Supercontinuum Laser Reflectometer with Dichroic Beam Splitter-Prisms
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Solution Overview
Problem
Current reflectometer, spectrophotometer, ellipsometer, and polarimeter systems face challenges in achieving high intensity, directional electromagnetic radiation sources and effective detector systems that can optimize wavelength dispersion and reduce speckle effects for comprehensive sample analysis.
Innovation Solution
The system employs a supercontinuum laser source providing a high-intensity, directional coherent spectrum from 400 to 2500 nm, combined with speckle reducers like beam diffusers and dichroic beam splitter-prisms to produce and direct dispersed wavelengths to multiple detectors, optimizing wavelength detection and reducing interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional electromagnetic radiation source is used, then the system structure is simpler, but the beam intensity and directionality are insufficient
Solution Approach 1:
The system segments the broad spectrum electromagnetic radiation into multiple wavelength ranges using dichroic beam splitters, with each range directed to specialized detectors. This segmentation allows the use of a single high-intensity supercontinuum laser source while maintaining system manageability through modular detector architecture.
Solution Approach 2:
The supercontinuum laser source provides multi-functional capability by generating high-intensity radiation across a broad spectrum (400-2500 nm), replacing the need for multiple separate light sources. This universal source combined with wavelength-selective dichroic beam splitters achieves both high intensity and spectral versatility.
2Measurement precision
If a single detector is used for all wavelengths, then the device complexity is reduced, but the wavelength detection precision and optimization are compromised
Solution Approach 1:
The system applies local quality by matching specific wavelength ranges to detectors optimized for those ranges. Dichroic beam splitters direct different spectral regions (e.g., visible, NIR, SWIR) to detectors with appropriate sensitivity characteristics, ensuring each detector operates in its optimal performance regime for maximum measurement precision.
Solution Approach 2:
The system dynamically routes different wavelength components through the optical path using dichroic beam splitters, which selectively transmit or reflect specific wavelength ranges. This dynamic wavelength routing allows flexible optimization of detector selection based on the spectral content being measured.
3Illumination intensity
If coherent laser radiation is used, then the beam directionality and intensity are improved, but speckle interference effects increase
Solution Approach 1:
The system employs periodic modulation of the laser source at frequencies above detector response capabilities, converting continuous coherent radiation into pulsed operation. This periodic action reduces temporal coherence length, thereby minimizing speckle interference while preserving beam directionality and intensity for reflectometer and spectrophotometer measurements.
4Adaptability or versatility
If the system covers a broad wavelength range, then the analysis capability is enhanced, but the detector optimization for specific ranges becomes more difficult
Solution Approach 1:
The broad wavelength range (400-2500 nm) is segmented into distinct spectral regions using dichroic beam splitters, with each region directed to detectors optimized for that specific range. This segmentation enables the system to maintain broad spectral coverage while ensuring each detector operates in its optimal sensitivity range, preserving measurement precision across the entire spectrum.
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 configuration enables consistent and efficient sample investigation across a broad wavelength range, enhancing data accuracy and reducing temporal and spatial fluctuations in beam intensity, thereby improving the analysis capabilities of these systems.
Implementation Method 1
Non-linear processes include self-phase modulation, four-wave mixing, soliton dynamics and cross-phase modulation
Implementation Method 2
Non-linear processes include self-phase modulation, four-wave mixing, soliton dynamics and cross-phase modulation
Implementation Method 3
Non-linear processes include self-phase modulation, four-wave mixing, soliton dynamics and cross-phase modulation
Implementation Method 4
Non-linear processes include self-phase modulation, four-wave mixing, soliton dynamics and cross-phase modulation
Implementation Method 5
the refractive index of a material at a given frequency depends on the amplitude of electromagnetic radiation applied, (ie. the non-linear Kerr effect)
Implementation Method 6
combination dichroic beam splitter-prisms, (which can be optimized as regards wavelength dispersion characteristics)
Implementation Method 7
gratings and/or combination dichroic beam splitter-prisms, (which can be optimized as regards wavelength dispersion characteristics)
Implementation Method 8
a detector of electromagnetic radiation over a range of about 400-2500 nm
Data Source
AI summary
Reflectometer, spectrophotometer, ellipsometer, and polarimeter systems having a supercontinuum laser source of coherent electromagnetic radiation over a range of about 400-about 2500 nm, a stage for supporting a sample and a detector of electromagnetic radiation, wherein the supercontinuum source provides a coherent beam of electromagnetic radiation which interacts with a sample, and the detector system comprises functional combinations of gratings and/or combination dichroic beam splitter-prisms, which themselves can be optimized as regards wavelength dispersion characteristics, directs wavelengths in various ranges to various detectors that are well suited to detect them.