Beam Splitter Layout for Overlapping Illumination and Detection Bands
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Solution Overview
Problem
Existing multimodal microscopes face challenges in efficiently separating illumination and detection light due to spectral overlap, particularly when combining methods like SRS with wavelength-dependent and polarization-dependent light separation, leading to significant loss of detection light.
Innovation Solution
A beam splitter with unique splitting characteristics that combines wavelength-dependent and polarization-dependent light separation, allowing for high light efficiency by using a beam splitter with three distinct splitting characteristics across different wavelength bands, including a polarization-dependent splitting edge adapted to the intermediate wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dichroic beam splitter is used to separate illumination light and detection light in fluorescence microscopy, then wavelength-dependent light separation is achieved, but polarization-dependent separation methods like SRS cannot be effectively combined
Solution Approach 1:
The beam splitter is designed to perform multiple functions: it acts as a dichroic beam splitter for wavelength-dependent separation in fluorescence microscopy modes, and as a polarizing beam splitter for polarization-dependent separation in SRS mode. This multi-functionality enables the combination of different microscopic methods without requiring separate optical components for each mode.
Solution Approach 2:
The beam splitter's splitting characteristics are dynamically adjusted based on the operating mode. In the intermediate wavelength range, the beam splitter exhibits polarization-dependent splitting characteristics, while in other wavelength ranges it exhibits wavelength-dependent splitting characteristics. This dynamic behavior allows the same component to adapt to different separation requirements.
2Adaptability or versatility
If a polarizing beam splitter is used to separate illumination light and detection light in SRS microscopy, then polarization-dependent light separation is achieved, but wavelength-dependent separation methods like multiphoton excitation microscopy cannot be effectively combined
Solution Approach 1:
The beam splitter is designed to perform multiple functions: it acts as a dichroic beam splitter for wavelength-dependent separation in fluorescence microscopy modes, and as a polarizing beam splitter for polarization-dependent separation in SRS mode. This multi-functionality enables the combination of different microscopic methods without requiring separate optical components for each mode.
Solution Approach 2:
The beam splitter's splitting characteristics are dynamically adjusted based on the operating mode. In the intermediate wavelength range, the beam splitter exhibits polarization-dependent splitting characteristics, while in other wavelength ranges it exhibits wavelength-dependent splitting characteristics. This dynamic behavior allows the same component to adapt to different separation requirements.
3Loss of energy
If conventional beam splitters are used to separate illumination and detection light in multimodal configuration, then light separation is achieved, but significant loss of detection light occurs
Solution Approach 1:
The beam splitter's splitting characteristics are dynamically adjusted based on the operating mode. In the intermediate wavelength range, the beam splitter exhibits polarization-dependent splitting characteristics, while in other wavelength ranges it exhibits wavelength-dependent splitting characteristics. This dynamic behavior allows the same component to adapt to different separation requirements.
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 efficient separation of illumination and detection light without significant loss, facilitating a multimodal configuration that can combine SRS with other methods like multiphoton excitation microscopy, CARS, SHG, and THG, ensuring almost all detection light is collected without loss.
Implementation Method 1
a polarization-dependent second splitting characteristic with the one of transmitting and reflecting light of the first polarization state and the other of transmitting and reflecting light of a second polarization state in the intermediate wavelength range
Implementation Method 2
a first splitting characteristic with one of transmitting and reflecting light of at least a first polarization state in the illumination wavelength range excluding the intermediate wavelength range
Data Source
AI summary
An optical apparatus for examining a sample includes: an illumination unit for emitting illumination light in an illumination wavelength range onto the sample; a detection unit for collecting detection light in a detection wavelength range from the sample, the illumination wavelength range and the detection wavelength range partially overlapping in an intermediate wavelength range; and a light separating device for separating the illumination light and the detection light, the light separating device including a beam splitter having: a first splitting characteristic with one of transmitting and reflecting light of at least a first polarization state in the illumination wavelength range excluding the intermediate wavelength range; and a polarization-dependent second splitting characteristic with the one of transmitting and reflecting light of the first polarization state and the other of transmitting and reflecting light of a second polarization state in the intermediate wavelength range.