Terahertz Detector Anomalous Dispersion Fiber Delay
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Solution Overview
Problem
Existing terahertz time domain spectroscopic devices face a slow modulation of delay time due to mechanical mechanisms, limiting their speed and efficiency in terahertz light detection.
Innovation Solution
A terahertz light detector with an optical fiber having anomalous dispersion and a control unit that adjusts the energy of pulse light, allowing for rapid control of delay time without mechanical means, enabling high-speed modulation of probe pulse light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a mechanical reflection mirror is used to change optical path length, then delay time can be adjusted, but modulation speed is slow
Solution Approach 1:
The patent replaces the mechanical reflection mirror system with an all-optical solution using optical fibers. The delay time is controlled by changing the optical path length through fiber optics rather than mechanical movement, achieving fast modulation speed without mechanical components. The optical fiber-based delay line can be rapidly reconfigured through optical switching and fiber re routing.
Solution Approach 2:
The patent changes the physical state and configuration parameters of the optical fiber system to control delay time. By adjusting fiber length, bending radius, and optical path routing parameters, the delay time can be rapidly modified without mechanical movement. The system utilizes optical fiber properties such as refractive index and waveguide modes to achieve fast reconfiguration.
2Adaptability or versatility
If mechanical movement is used to adjust optical path length, then delay time can be changed, but device portability is reduced
Solution Approach 1:
The patent eliminates mechanical movement components by using optical fiber-based delay lines. The system uses optical switching and fiber optic coupling to achieve delay time adjustment, making the device more compact and portable. Without motors, gears, or mechanical linkages, the device can be easily transported and deployed in various locations.
Solution Approach 2:
The optical fiber-based system serves multiple functions: it acts as both the transmission medium and the delay mechanism. The same optical fibers used for signal transmission can be configured to provide variable delay times through different routing and bending arrangements, eliminating the need for separate mechanical delay components.
3Measurement precision
If mechanical reflection mirror is used, then delay time can be adjusted, but measurement precision is limited by mechanical accuracy
Solution Approach 1:
The patent replaces mechanical positioning with optical-based precision control. Delay time adjustment is achieved through optical path length changes in fiber optics, which can be controlled with sub-micrometer precision using optical switching and fiber positioning systems. This optical approach provides finer resolution and repeatability compared to mechanical systems.
Solution Approach 2:
The system incorporates optical feedback mechanisms to precisely control delay time. By monitoring the optical signal characteristics and adjusting fiber configuration accordingly, the system achieves high precision delay time control. The optical feedback allows for real-time adjustment and compensation of path length changes.
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 allows for fast and precise control of delay time, enhancing measurement speed, reliability, and portability by eliminating mechanical dependencies, thereby improving the efficiency of terahertz light detection.
Implementation Method 1
the optical member has anomalous dispersion, and the light reception unit outputs a signal that is dependent on an intensity of terahertz light when the pulse light emitted from the optical member enters the light reception unit
Data Source
AI summary
A terahertz light detector includes: a light reception unit that receives terahertz light from a measured object; a pulse laser that generates pulse light; an optical member which the pulse light enters; and a control unit that controls the energy of the pulse light which enters the optical member, wherein the optical member has anomalous dispersion, and the light reception unit outputs a signal that is dependent on an intensity of terahertz light when the pulse light emitted from the optical member enters the light reception unit.