Terahertz Light Measurement Trigger Signal Stabilization
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Solution Overview
Problem
Conventional methods for measuring terahertz light through a device under test (DUT) suffer from jitter issues due to differences in the jitter of the terahertz light and the trigger signal, leading to inaccurate measurement results.
Innovation Solution
The implementation of an optical measurement device with a period difference adjustment unit that synchronizes the repetition frequencies of the pump and probe light pulses, using photoelectric conversion and amplification units to generate a stable trigger signal, thereby minimizing jitter in the measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SFG cross-correlation is used to generate the trigger signal, then the trigger signal can be obtained, but the power of the probe light and pump light decreases
Solution Approach 1:
The patent extracts a portion of the probe light and pump light specifically for trigger signal generation through photoelectric conversion, while the main beams continue with sufficient power for measurement. This separates the trigger generation function from the measurement beam path, allowing independent optimization of both.
Solution Approach 2:
The patent introduces photoelectric conversion units as intermediary components that convert optical signals to electrical signals for trigger generation. This intermediary conversion allows the trigger signal to be generated without directly reducing the power of the main probe and pump light beams used for measurement.
2Power
If photoelectric conversion and amplification are used to increase light power, then the light power increases, but jitter is generated in the measurement result
Solution Approach 1:
The patent extracts a small portion of the probe and pump lights for photoelectric conversion to generate the trigger signal, while the main beams retain their original power and timing characteristics for measurement. This extraction approach avoids introducing jitter to the main measurement paths.
Solution Approach 2:
The patent creates a copy of the probe and pump light signals through photoelectric conversion for trigger generation purposes. This optical-to-electrical copying allows trigger signal generation without affecting the original optical measurement paths, preserving measurement accuracy.
3Productivity
If the repetition frequencies of probe light and pump light are different, then asynchronous sampling can be achieved, but jitter occurs due to period differences
Solution Approach 1:
The patent implements feedback control by monitoring the actual timing of probe and pump light pulses and adjusting their repetition frequencies to maintain synchronization. This feedback mechanism ensures that the period difference remains controlled, allowing asynchronous sampling benefits while minimizing jitter in the measurement results.
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 effectively reduces jitter in the measurement results, enhancing the accuracy and reliability of terahertz light measurements by synchronizing the light pulses and stabilizing the trigger signal.
Implementation Method 1
a first photoelectric conversion unit that applies photoelectric conversion to the probe light pulse
Implementation Method 2
a second photoelectric conversion unit that applies photoelectric conversion to the pump light pulse
Implementation Method 3
a first amplification unit that amplifies an output from the first photoelectric conversion unit
Implementation Method 4
a second amplification unit that amplifies an output from the second photoelectric conversion unit
Implementation Method 5
a trigger signal output unit that outputs a cross-correlation of outputs of the first amplification unit and the second amplification unit as the trigger signal
Data Source
AI summary
A trigger signal generation device restrains a jitter from being generated in a measurement result of light, such as terahertz light, that has transmitted through a device under test. The device includes a first photoelectric conversion unit that applies photoelectric conversion to a probe light pulse, a second photoelectric conversion unit that applies photoelectric conversion to a pump light pulse, a first amplification unit that amplifies an output from the first photoelectric conversion unit, and a second amplification unit that amplifies an output from the second photoelectric conversion unit. The device also includes a trigger signal output unit that outputs a cross-correlation of outputs of the first amplification unit and the second amplification unit as a trigger signal, and a period difference adjustment unit that adjusts a difference in periods.