus resolving the contradiction between versatility and measurement speed
2Adaptability or versatility
If broadband Stokes light is used to achieve multiplex CARS spectroscopy, then spectral coverage is improved, but chromatic aberration causes focus misalignment between Stokes and pumping light
Solution Approach 1:
The patent introduces a focus adjustment mechanism as an intermediary element between the broadband Stokes light source and the sample. This mechanism compensates for chromatic aberration by independently adjusting the focal position of Stokes light, ensuring precise overlap with pumping light focus across the entire spectral range, thus maintaining both spectral coverage and focus alignment precision
3Measurement precision
If power to photonic crystal fiber is increased to enhance CARS signal, then signal-to-noise ratio is improved, but signal intensity distribution becomes uneven across wavenumber bands
Solution Approach 1:
The patent implements dynamic adjustment of the power branching ratio between pumping light and Stokes light based on the specific wavenumber band being measured. This dynamic parameter adjustment allows the system to optimize signal-to-noise ratio for each spectral region while maintaining relatively uniform signal intensity distribution across different wavenumber bands, resolving the contradiction between measurement precision and signal uniformity
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
This approach enhances the signal-to-noise ratio in desired wavenumber bands, allowing for faster and more accurate CARS spectrum imaging by emphasizing specific molecular vibrations and improving the spatial distribution of signal intensities.
Implementation Method 1
an optical fiber configured to generate supercontinuum light from the first light flux
Implementation Method 2
A coherent anti-Stokes Raman scattering (CARS) microscope is suitable for use in cell observation since the CARS microscope enables molecular identification at higher speed than a Raman microscope due to application of a non-linear optical effect
Data Source
AI summary
In multiplex CARS, a fingerprint region is a region where signals are densely concentrated. Information about the intensities and spatial distribution of these signals is important in cell analysis. However, there has been a problem in that the signal intensities are low. Accordingly, mechanisms 702 and 703 for adjusting the power branching ratio between light that enters a photonic crystal fiber 705 and pumping light; mechanisms 710 and 711 for adjusting the divergence/convergence state of the pumping light; and mechanisms 706 and 2101 for adjusting the divergence/convergence state of Stokes light are provided to enable adjustment for emphasizing a desired wavelength band.