Ultrafast Space-Time-Frequency Measurement via Spatial Encoding
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Solution Overview
Problem
Traditional methods for measuring ultrafast optical fields are limited to time-domain resolution and cannot simultaneously obtain spatial and frequency information, resulting in one-sided results.
Innovation Solution
A real-time measurement method and system that performs space-time-frequency compression by generating an ultrafast-pulse optical signal, encoding it spatially, arranging it in a space-time distribution, loading frequency information, performing frequency-time delaying, and using a two-step iterative shrinkage/thresholding algorithm for decoding to obtain synchronized space-time-frequency information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional time-domain measurement techniques (autocorrelation, FROG, SPIDER) are used, then time domain resolution is improved (up to fs level), but spatial information and frequency information cannot be obtained simultaneously
Solution Approach 1:
The patent maps time-domain signals to spatial distribution by arranging ultrafast pulse sequences along the horizontal spatial direction, and maps frequency information to vertical spatial direction through spectral processing. This two-dimensional spatial mapping enables simultaneous measurement of time, space, and frequency information that traditional one-dimensional time-domain techniques cannot capture.
Solution Approach 2:
The patent combines multiple measurement dimensions (time, space, frequency) into a single integrated measurement system. By performing spatial encoding, spectral processing, and compression sensing simultaneously, the system obtains comprehensive space-time-frequency synchronized information in one measurement process, eliminating the need for separate measurements.
2Measurement precision
If traditional measurement schemes are used, then time domain resolution is achieved, but the measurement cannot be performed in real-time with full-field information
Solution Approach 1:
The patent performs spatial encoding and spectral processing in advance to compress the ultrafast pulse sequence information into a compact spatial distribution. This preliminary compression enables the measurement system to capture and process full-field space-time-frequency information simultaneously, achieving real-time measurement capability.
3Loss of information
If spatial encoding and spectral processing are performed, then space-time-frequency synchronized information is obtained, but measurement system complexity increases
Solution Approach 1:
The patent replaces complex mechanical scanning systems with optical field-based spatial encoding and spectral processing. By using optical methods to directly map time and frequency information onto spatial distributions, the system achieves comprehensive measurement without requiring complex mechanical movement or multiple separate measurement devices.
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 rapid, real-time measurement of ultrafast space-time-frequency synchronization information, overcoming limitations of existing methods and providing comprehensive data for ultrafast optical fields.
Implementation Method 1
performing intensity-modulated spatial encoding on the ultrafast-pulse optical signal, to obtain an encoded ultrafast-pulse optical signal
Implementation Method 2
performing frequency spectral processing on the space-time distribution encoding form of the encoded ultrafast-pulse optical signal, and loading frequency information of each ultrafast pulse on vertical spatial information
Implementation Method 3
performing frequency-time delaying on the encoded space-time-frequency synchronized ultrafast-pulse optical signal, to obtain a high-frequency-resolution encoded space-time-frequency synchronized ultrafast-pulse optical signal
Data Source
AI summary
The present application relates to a real-time measurement method and system for ultrafast space-time-frequency three-domain information based on space-time-frequency compression. The method includes: generating an ultrafast-pulse optical signal in a to-be-observed physical system; performing intensity-modulated spatial encoding on the ultrafast-pulse optical signal; arranging, by a space-time editor, a time-domain series of an encoded ultrafast-pulse optical signal in a horizontal space direction; performing, by a frequency-space editor, frequency spectral processing on a space-time distribution encoding form of the encoded ultrafast-pulse optical signal; performing, by a frequency-time delayer, frequency-time delaying on an encoded space-time-frequency synchronized ultrafast-pulse optical signal; performing, by an area array detector, real-time compression and acquisition on a high-frequency-resolution encoded space-time-frequency synchronized ultrafast-pulse optical signal, to obtain compressed encoded data information; and decompressing and decoding data according to the compressed encoded data information, to obtain space-time-frequency three-domain synchronization information of the ultrafast-pulse optical signal.