Microcrystalline Glass Beam Coherence Eliminating Element
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Solution Overview
Problem
Current methods for eliminating laser speckle, such as rotating phase plates and optical fiber modulation, are complex, costly, and reduce beam transmission efficiency, while existing decoherence technologies using microcrystalline glass are cumbersome and inefficient.
Innovation Solution
A beam coherence eliminating element using microcrystalline glass with a crystal phase and glass phase, where the crystal phase particles are randomly distributed to alter the laser beam phase without changing the beam direction, thereby eliminating coherence, utilizing a simple and efficient manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rotating phase plate method or optical fiber modulation is used to eliminate laser speckle, then laser coherence is reduced, but device complexity and cost increase
Solution Approach 1:
The patent changes the physical state and structural parameters of the optical medium by introducing microcrystalline phases with specific size ranges (0.1-1000 nm) and distributions within the glass matrix. This creates random optical path differences that reduce laser coherence and eliminate speckle without requiring complex mechanical or optical components
Solution Approach 2:
The patent uses composite microcrystalline glass materials consisting of a glass phase and microcrystalline phases distributed within it. This composite structure provides both the randomness needed for speckle reduction and the optical transparency required for efficient beam transmission, eliminating the need for complex mechanical decoherence devices
2Object-affected harmful factors
If emulsified microcrystalline glass balls are used to eliminate laser coherence, then laser speckle is reduced, but beam transmission efficiency decreases
Solution Approach 1:
The patent applies local quality changes by introducing microcrystalline phases only in specific regions within the optical medium, with controlled size distributions (0.1-1000 nm). These localized crystalline regions create the necessary optical path variations for speckle reduction while the surrounding glass matrix maintains high transparency and transmission efficiency
Solution Approach 2:
The patent optimizes the size parameter of microcrystalline phases to be within 0.1-1000 nm, which is small enough to minimize scattering losses and maintain beam transmission efficiency, yet large enough to create sufficient optical path differences for effective coherence reduction and speckle elimination
3Object-affected harmful factors
If emulsified microcrystalline glass balls are used to eliminate laser coherence, then laser speckle is reduced, but device structure becomes complicated
Solution Approach 1:
The patent merges the functions of multiple separate components (decoherence element and optical transmission medium) into a single integrated microcrystalline glass component. The microcrystalline glass itself serves as both the optical medium for beam transmission and the decoherence element for speckle reduction, eliminating the need for additional optical elements like ellipsoidal reflectors, reflectors, and collimating lenses
Solution Approach 2:
The patent uses composite microcrystalline glass materials that inherently provide both optical transparency for efficient beam transmission and random optical path differences for speckle reduction. This single composite material replaces complex multi-component device structures, achieving both decoherence and maintained beam direction without additional optical elements
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 solution provides a simple, cost-effective, and high-efficiency method to eliminate laser speckle, maintaining beam transmission direction and improving image quality in laser projection systems.
Implementation Method 1
the crystals in the microcrystalline glass can randomly change beam phase without changing the overall transmission direction of the beams, thereby avoiding interference of the beams, i.e., eliminating the beam coherence
Implementation Method 2
the crystal phase and glass phase in the microcrystalline glass have different refractive indices of light beam
Data Source
AI summary
Disclosed in the present invention is a beam coherence eliminating element. The optical medium material of the element comprises microcrystalline glass, wherein microcrystalline particles therein have a size of 0.1-1000 nm and are distributed randomly. As the crystals in the microcrystalline glass can change the phase of light beams, the microcrystalline glass can change the phase of the light beams randomly, thereby eliminating the coherence of the beams. The crystal size of the microcrystalline glass is small, and thus does not affect the transmission efficiency of light beams. The element of the present invention has a simple structure and is convenient to use, and can be added in the process of beam transmission to easily eliminate beam coherence.