Fluorescence Guide Plate With Dichroic Mirror for Edge Light Concentration
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Solution Overview
Problem
Existing fluorescence guide plates for solar-pumped lasers are not efficient in collecting and concentrating fluorescence energy, leading to energy loss and reduced laser oscillation efficiency.
Innovation Solution
A fluorescence guide plate with a dichroic mirror laminated on its receiving surface, where the reflection wavelength band of the dichroic mirror is set to lie in a range of wavelengths longer than the peak wavelength of the fluorescence wavelength band, allowing for efficient trapping and concentration of fluorescence energy at the edge surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional fluorescence guide plate without a dichroic mirror is used, then the structure is simple, but the fluorescence energy collection and concentration efficiency is insufficient
Solution Approach 1:
A dichroic mirror is introduced as an intermediary component on the incident light side of the fluorescence guide plate. This mirror selectively reflects fluorescence wavelengths while transmitting pump light wavelengths, acting as a mediator to redirect fluorescence toward the edge surface for efficient collection by the optical fiber, thereby resolving the contradiction between structural simplicity and collection efficiency.
Solution Approach 2:
The dichroic mirror is applied locally only on the incident light side surface of the fluorescence guide plate, rather than modifying the entire structure. This localized modification enables selective wavelength control (reflecting fluorescence, transmitting pump light) without complicating the overall structure, thus improving fluorescence collection efficiency while maintaining ease of manufacture.
2Loss of energy
If the dichroic mirror reflection wavelength band is set to cover the fluorescence wavelength band, then fluorescence energy concentration is improved, but pump light transmission may be affected
Solution Approach 1:
The dichroic mirror's reflection wavelength band is precisely controlled to start from a wavelength longer than the peak fluorescence wavelength. This parameter setting ensures that the mirror reflects fluorescence wavelengths effectively (reducing energy loss) while allowing shorter wavelength pump light to pass through, thus resolving the contradiction between fluorescence energy concentration and pump light transmission capability.
3Device complexity
If no dichroic mirror is used, then the device complexity is low, but the laser oscillation efficiency is reduced due to energy loss
Solution Approach 1:
The dichroic mirror serves as a mediator that redirects fluorescence toward the edge surface where the optical fiber is positioned, ensuring efficient coupling of fluorescence energy into the laser medium. This intermediary component significantly improves laser oscillation efficiency without adding substantial device complexity, as it is a single thin-film layer on the plate surface.
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 proposed solution enhances the efficiency of fluorescence energy collection and concentration, leading to easier laser oscillation and increased energy extraction as laser light, while reducing energy loss.
Implementation Method 1
a reflection wavelength band of a normal incident beam reflected by the dichroic mirror lies in a range of wavelengths longer than a peak wavelength of a fluorescence wavelength band of the fluorescent material
Implementation Method 2
Fluorescent material that absorbs irradiation light applied to the first surface to emit fluorescence
Implementation Method 3
The fluorescence guide plate has a plate-shaped structure made of a material with a higher refractive index than an outside. The fluorescence guide plate is configured such that, when the irradiation light enters from the first surface, the fluorescence emitted from the fluorescent material exits from the edge surface.
Data Source
AI summary
A fluorescence guide plate includes first and second surfaces, an edge surface connecting a periphery of the first surface with a periphery of the second surface, and a dichroic mirror laminated on the first surface. Fluorescent material is dispersed at least one of inside a space defined by the first surface, the second surface, and the edge surface, on the first surface, or on the second surface. The fluorescence guide plate has a plate-shaped structure made of a material with a higher refractive index than an outside. The fluorescence guide plate is configured such that, when irradiation light enters from the first surface, the fluorescence emitted from the fluorescent material exits from the edge surface. A reflection wavelength band of a normal incident beam reflected by the dichroic mirror lies in a range of wavelengths longer than a peak wavelength of a fluorescence wavelength band of the fluorescent material.