Terahertz Spectroscopy Prism Avoidance Portion
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Solution Overview
Problem
Existing terahertz wave spectroscopic measurement devices face challenges in achieving high-speed detection due to the difficulty in suppressing interactions between probe light and the measurement target, which can alter the target's quality or temperature, affecting detection accuracy.
Innovation Solution
A terahertz wave spectroscopic measurement device is designed with an internal total reflection prism that includes an avoidance portion to prevent probe light from interacting with the measurement target, using optical branching portions or air gaps to separate the optical paths of terahertz waves and probe light, ensuring only terahertz waves are incident on the target, thereby preventing changes in the target's quality or temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a quantum cascade laser is applied to generate both terahertz waves and probe light for high-speed indirect detection, then detection speed is improved, but the probe light may interact with the measurement target causing changes in quality or temperature that affect detection accuracy
Solution Approach 1:
The optical path is segmented into separate channels: the terahertz wave optical path passes through the measurement target for interaction, while the probe light optical path is diverted to avoid the measurement target. This segmentation allows both beams to coexist without harmful interactions, enabling high-speed detection while maintaining measurement accuracy.
Solution Approach 2:
A beam splitter or optical element is introduced as an intermediary to separate the probe light from the measurement target path. This intermediary component redirects the probe light to a different path while allowing terahertz waves to pass through the measurement target, thus preventing direct interaction between probe light and the target.
2Ease of operation
If the probe light is incident on the measurement target to enable indirect detection, then terahertz wave detection can be performed, but the measurement target's temperature and quality may change affecting detection accuracy
Solution Approach 1:
The harmful function of probe light interaction with the measurement target is extracted and removed from the system. The probe light is taken out of the measurement path and directed to a separate detection path, eliminating the harmful thermal and quality changes while preserving the useful indirect detection capability.
Solution Approach 2:
The probe light that would otherwise cause harmful heating and quality changes is redirected to serve a beneficial purpose: providing the reference beam for indirect detection without interacting with the measurement target. The same light source serves both functions through optical path separation.
3Device complexity
If probe light and terahertz waves share the same optical path through the internal total reflection prism, then device complexity is reduced, but the probe light causes optical path deviations due to temperature changes in the prism
Solution Approach 1:
The optical path within the internal total reflection prism is segmented into separate trajectories for terahertz waves and probe light. By using different incident angles or spatial positions, the two beams follow distinct paths, preventing thermal crosstalk and optical path deviations while maintaining a relatively simple prism-based structure.
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 accurate and high-speed detection of terahertz waves by minimizing interactions between the probe light and the measurement target, enhancing detection accuracy and preventing optical path deviations caused by temperature changes.
Implementation Method 1
the internal total reflection prism internally totally reflecting the terahertz waves incident from the incidence surface by means of the placement surface and emitting the terahertz waves from the emission surface
Implementation Method 2
terahertz waves and probe light having a wavelength different from that of the terahertz waves are incident on a nonlinear crystal, wavelength conversion is performed, and the terahertz waves are indirectly detected on the basis of wavelength converted light
Implementation Method 3
Nonlinear optical detection of terahertz-wave radiation from resistant tunneling diodes
Data Source
AI summary
A terahertz wave spectroscopic measurement device includes a light source that emits a terahertz wave and probe light having a wavelength different from that of the terahertz wave, an internal total reflection prism including an incidence surface of the terahertz wave, a placement surface on which a measurement target is placed, and an emission surface of the terahertz wave, the internal total reflection prism internally totally reflecting the terahertz wave incident from the incidence surface by means of the placement surface and emitting the terahertz wave from the emission surface, and a terahertz wave detection unit that indirectly detects the terahertz wave emitted from the emission surface using the probe light. The internal total reflection prism includes an avoidance portion on which incidence of the probe light on the measurement target on the placement surface is avoided.