Cross-Axis Parallel Spectroscopy Using Cascaded Diffractive Elements
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Solution Overview
Problem
Conventional spectrometers face limitations in dynamic range and crosstalk due to inherent design constraints, making them less competitive for high dynamic range applications compared to monochromators, which are slow and not suitable for parallel spectral manipulation.
Innovation Solution
The use of cross-axis multiple diffractive elements, such as prisms and VIPA etalons, in a cascaded configuration with image rotators like Dove Prisms, allows for simultaneous measurement and filtering of multiple spectral components with improved dynamic range and reduced stray light, enabling high-resolution spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional spectrometers use parallel detection with array detectors, then measurement speed is improved, but dynamic range is limited to about 30-35 dB
Solution Approach 1:
The spectrometer is divided into multiple detection channels, each dedicated to measuring specific spectral components in parallel. This segmentation allows simultaneous measurement of multiple frequencies while maintaining high dynamic range in each channel, resolving the contradiction between speed and precision.
Solution Approach 2:
The patent introduces a new dimensional approach by using multiple diffractive elements arranged in series, each adding another dimension of spectral separation. This creates a multi-dimensional spectral space where parallel detection can occur at multiple levels simultaneously, achieving both high speed and high dynamic range.
2Measurement precision
If monochromators are used to achieve high dynamic range and low crosstalk, then measurement precision is improved, but measurement speed deteriorates due to sequential measurement
Solution Approach 1:
The patent merges the advantages of monochromators (high dynamic range through multiple diffractive elements) with the advantages of spectrometers (parallel detection). By combining multiple stages of spectral dispersion with parallel detection capabilities, the system achieves both high precision and high speed simultaneously.
Solution Approach 2:
The system maintains continuous spectral measurement capability by using multiple diffractive elements that operate simultaneously rather than sequentially. The useful action of spectral dispersion continues without interruption across multiple stages, enabling both high dynamic range and fast measurement.
3Device complexity
If single grating is used for spectral dispersion, then device complexity is reduced, but resolution and dynamic range deteriorate
Solution Approach 1:
The patent employs a nested structure where multiple diffractive elements are arranged in series, with each element adding another layer of spectral separation. This nesting approach achieves high resolution and dynamic range by combining the dispersive power of multiple elements while maintaining a compact, organized structure.
Solution Approach 2:
The spectral dispersion function is segmented across multiple diffractive elements, with each element handling a portion of the spectral separation task. This segmentation allows the system to achieve high resolution through cumulative dispersion while keeping each individual element relatively simple.
4Productivity
If conventional spectrometers are used, then parallel measurement is achieved, but stray light cannot be blocked and crosstalk remains high
Solution Approach 1:
The patent introduces intermediate blocking masks and additional diffractive elements between the input beam and the detector array. These intermediary components act as mediators that selectively block stray light and prevent crosstalk between different spectral channels while preserving the parallel measurement capability.
Solution Approach 2:
The system applies preliminary anti-action by using blocking masks and multiple diffractive stages to prevent stray light and crosstalk before they reach the detector. By addressing these harmful factors in advance through multiple dispersion stages and blocking elements, the system maintains parallel measurement while eliminating interference.
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 dynamic range by more than an order of magnitude and achieves high spectral resolution, overcoming the limitations of traditional spectrometers and monochromators, allowing for efficient parallel measurement of spectral components with reduced crosstalk.
Implementation Method 1
Optical dispersive elements, such as diffraction gratings, prisms, and VIPA etalons, have been used in the art to separate spectrum of an input beam by dispersing its spectral components into different spatial directions.
Implementation Method 2
The spatial separation of light into its spectral components facilitates various operation on the incoming radiation
Implementation Method 3
In between thereof, an image rotator (e.g., a Dove Prism) can change the orientation of the dispersive axis to facilitate convenient cascading.
Data Source
AI summary
An exemplary embodiment of apparatus and method to measure and filter the spectrum of electro-magnetic radiation using multiple dispersive elements, such as diffraction gratings or VIPA etalons, concatenated in a cross-axis orthogonal arrangement can be provided. For example, it is possible to receive at least one first electro-magnetic radiation and generate at least one second electro-magnetic radiation using at least one first spectral separating arrangement. A first spectrum of the second electro-magnetic radiation can be dispersed along at least one first dispersive axis with respect to a propagation direction of the second electro-magnetic radiation. In addition, it is possible to, using at least one second arrangement, receive the second electro-magnetic radiation and produce at least one third electromagnetic radiation having a second spectrum dispersed along at least one second dispersive axis with respect to a propagation direction of the third electromagnetic radiation. The orientations of the respective first and second dispersive axes can be different from one another. The first and/or second dispersive arrangements can be VIPA etalon arrangements.