Laser Scanning Microscope Light-Level Control via Acousto-Optic Modulation
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Solution Overview
Problem
Existing laser microscopes struggle to finely adjust laser light intensity for fluorescence observation while maintaining high-intensity light stimulation using a single laser source, leading to difficulties in detailed observation at desired light intensities.
Innovation Solution
A laser scanning microscope apparatus with a light source, output-power control, and acousto-optic device that adjusts laser light levels in a step-wise manner, allowing for high-intensity light stimulation and low-intensity fluorescence observation using a single laser source, with an optical-axis correction mechanism to maintain precise intensity and prevent heat-related stabilization issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single laser light source is used for both light stimulation and fluorescence observation, then device complexity is reduced, but light intensity control precision deteriorates
Solution Approach 1:
The patent divides the laser light control into two independent control stages: output-power control for coarse adjustment and light-level control for fine adjustment. This segmentation allows each control mechanism to operate at its optimal resolution, with the light-level control portion providing fine-grained control at different stages of the laser path without requiring multiple laser sources.
Solution Approach 2:
The patent introduces a light-level control portion as an intermediary device between the laser light source and the specimen. This intermediary component (such as an acousto-optic modulator or variable neutral density filter) enables precise light intensity adjustment without affecting the laser source itself, thereby maintaining control precision while using a single laser source.
2Power
If high-intensity laser light is used for light stimulation, then stimulation effectiveness is improved, but fluorescence observation quality deteriorates due to excessive intensity
Solution Approach 1:
The patent implements dynamic light intensity adjustment by allowing the light-level control portion to modify laser intensity in real-time based on the operational mode. During light stimulation, high intensity is applied; during fluorescence observation, the system dynamically reduces intensity to appropriate low levels, thereby preventing color fading while maintaining stimulation effectiveness when needed.
Solution Approach 2:
The system changes the light intensity parameter dynamically depending on the operational phase. The light-level control portion adjusts the intensity parameter to high values during light stimulation and to low values during fluorescence observation, enabling the same laser source to serve both functions optimally without causing harmful effects.
3Device complexity
If acousto-optic device setting resolution is constant across all intensities, then device complexity is reduced, but light level adjustment precision deteriorates at low intensities
Solution Approach 1:
The patent segments the control resolution requirements into two levels: coarse control through output-power settings and fine control through light-level adjustments. This segmentation allows the system to use a constant setting resolution in the acousto-optic device while achieving effective fine control at low intensities through the combined effect of both control stages.
Solution Approach 2:
The patent adds an additional control dimension by introducing the light-level control portion that operates independently from the output-power control. This extra dimension of control enables fine adjustment capability at low intensities without requiring the acousto-optic device itself to have variable resolution settings.
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 both high-intensity light stimulation and detailed low-intensity fluorescence observation using a single laser source, allowing for precise adjustment of light levels without heat-related stabilization issues, improving observation capabilities and extending laser source lifespan.
Implementation Method 1
an acousto-optic device like an AOTF (Acoust-Optic Tunable Filter), and the intensity of laser light is modulated by using the acousto-optic device
Implementation Method 2
a light source that generates laser light
Implementation Method 3
detects fluorescence generated in the specimen
Data Source
AI summary
Both light stimulation of a specimen at a high intensity and detailed fluorescence observation at a low intensity are realized by using a single laser light source. Provided is a laser scanning microscope apparatus (1) including a laser light source (11) that generates laser light; output-power control portion (13) that can set an output power of the laser light source (11) by changing the output power in a step-wise manner; an AOTF (15) that can adjust a light level of the laser light emitted from the laser light source (11) in a step-wise manner at a resolution that is finer than a resolution at which the output-power control portion (13) changes the output power of the laser light source (11); and an observation device (17) that scans the laser light whose light level has been adjusted by the AOTF (15) on a specimen and that detects fluorescence generated at the specimen.