Electrodeless Laser-Driven Light Source Using Pulsed-CW Plasma Ignition
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Solution Overview
Problem
Existing high-brightness light sources with electrode-based ignition face limitations such as reduced lamp lifetime, thermal, mechanical, and electrical stress, and design constraints that restrict bulb size and shape, leading to noise and limited performance.
Innovation Solution
A laser-driven light source with electrodeless ignition, where a gas-filled bulb is excited using pulsed and continuous wave laser light, eliminating the need for electrodes and allowing for higher fill pressures, smaller bulb sizes, and reduced complexity, with precise control over energy delivery to ignite and sustain plasma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode-based ignition is used in high-brightness light sources, then plasma can be ignited and sustained, but lamp lifetime is reduced and thermal, mechanical, and electrical stress increase
Solution Approach 1:
The patent removes electrodes from the light source system entirely, replacing electrode-based plasma ignition with direct laser-induced plasma generation. This extraction of the electrode component eliminates the source of thermal, mechanical, and electrical stress that previously limited lamp lifetime and reliability.
Solution Approach 2:
The patent replaces the mechanical/electrical electrode-based ignition system with an optical laser-based system. Instead of using physical electrodes to initiate plasma, the invention uses focused laser energy to directly create and sustain plasma in the gas-filled bulb, eliminating mechanical wear and electrical contact issues.
2Adaptability or versatility
If electrodes are used for plasma ignition, then plasma can be sustained, but design constraints restrict bulb size and shape
Solution Approach 1:
By removing electrodes from the system, the patent eliminates all design constraints related to electrode placement, sealing, and configuration. This allows the bulb to be designed purely based on optical and gas-filled requirements, enabling greater flexibility in size, shape, and geometry optimization for specific applications.
Solution Approach 2:
The invention separates the plasma ignition function from the structural bulb design. Instead of integrating electrodes into the bulb structure, the laser system provides external ignition capability, allowing the bulb to be a simple sealed container optimized for its specific application without compromising structural integrity for electrode accommodation.
3Reliability
If electrodes are used for ignition, then plasma can be generated, but noise increases and performance is limited
Solution Approach 1:
The patent replaces the noisy mechanical and electrical electrode discharge system with a quiet optical laser system. Laser-induced plasma generation produces no mechanical vibration, electrical arcing, or contact noise, resulting in significantly reduced operational noise and improved performance stability.
Solution Approach 2:
The invention converts the potential harm of electrode wear, contamination, and instability into a benefit by using laser energy that cleanly ionizes the gas without physical contact. The laser provides precise, controllable energy delivery that eliminates the harmful effects of electrode degradation while maintaining stable plasma generation.
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 approach results in improved reliability, reduced cost and complexity, higher brightness, and fewer geometry limitations, enabling smaller lamp heads with higher fill pressures and stable plasma operation, while avoiding electrode-related issues.
Implementation Method 1
a plasma breakdown region is formed in the bulb by projecting pulsed laser light into the bulb
Implementation Method 2
plasma emission is produced by projecting continuous wave (CW) laser light into a plasma breakdown region
Data Source
AI summary
An electrodeless laser-driven light source includes a laser that generates a CW sustaining light. A pump laser generates pump light. A Q-switched laser crystal receives the pump light generated by the pump laser and generates pulsed laser light at an output in response to the generated pump light. A first optical element projects the pulsed laser light along a first axis to a breakdown region in a gas-filled bulb comprising an ionizing gas. A second optical element projects the CW sustaining light along a second axis to a CW plasma region in the gas-filled bulb comprising the ionizing gas. A detector detects plasma light generated by a CW plasma and generates a detection signal at an output. A controller generates control signals that control the pump light to the Q-switched laser crystal so as to extinguish the pulsed laser light within a time delay after the detection signal exceeds a threshold level.