Waveform Data Generation for Light Control
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Solution Overview
Problem
Conventional technologies for controlling the temporal waveform of light, such as ultrashort pulse light, can only shape the intensity waveform and not control the wavelength components, limiting their application in devices like laser processing and terahertz wave generation.
Innovation Solution
A data creation apparatus and method that performs Fourier transforms, replaces and modifies waveform functions to align the spectrogram with a target spectrogram, allowing control of wavelength components by generating data for a spatial light modulator to modulate both intensity and phase spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional iterative Fourier transform algorithms are used to shape light pulses, then the temporal intensity waveform can be controlled, but the wavelength components (frequency components) of light cannot be controlled
Solution Approach 1:
The algorithm segments the control process into two independent stages: first controlling the temporal intensity waveform shape, then controlling the wavelength components. This is achieved by separately processing the amplitude spectrum and phase spectrum, and independently adjusting temporal profile and spectral characteristics through iterative Fourier transforms.
Solution Approach 2:
The invention adds a new control dimension by incorporating spectral domain processing alongside temporal domain shaping. By operating in both time and frequency domains and using spectrogram analysis, the system gains independent control over wavelength components while maintaining temporal waveform control.
2Device complexity
If only temporal intensity waveform control is implemented, then the control algorithm remains relatively simple, but the application range to various apparatuses is limited
Solution Approach 1:
The spectrogram serves as an intermediary representation that connects temporal and spectral domains. By using spectrogram analysis and optimization, the algorithm can control both temporal intensity and wavelength components without requiring completely separate control systems, thus managing complexity while expanding functionality.
Solution Approach 2:
The invention controls multiple parameters (temporal intensity profile, phase spectrum, wavelength components) through a unified iterative optimization process. By adjusting spectral phase and amplitude parameters independently while maintaining temporal coherence, the system achieves versatile control without proportionally increasing algorithmic complexity.
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 precise control of wavelength components of light, enhancing applications in various apparatuses by shaping the temporal intensity waveform and frequency components independently.
Implementation Method 1
a Fourier transform unit for performing a Fourier transform on a first waveform function in a frequency domain including an intensity spectrum function and a phase spectrum function
Data Source
AI summary
A Fourier transform is performed on a first waveform function in a frequency domain, and a second waveform function in a time domain including a temporal intensity waveform function and a temporal phase waveform function is generated. A replacement of the temporal intensity waveform function based on a desired waveform is performed for the second waveform function. The second waveform function is modified so as to bring a spectrogram of the second waveform function close to a target spectrogram generated in advance in accordance with a desired wavelength band. An inverse Fourier transform is performed on the modified second waveform function, and a third waveform function in the frequency domain is generated. Data is generated on the basis of an intensity spectrum function or a phase spectrum function of the third waveform function.