Supercontinuum Laser Spectrometer with Beam Diffuser and Dichroic Prism
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Solution Overview
Problem
Current sample investigation systems using electromagnetic radiation, such as reflectometers, spectrophotometers, ellipsometers, and polarimeters, face limitations in achieving high intensity, directional coherent spectra over a broad wavelength range (400-2500 nm) and struggle with spatial and temporal fluctuations due to coherence effects, which affect data accuracy and consistency.
Innovation Solution
The system employs a supercontinuum laser source that generates a high-intensity, highly directional coherent spectrum through non-linear processes, combined with speckle reducers like beam diffusers and dichroic beam splitter-prisms to optimize wavelength dispersion and detection, allowing for multiple detectors to handle separate wavelength ranges effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a supercontinuum laser source is used to provide high intensity, highly directional coherent spectrum, then the intensity and directionality of the electromagnetic radiation beam is improved, but spatial and temporal fluctuations due to coherence effects worsen data accuracy and consistency
Solution Approach 1:
A beam diffuser is introduced as an intermediary component between the supercontinuum laser source and the sample. This diffuser scatters the coherent beam to reduce spatial coherence, thereby eliminating speckle patterns and coherence-induced fluctuations while preserving the high intensity and broad spectral coverage of the original source.
2Adaptability or versatility
If a single detector system is used to cover a broad wavelength range (400-2500 nm), then the versatility of the system is improved, but the detection precision and optimization for specific wavelength ranges deteriorates
Solution Approach 1:
The broad wavelength range (400-2500 nm) is segmented into multiple sub-ranges, with each range detected by a specialized detector optimized for its specific band. This segmentation allows each detector to operate at peak efficiency for its designated wavelength range while collectively covering the entire 400-2500 nm spectrum through the coordinated system.
Solution Approach 2:
Different detectors are assigned to different wavelength ranges according to their optimal detection characteristics. Each detector is positioned and configured to detect specific wavelength bands where it performs best, creating a system where local detection quality is maximized for each wavelength region while maintaining overall spectral coverage.
3Measurement precision
If multiple detectors with separate wavelength range optimizations are used, then the measurement precision for specific wavelength ranges is improved, but the device complexity increases
Solution Approach 1:
The system employs a universal beam diffuser component that works across all wavelength ranges (400-2500 nm) to reduce coherence effects, combined with a modular detector arrangement where multiple detectors function together as an integrated system. This multi-functional approach achieves high precision across the full spectrum while managing complexity through shared optical path and coordinated operation.
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 provides a stable and consistent electromagnetic radiation beam, enabling more accurate sample investigation across a wide wavelength range without the need for reconfiguring sources and detectors, significantly improving data quality and consistency in reflectometry, spectrophotometry, ellipsometry, and polarimetry.
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
application of improved detector systems and beam diffusers to reduce spatial coherence
Implementation Method 6
combination dichroic beam splitter-prisms, (which can be optimized as regards wavelength dispersion characteristics)
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.