Switchable Plate Compensator for Microscope Pulse Dispersion
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Solution Overview
Problem
Pulsed light irradiating a sample in an optical microscope experiences group delay dispersion, leading to a reduction in excitation efficiency, particularly in three-photon microscopes where conventional methods fail to compensate for negative group delay dispersion effectively.
Innovation Solution
A compensator with multiple plates generating positive group delay dispersion and a switching unit to adjust plate positions based on wavelength, allowing for effective compensation of negative group delay dispersion in three-photon microscopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to compensate for group delay dispersion, then compensation for positive group delay dispersion is achieved, but compensation for negative group delay dispersion fails
Solution Approach 1:
The patent employs a switching unit that dynamically adjusts the position of plates in the compensator based on the wavelength of incident light. This dynamic configuration allows the system to adapt between different compensation states, enabling effective compensation for both positive and negative group delay dispersion across varying wavelengths
Solution Approach 2:
The patent changes the physical state of the compensator by switching plates between transmitted and blocked positions. This parameter change enables the system to transition from a state that compensates for positive group delay dispersion to a state that compensates for negative group delay dispersion, depending on the wavelength
2Manufacturing precision
If multiple plates are used to compensate for group delay dispersion, then compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The compensator is segmented into multiple plates that can be independently controlled. Each plate contributes to the overall group delay dispersion compensation, and the switching unit selectively activates specific plates based on the required compensation amount and wavelength, achieving precise control without requiring all plates to be permanently installed
Solution Approach 2:
The switching unit dynamically controls which plates are in the optical path, allowing the system to adjust the total compensation amount by changing the number of active plates. This dynamic approach provides fine-grained control over compensation accuracy while reducing the effective number of plates needed in any given configuration
3Productivity
If plates are arranged to compensate for negative group delay dispersion, then excitation efficiency is maintained, but the total thickness of plates increases
Solution Approach 1:
The switching unit dynamically selects and positions plates based on the wavelength of incident light, allowing the system to optimize the total plate thickness for each wavelength range. By having plates that can be selectively activated rather than all plates being permanently in place, the system maintains excitation efficiency while minimizing the effective path length through the compensator
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
The compensator reduces the number and total thickness of plates required, ensuring appropriate compensation for various excitation pulse wavelengths, thereby maintaining excitation efficiency in three-photon microscopes.
Implementation Method 1
the pulse width may broaden due to group delay dispersion, potentially leading to a reduction in excitation efficiency
Data Source
AI summary
A compensator that compensates for negative group delay dispersion of pulsed light irradiated onto a sample via an optical system, the negative group delay dispersion being caused to occur by the optical system. The compensator includes a plurality of plates that generate positive group delay dispersion, and a switching unit that can switch each plate between a first state where the plate is arranged in a position through which the pulsed light passes and a second state where the plate is arranged in a position through which the pulsed light does not pass, and can set a predetermined combination of the plurality of plates to the first state according to a wavelength of the pulsed light.