Diffractive Optical Detection for Broad Wavelength Separation
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Solution Overview
Problem
Existing optical detection systems require multiple systems or optical paths to detect a wide range of wavelengths, which is inefficient and cumbersome.
Innovation Solution
A diffractive optical element (DOE) designed to generate non-interfering diffraction patterns for different wavelengths, allowing a single system to distinguish laser light from other light sources across a wide range of wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical detection systems are used to detect different wavelength ranges, then the detection wavelength range is improved, but the device complexity increases
Solution Approach 1:
The patent implements a single optical detection system that can detect multiple wavelength ranges (e.g., 400-700nm visible light and 700-1400nm infrared light) by using a diffractive optical element with multiple grating structures. Each grating is designed for a specific wavelength range, but all gratings are integrated into one system that shares common optical paths, detectors, and control electronics, thereby achieving multi-wavelength detection without requiring separate optical systems for each range.
2Device complexity
If a single optical detection system is used, then the device complexity is reduced, but the detection wavelength range is limited
Solution Approach 1:
The diffractive optical element is segmented into multiple distinct grating structures, each optimized for a specific wavelength range. For example, one grating may be optimized for visible light (400-700nm) while another grating is optimized for infrared light (700-1400nm). These segmented gratings are positioned in sequence within the single optical system, allowing incident light to be diffracted differently based on its wavelength, thereby enabling the system to detect a broad spectrum of wavelengths through its segmented components.
3Measurement precision
If multiple optical paths are used for different wavelengths, then the measurement precision for each wavelength is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple optical paths into a single integrated optical detection system. Instead of having separate optical paths for different wavelength ranges, the system uses a shared optical path where light from different wavelength ranges travels through the same optical components (lenses, mirrors, detectors). The diffractive optical element with its multiple gratings directs different wavelength ranges to different detection regions within this shared path, maintaining measurement precision while eliminating the need for multiple separate optical paths and their associated control systems.
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
Enables efficient detection and differentiation of laser light from other light sources over a broad wavelength spectrum using a single optical detection system, reducing the need for multiple systems and paths.
Implementation Method 1
The DOE causes incident light at a first wavelength to generate a first diffraction pattern and incident light at a second wavelength different than the first wavelength to generate a second diffraction pattern distinguishable from the first diffraction pattern
Data Source
AI summary
An optical detection system includes a diffractive optical element (DOE) configured to receive incident light and a detector. The DOE causes incident light at a first wavelength to generate a first diffraction pattern and incident light at a second wavelength different than the first wavelength to generate a second diffraction pattern distinguishable from the first diffraction pattern, wherein the detector detects light diffracted by the DOE.