Programmable Multiple-Point Illuminator for Fast Confocal Scanning
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Solution Overview
Problem
Existing confocal microscopes face limitations in scanning speed and flexibility, with single-point microscopes being slow and multi-point microscopes being inflexible and optically inefficient, leading to reduced resolution and increased phototoxicity.
Innovation Solution
A programmable multiple-point illuminator using spatial light modulators with acousto-optic deflectors and arbitrary waveform generators to create arbitrary light patterns, enabling fast and flexible scanning across a sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-point scanning is used, then high resolution and high contrast are achieved, but image acquisition speed becomes slow
Solution Approach 1:
The invention divides the single laser beam into multiple parallel beamlets using a spatial light modulator, creating multiple illumination points that scan the sample simultaneously. This segmentation allows parallel acquisition of multiple pixels per frame, dramatically increasing image acquisition speed while maintaining the resolution benefits of confocal scanning.
Solution Approach 2:
The invention transitions from one-dimensional single-point scanning to two-dimensional multi-point parallel scanning by introducing a spatial light modulator that controls the position and shape of the illumination beam in the lateral dimension, enabling simultaneous scanning of multiple locations across the sample.
2Productivity
If scanning speed is increased with single laser spot, then faster imaging is achieved, but fluorophore saturation occurs
Solution Approach 1:
By dividing the total laser power into multiple parallel beamlets, each beamlet delivers reduced power to the sample compared to a single spot. This segmentation distributes the phototoxicity load across multiple lower-intensity illumination points, enabling faster scanning without saturating fluorophores or causing excessive photodamage.
3Productivity
If multi-point scanning with spinning disk is used, then fast scanning is achieved, but system flexibility and optical efficiency are reduced
Solution Approach 1:
The invention replaces the mechanical spinning disk system with a programmable spatial light modulator that uses electronic control to generate and position multiple beamlets. This substitution eliminates mechanical moving parts, enabling arbitrary scanning patterns, region-of-interest imaging, and dynamic adaptation to different sample types and objectives without mechanical constraints.
Solution Approach 2:
The spatial light modulator provides dynamic, programmable control over beamlet positions, shapes, and intensities, allowing the system to adapt scanning patterns in real-time based on sample characteristics, region of interest, and experimental requirements, unlike the fixed geometry of spinning disk systems.
4Productivity
If multi-point scanning with spinning disk is used, then fast scanning is achieved, but optical efficiency becomes low
Solution Approach 1:
By replacing the spinning disk with a spatial light modulator, the system eliminates the inherent optical losses associated with mechanical apertures and disk geometry. The programmable beam shaping and positioning enable more efficient coupling of laser light to the sample, improving optical efficiency while maintaining fast scanning capabilities.
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 high-resolution, high-contrast imaging with improved scanning speed and reduced phototoxicity, bridging the gap between single-point and multi-point microscopy.
Implementation Method 1
The SLM comprises a first acousto-optic deflector (AOD) and a second acousto-optic deflector
Implementation Method 2
an arbitrary waveform generator (AWG) that is configured to synthesize radiofrequency (RF) signals
Implementation Method 3
the sample being normally provided with fluorophores... that respond to an illumination laser by emitting light at a longer wavelength (Stokes shift)
Data Source
Figure 1
Figure 2A~2B
Figure 3A~4
AI summary
A programmable multiple-point illuminator for an optical microscope (M) comprises a light source (1, 2)and a spatial light modulator (SLM) to modulate a light beam from the light source. The modulated light beam is intended to scan across a sample placed under the microscope objective (21), the sample being provided with fluorophores. The SLM comprises a first acousto-optic deflector (8) and a second acousto-optic deflector (9), the first acousto-optic deflector having a first modulation plane (81) and the second acousto- optic deflector having a second modulation plane (91), said two acousto-optic deflectors being arranged in cascade to provide respective deflection in different directions, whereby the SLM is enabled to scan in two dimensions across the sample. The SLM further comprises a telescope relay (10) to conjugate the first modulation plane with the second modulation plane. The illuminator also comprises an arbitrary waveform generator (13) that is configured to synthesize holograms, and is arranged to simultaneously inject a first such hologram into the first acousto-optic deflector and a second such hologram into the second acousto-optic deflector, in order for the SLM to modulate the light beam in response to said holograms.