Solarization-Resistant Beam Guidance Element for High-Power Laser Imaging
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Solution Overview
Problem
High thermal loads in laser projectors due to increasing luminous fluxes and power densities lead to solarization effects in optical components, compromising projection quality and long-term stability, which is also a concern in material processing applications.
Innovation Solution
The use of a beam guidance element made of glass with a specific quality factor F(436 nm) = S(436 nm) * (Ext0(436 nm) + Ext1(436 nm)) / k, where S is thermality, Ext0 is initial absorbance, Ext1 is additional absorbance after irradiation, and k is thermal conductivity, ensuring high solarization resistance and reduced thermal lens effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser light sources with increasing luminous fluxes and power densities are used, then the brightness and performance of projectors are improved, but thermal load on optical components increases causing solarization effects and compromising long-term stability
Solution Approach 1:
The patent changes the material parameter of the beam guidance element by using glass with specifically optimized optical properties (high transmission in visible range, low absorption losses, high solarization resistance) to withstand the increased thermal load from high-power laser sources while maintaining projection quality and stability
Solution Approach 2:
The patent employs composite optical systems combining multiple glass types with complementary properties - including fluorophosphate glass, silicate glass, and borosilicate glass - each selected for specific characteristics such as low absorption in blue spectral range, high transmission, and resistance to solarization effects under high power density
2Ease of manufacture
If traditional optical glasses are used in beam guidance elements, then manufacturing is easier and cost is lower, but absorption losses increase and solarization resistance is insufficient under high power densities
Solution Approach 1:
The patent optimizes the optical parameters of glass materials by selecting compositions with specifically tailored absorption characteristics - using fluorophosphate and silicate glass systems that exhibit minimal absorption in the blue spectral range (400-480 nm) and high transmission across the visible spectrum, thereby reducing energy losses in high-power laser projection systems
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
This solution significantly reduces unwanted aberrations and thermal lens effects, enhancing the stability and quality of imaging systems under high power densities, particularly in projectors and material processing.
Implementation Method 1
Any light absorption within the arrangement of prisms leads to temperature gradients and thermal lens effects
Implementation Method 2
Absorption-induced generation of defect centers in the prism glass may result in a reduction of the transmission which in turn is concomitant with thermal lens effects
Data Source
AI summary
An imaging system includes at least one laser light source having a wavelength in the visible spectral range and a beam guidance element with high solarization resistance at high beam power densities. The invention also relates to the use of the imaging system, in particularly in projectors and in material processing.