STED Microscope Beam Alignment via Dichroic Prism Adjustment
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Solution Overview
Problem
In stimulated emission depletion (STED) microscopy, the precise coincidence of excitation and depletion light spots is challenging due to environmental vibrations and mechanical stress, leading to reduced or lost super-resolution imaging capabilities.
Innovation Solution
A STED super-resolution microscope with a beam combination test unit that adjusts the angles of reflection and dichroic mirrors to accurately align the excitation and depletion light beams, utilizing a dichroic prism and area detectors to achieve precise coincidence, ensuring high-precision beam combination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the excitation light and depletion light are combined using conventional optical paths, then the system structure is simple, but the beam alignment precision deteriorates due to environmental vibrations and mechanical stress
Solution Approach 1:
The optical system is divided into separate excitation and depletion light paths that are independently adjustable. The excitation light path includes its own reflection mirrors and the depletion light path includes its own reflection mirrors, allowing independent alignment adjustment for each beam without affecting the other, thereby achieving high precision beam combination despite environmental disturbances.
2Reliability
If the microscope system is exposed to environmental vibrations and temperature changes, then the system remains simple, but the beam combination stability deteriorates causing spot drift
Solution Approach 1:
The system employs alignment adjustment mechanisms with adjustable reflection mirrors that can be tuned to compensate for spot drift caused by environmental factors. The mirrors are positioned and angled to allow real-time correction of beam alignment, providing feedback-based stabilization against vibrations and temperature changes.
3Measurement precision
If the light spots of excitation and depletion beams are required to accurately coincide, then the imaging resolution is high, but the alignment difficulty increases due to multiple adjustment parameters
Solution Approach 1:
The alignment adjustment mechanism provides localized control over each beam's path through individually adjustable reflection mirrors. Each mirror can be independently tuned to optimize its specific beam's alignment, allowing precise local adjustments rather than requiring global system reconfiguration, thereby simplifying the alignment process while maintaining high spot coincidence accuracy.
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 microscope achieves quick and accurate alignment of light beams, maintaining high super-resolution imaging capabilities and overcoming issues related to environmental disturbances.
Implementation Method 1
The excitation light beam transmitted through the first dichroic mirror and the depletion light beam reflected by the first dichroic mirror form a combined light beam
Implementation Method 2
The light beam that has been accurately coincided enters the λ/4 slide where the polarization state of the light beam is adjusted by the λ/4 slide
Implementation Method 3
The light beam emitted from the tube lens is transmitted into the objective lens through the second dichroic mirror, and is focused on the sample by the objective lens. The fluorescence emitted by the sample is collected by the objective lens
Implementation Method 4
The transmitted fluorescence enters the first lens, and is focused by the first lens on the pinhole provided at the focal position of the first lens. The light beam exiting from the pinhole enters the point detector
Data Source
AI summary
A STED super-resolution microscope capable of quick beam combination is disclosed, which includes a STED imaging unit and a beam combination test unit. The excitation light and the depletion light are accurately combined by the beam combination test unit, so that the imaging light spots of the two light beams passing through the STED imaging unit can accurately coincide with each other, thereby obtaining a better super-resolution imaging effect.