Optical Pulse Shaper With Integrated Spatial Light Modulator
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Solution Overview
Problem
Conventional optical pulse shapers can only control frequency components on a pulse-by-pulse basis and require dividing the input pulse into multiple paths for full spectral amplitude, phase, and polarization control, leading to complex configurations and alignment errors.
Innovation Solution
An optical pulse shaper with a spatial light modulator at the Fourier plane, comprising individually addressable liquid crystal arrays, linear polarizers, and quarter-wave retardance waveplates, allows independent control of amplitude, phase, and polarization without requiring multiple paths, using a controller to electronically modify the retardance of liquid crystal elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional Fourier-domain pulse shapers with multiple paths are used to achieve full spectral amplitude, phase, and polarization control, then control capability is improved, but device complexity increases and alignment errors occur
Solution Approach 1:
The patent combines amplitude modulation, phase modulation, and polarization control functions into a single integrated spatial light modulator located at one Fourier plane. This merging of multiple control functions into one device eliminates the need for separate optical paths and reduces overall system complexity while maintaining full spectral control capability.
Solution Approach 2:
The spatial light modulator is designed to perform multiple functions simultaneously: it modulates amplitude, phase, and polarization of the optical pulse spectrum all at once. This multi-functional approach allows a single device to replace what would traditionally require multiple specialized components and optical paths.
2Adaptability or versatility
If multiple optical paths are used for full spectral control, then control capability is improved, but alignment precision deteriorates due to alignment errors
Solution Approach 1:
By consolidating all spectral control operations into a single optical path with one spatial light modulator, the invention eliminates multiple alignment interfaces. This reduces the cumulative alignment errors that would otherwise occur at each junction between multiple optical paths.
3Ease of operation
If conventional pulse shapers are used, then pulse-by-pulse control is achieved, but productivity decreases due to limited control efficiency
Solution Approach 1:
The spatial light modulator enables continuous and simultaneous control of amplitude, phase, and polarization parameters across the entire spectrum in a single operation. This continuous control capability eliminates the need for sequential pulse-by-pulse adjustments, significantly improving processing efficiency.
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 compact, stable, and efficient control of optical pulse amplitude, phase, and polarization for a single pulse, reducing alignment errors and allowing for more straightforward packaging.
Implementation Method 1
The spatial light modulator, under electronic control then modifies the retardance of the liquid crystal array elements to control the amplitude, phase and polarization state of the frequency components passing through them
Implementation Method 2
A conventional apparatus for ultrafast pulse shaping is a Fourier-domain pulse shaper, which performs a real space Fourier-transform on an input pulse, allowing for modification of the frequency components of the pulse
Implementation Method 3
A conventional approach to building an optical delay line for frequency-domain pulse shaping is to use diffraction gratings as the dispersive elements
Implementation Method 4
diffraction gratings as the dispersive elements and transmissive lenses as the focusing optics
Data Source
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AI summary
An optical pulse shaper includes an optical delay line; a spatial light modulator placed at the Fourier plane of the optical delay line having a spectral amplitude spatial light modulator; a spectral phase and polarization ellipticity spatial light modulator; and a spectral polarization rotator; and a controller configured to independently control an amplitude, a phase and polarization ellipticity, and a linear polarization of an optical pulse. A method for shaping an optical pulse is also provided.