Time Domain Amplification for Mid-Infrared Ultrafast Light Signals
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Solution Overview
Problem
Current detectors in the mid-infrared band are unable to effectively detect mid-infrared ultrafast light signals, limiting their application in high-speed, real-time, and low-noise environments, which restricts the development of mid-infrared laser technology.
Innovation Solution
A high-speed real-time sampling and measuring device based on time domain amplification, utilizing a time domain amplification unit with a beam combiner, dispersive media, and a high-nonlinearity lithium niobate waveguide to convert mid-infrared ultrafast light signals into a near-infrared/visible band for efficient detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional mid-infrared detectors are used, then detection in the mid-infrared band is possible, but the response rate is limited and real-time high-speed detection cannot be achieved
Solution Approach 1:
The patent applies preliminary action by performing time-domain amplification on the mid-infrared ultrafast light signal before detection. The signal is amplified in the time domain using a combiner, dispersive media, and non-linear optical medium, converting it to a near-infrared/visible band signal with higher energy. This preliminary amplification enables subsequent detectors to accurately capture the signal, achieving both high-speed real-time detection and maintained measurement precision.
2Power
If mid-infrared ultrafast light signals are detected directly, then the original signal characteristics are preserved, but the signal strength is insufficient for high-speed real-time detection
Solution Approach 1:
The patent introduces an intermediary time-domain amplification system consisting of a combiner, dispersive media, and non-linear optical medium. This intermediary converts the weak mid-infrared ultrafast light signal into a stronger near-infrared/visible band signal through four-wave mixing and time-domain amplification processes. The intermediary transformation enables direct detection with conventional detectors while maintaining signal integrity and enhancing signal strength for high-speed real-time detection.
3Productivity
If the detection bandwidth is increased to achieve high-speed sampling, then the sampling rate improves, but the noise level increases and detection reliability decreases
Solution Approach 1:
The patent applies parameter changes by transforming the signal from the mid-infrared band to the near-infrared/visible band through non-linear optical processes. This parameter change (frequency conversion) allows the signal to be detected by conventional detectors with higher bandwidth and better signal-to-noise ratios. The time-domain amplification process also changes the temporal parameters of the signal, stretching it in time while maintaining its essential characteristics, enabling high-speed sampling with improved reliability.
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 high-speed real-time sampling and measurement of mid-infrared ultrafast light signals with subpicosecond time resolution, breaking response rate limitations and achieving low-distortion amplification, suitable for femtosecond-level signals with improved sensitivity and practicality.
Implementation Method 1
a high-nonlinearity lithium niobate waveguide to convert mid-infrared ultrafast light signals into a near-infrared/visible band
Implementation Method 2
dispersive media, and a high-nonlinearity lithium niobate waveguide to convert mid-infrared ultrafast light signals
Data Source
AI summary
A device for high-speed real-time sampling of mid-infrared ultrafast light signals includes a time domain amplification unit and a detection unit. The time domain amplification unit is used to perform sampling and time domain amplification on signal light incident to the time domain amplification unit, and convert the signal light of a mid-infrared band into a near-infrared/visible band. The detection unit is used to receive and record information of the to-be-detected signal light processed by the time domain amplification unit to realize high-speed real-time sampling and measurement of the mid-infrared ultrafast light signal. The present disclosure can accurately obtain subpicosecond transient characteristics of the light signal, breaks through the capacity limit to the response rate of a traditional photoelectric detector, the bandwidth of the oscilloscope and the like, and is applicable to femtosecond-level mid-infrared ultrafast light signals.