Mid-Infrared Upconversion Imaging Using Chirped Crystal and Optical Cavity
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Solution Overview
Problem
Existing mid-infrared imaging technologies face challenges such as low sensitivity, slow response speed, high noise, and limited field of view, which hinder their application in fields requiring high-resolution and large-field-of-view imaging.
Innovation Solution
The proposed mid-infrared upconversion imaging method utilizes a nonlinear frequency upconversion technology with a chirped polarization crystal, combined with an optical external cavity enhancement structure, to convert mid-infrared photons to visible light, enabling high-sensitivity, high-speed, and high-resolution imaging at room temperature without mechanical scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mid-infrared imaging technologies are used, then imaging can be performed, but sensitivity is low and noise is high
Solution Approach 1:
The patent introduces a chirped polarization crystal as an intermediary component that enables wavelength conversion from mid-infrared to visible band. This mediator allows the use of high-sensitive visible-band detectors while maintaining mid-infrared detection capability, thereby improving sensitivity and reducing noise without requiring complex cooling systems
Solution Approach 2:
The patent changes the operational wavelength parameter from mid-infrared to visible band through nonlinear frequency upconversion. By transforming the detected wavelength to a range where silicon-based detectors operate optimally, the system achieves ultra-sensitive detection with reduced noise floors
2Speed
If conventional imaging methods are used, then imaging is possible, but response speed is slow
Solution Approach 1:
The patent replaces mechanical scanning systems with a static optical cavity configuration that enables simultaneous imaging across a large field of view. The optical cavity with chirped crystal component allows parallel processing of multiple spatial frequencies, eliminating mechanical movement delays and achieving fast response speeds
3Area of stationary object
If conventional imaging technologies are used, then imaging can be performed, but field of view is limited
Solution Approach 1:
The patent transitions from one-dimensional linear scanning to two-dimensional field of view capture by utilizing the optical cavity's ability to simultaneously process multiple spatial frequencies. The chirped crystal component enables wavelength-dependent spatial filtering that expands the field of view without requiring additional mechanical degrees of freedom
Solution Approach 2:
The optical cavity system performs multiple functions simultaneously: it enhances pump laser power, enables wavelength conversion, provides spatial filtering, and achieves large field of view imaging. This multi-functionality reduces the need for separate components and simplifies the overall system while expanding imaging capabilities
4Area of stationary object
If mechanical scanning is used to expand field of view, then imaging coverage increases, but imaging speed decreases
Solution Approach 1:
The optical cavity enables continuous imaging across the entire field of view without interruption from mechanical scanning. The chirped polarization crystal continuously converts mid-infrared wavelengths to visible band across all spatial frequencies simultaneously, maintaining uninterrupted data acquisition and eliminating scanning-induced delays
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 achieves ultra-sensitive mid-infrared imaging with a large field of view, improving sensitivity, speed, and resolution while reducing noise, and is suitable for various applications including space detection, biological imaging, and medical diagnostics.
Implementation Method 1
the signal light in a mid-infrared wavelength band is converted to light in a visible wavelength band
Implementation Method 2
The pump light is incident into the optical cavity to superimpose the pump light in the optical cavity to increase average power
Implementation Method 3
a first focusing lens and a second focusing lens placed in front of and behind the optical cavity, respectively
Data Source
AI summary
A mid-infrared upconversion imaging method and a mid-infrared upconversion imaging device are provided, which are used for imaging detection in a mid-infrared wavelength band, and related to a technical field of infrared imaging. The method includes directing pump laser and mid-infrared light into a chirped crystal component located in an optical cavity to obtain visible light; and imaging an object with the visible light.