Laser-Driven Plasma Light Source Eliminating Electrode Wear
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Solution Overview
Problem
Current high brightness light sources, such as xenon or mercury arc lamps, suffer from wear issues, contamination, instability, and insufficient brightness, especially in the ultraviolet spectrum, due to electrical discharge and are affected by the chamber walls through which light passes.
Innovation Solution
A light source that uses a chamber with a laser to ionize a gas, providing energy to sustain a high brightness plasma, with optical elements to modify the laser energy and a reflective surface to compensate for refractive index effects, ensuring stable and high-intensity light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If arc lamps are used to produce light, then light emission is achieved, but the anode and cathode become very hot and wear out, emitting particles that contaminate the light source
Solution Approach 1:
The patent removes the electrodes (anode and cathode) from the light generation process entirely. Instead of using electrical discharge between electrodes to excite the gas, the invention uses direct laser excitation of the gas atoms. This extraction of the electrode component eliminates the wear and contamination problems while maintaining light emission capability.
Solution Approach 2:
The patent replaces the electrical discharge mechanism (involving physical electrodes) with a laser-based excitation mechanism. The laser provides energy to the gas atoms directly through photon absorption, substituting the mechanical/electrical electrode system with an optical field-based system that has no moving parts or consumable components.
2Illumination intensity
If arc lamps are used to produce light, then light emission is achieved, but the brightness is insufficient for some applications, especially in the ultraviolet spectrum
Solution Approach 1:
The patent changes the excitation parameters by using laser light at specific wavelengths that match the absorption lines of the gas atoms. By tuning the laser wavelength to resonate with atomic transitions, particularly in the ultraviolet range, the system achieves much higher brightness and spectral selectivity compared to broadband arc lamp emission.
3Illumination intensity
If the position of the arc is used to generate light, then light emission is achieved, but the position of the arc is unstable
Solution Approach 1:
The patent replaces the unstable electrical arc discharge with a stable laser beam. The laser provides a fixed, controllable energy source that can be precisely positioned and maintained, eliminating the inherent instability of arc discharge where the arc position fluctuates due to electrode wear, gas pressure changes, and electrical field variations.
4Illumination intensity
If light passes through the chamber wall to exit the light source, then light transmission is achieved, but the properties of light are significantly affected
Solution Approach 1:
The patent changes the operating parameters by generating light at specific wavelengths that match the transmission windows of the chamber wall material. By selecting gas species and laser excitation wavelengths that correspond to transmission peaks of materials like quartz or sapphire, the system minimizes absorption and distortion while maintaining high brightness output.
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 stable, high-brightness light source that minimizes wear and contamination, maintains consistent intensity, and effectively transmits light through chamber walls without significant distortion, addressing the limitations of existing technologies.
Implementation Method 1
an ignition source for ionizing a gas within the chamber
Implementation Method 2
at least one laser for providing energy to the ionized gas within the chamber to produce a high brightness light
Implementation Method 3
providing energy to sustain a high brightness plasma
Implementation Method 4
at least one optical element for modifying a property of the laser energy provided to the ionized gas
Implementation Method 5
The optical element can be, for example, a lens (e.g., an aplanatic lens, an achromatic lens, a single element lens, and a Fresnel lens)
Implementation Method 6
a reflective surface to compensate for refractive index effects
Implementation Method 7
ensuring stable and high-intensity light emission... effectively transmits light through chamber walls without significant distortion
Data Source
AI summary
An apparatus for producing light includes a chamber and an ignition source that ionizes a gas within the chamber. The apparatus also includes at least one laser that provides energy to the ionized gas within the chamber to produce a high brightness light. The laser can provide a substantially continuous amount of energy to the ionized gas to generate a substantially continuous high brightness light.