Optical Pulse Spectrogram Replacement for Fast Waveform Control
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Solution Overview
Problem
Conventional techniques for controlling optical pulse waveforms are limited in their ability to control wavelength components and require lengthy calculations for approximating temporal intensity waveforms to desired waveforms.
Innovation Solution
A data generation device and method that includes transform units to repeatedly process waveform functions between frequency and temporal domains, replacing intensity spectrograms with target spectrograms and constraining phase spectrograms to accelerate calculation and improve accuracy, allowing control of wavelength components for each optical pulse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional iterative Fourier methods are used to calculate modulation data for approximating temporal intensity waveform to desired waveform, then the temporal intensity waveform can be controlled, but the calculation time is excessively long
Solution Approach 1:
The patent segments the calculation process into distinct transform domains (frequency domain, temporal domain, spectrogram domain) and applies different operations in each domain. By dividing the modulation data calculation into these manageable segments with specific transformation rules, the overall calculation efficiency is improved while maintaining waveform approximation accuracy.
Solution Approach 2:
The patent implements a dynamic iterative process where modulation data is refined through repeated transformations between different domains. The calculation adapts iteratively, adjusting the modulation parameters based on the discrepancy between desired and actual waveforms, which accelerates convergence while preserving accuracy.
2Shape
If spectral phase and spectral intensity are modulated to control temporal intensity waveform shape, then the waveform shape can be controlled, but the wavelength components cannot be controlled
Solution Approach 1:
The patent introduces a new dimension of control by incorporating wavelength-dependent phase modulation. Instead of only controlling temporal intensity waveform shape through spectral phase and intensity, the system adds wavelength component control as an additional degree of freedom, enabling both shape control and wavelength selection for each optical pulse.
Solution Approach 2:
The modulation data generation system achieves multi-functionality by simultaneously controlling temporal intensity waveform shape and wavelength components. A single set of modulation parameters accomplishes both waveform shaping and wavelength selection, making the system versatile for various applications requiring different pulse characteristics.
3Measurement precision
If modulation data is calculated to approximate temporal intensity waveform to desired waveform with high accuracy, then waveform precision is improved, but calculation complexity increases
Solution Approach 1:
The patent replaces complex direct optimization calculations with a series of simpler linear transformations between different domains (Fourier transforms, spectrogram transformations). By substituting the mechanical calculation process with domain transformations, the system achieves high waveform precision while reducing computational complexity.
Solution Approach 2:
The patent introduces intermediate representation forms (spectrograms, frequency domain representations) as mediators between the desired waveform and the modulation parameters. These intermediaries simplify the calculation by breaking down the complex approximation problem into manageable transformation steps, reducing overall calculation complexity while maintaining precision.
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 significantly reduces the time required for calculating modulation data and enhances the accuracy of approximating temporal intensity waveforms, enabling applications in devices like laser processing, ultra-high-speed imaging, and terahertz wave generation by varying wavelength for each optical pulse.
Implementation Method 1
a technique for shaping an optical pulse by modulating the spectral phase and/or the spectral intensity using a spatial light modulator (SLM)
Implementation Method 2
modulating the spectral phase and/or the spectral intensity using a spatial light modulator (SLM)
Implementation Method 3
a first transform unit transforms a first waveform function in a frequency domain including an intensity spectrum function and a phase spectrum function into a second waveform function in a temporal domain including a temporal intensity waveform function and a temporal phase waveform function
Data Source
AI summary
A Fourier transform unit transforms a first waveform function in the frequency domain into a second waveform function in the temporal domain. An STFT unit transforms the second waveform function into an intensity spectrogram and a phase spectrogram. A spectrogram replacement unit replaces the intensity spectrogram with an intensity spectrogram generated in advance and constrains the phase spectrogram. An inverse STFT unit transforms the intensity spectrogram after replacement and the phase spectrogram after constraint into a third waveform function in the temporal domain. An inverse Fourier transform unit transforms the third waveform function into a fourth waveform function in the frequency domain.