Multi-Channel Up-Conversion Infrared Spectrometer
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Solution Overview
Problem
Current infrared spectrometers face challenges with low-noise detection due to thermal background radiation and require high precision mechanical systems and cryogenic cooling, limiting their efficiency and cost-effectiveness, especially in scanning and wavelength range coverage.
Innovation Solution
The development of an infrared spectrometer with multiple up-conversion channels that convert infrared radiation to shorter wavelengths, allowing for detection with available detectors and reducing mechanical tolerances and cooling requirements, using nonlinear materials and demultiplexing techniques to cover an extended wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single up-conversion channel is used, then the device complexity is reduced, but the wavelength range coverage is limited
Solution Approach 1:
The spectrometer divides the broad wavelength range detection task into multiple segmented up-conversion channels, each optimized for specific wavelength ranges. This segmentation allows the system to cover a broader spectrum by combining results from multiple specialized channels rather than using a single general-purpose channel.
Solution Approach 2:
Each up-conversion channel is designed to handle multiple wavelength ranges through adjustable phase-matching conditions, making the channels multi-functional. The system achieves universal wavelength coverage by having each channel capable of operating across different spectral regions.
2Adaptability or versatility
If temperature tuning is used to phase-match different wavelength ranges, then the wavelength range is extended, but the acquisition time increases to minutes
Solution Approach 1:
The system dynamically adjusts phase-matching conditions for each up-conversion channel to optimize detection for different wavelength ranges. This dynamic adaptation allows rapid switching between wavelength ranges without the slow thermal equilibration required by temperature tuning methods.
Solution Approach 2:
The invention changes operational parameters (such as crystal orientation, beam angle, or mixing laser wavelength) to achieve phase-matching for different wavelength ranges, avoiding the need for slow temperature changes. This parameter adjustment approach enables rapid wavelength range switching while maintaining detection accuracy.
3Reliability
If cryogenically cooled detectors are used, then the signal-to-noise ratio is improved, but the operating cost and device complexity increase
Solution Approach 1:
The invention replaces the mechanical cooling system with an optical frequency conversion approach. By converting infrared radiation to visible or near-infrared wavelengths through non-linear optical processes, the system enables detection using room-temperature detectors, eliminating the need for complex cryogenic cooling infrastructure.
Solution Approach 2:
The up-conversion crystal acts as an intermediary that transforms the infrared signal into a form detectable by room-temperature detectors. This intermediary conversion process preserves the signal information while changing its wavelength, allowing high signal-to-noise detection without cryogenic cooling.
4Measurement precision
If high precision mechanical scanning systems are used, then the measurement precision is improved, but the cost and vibration sensitivity increase
Solution Approach 1:
The invention replaces mechanical scanning systems with a multi-channel optical detection approach. By using multiple up-conversion channels with different phase-matching conditions, the system achieves spectral resolution through optical means rather than mechanical positioning, eliminating vibration sensitivity and reducing mechanical complexity.
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 improves signal-to-noise performance and reduces acquisition time for spectral measurements, enabling cost-effective and vibration-tolerant infrared spectrometry without the need for cryogenic cooling, while covering a broader wavelength range efficiently.
Implementation Method 1
frequency up-conversion of the infrared radiation to shorter wavelengths
Implementation Method 2
up-conversion of the infrared radiation using a nonlinear crystal
Implementation Method 3
the phase-matching condition of the nonlinear material is generally dependent on an angle of the incoming radiation relative to an optical axis of the nonlinear material
Data Source
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Figure 9a~9c
AI summary
A multi-channel infrared spectrometer for detecting an infrared spectrum of light received from an object. The spectrometer comprises a wavelength converter system comprising a nonlinear material and having an input side and an output side. The wavelength converter system comprises at least a first up-conversion channel and a second up-conversion channel, and is arranged such that light traversing the wavelength converter system at different angles in the nonlinear material is imaged into different positions in an image plane. The first up- conversion channel is configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and correspondingly, the second up-conversion channel is configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second output wavelength range output on the second side. The spectrometer further comprises a demultiplexer configured for demultiplexing light in the first up-conversion channel and light in the second up-conversion channel. The demultiplexer is located on the first side or the second side of the wavelength converter system. Finally, the spectrometer comprises a spatially resolved detector arranged in the image plane to detect light in the first output wavelength range and second output wavelength range output of the wavelength converter system.