Diode Laser Optical Feedback for Stable Plasma Light Output
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Solution Overview
Problem
Existing high-brightness laser-driven light sources face challenges in generating stable, high-power light with enhanced spatial and spectral stability, particularly in broad-area laser emitters, which suffer from mode hopping and instability due to multiple spatial and longitudinal modes, limiting their utility for stable plasma applications.
Innovation Solution
Implementing optical feedback schemes using micro-optical elements such as fiber Bragg gratings and stamped aluminum mirrors to stabilize the spatial and spectral properties of broad-area laser emitters, without significant changes in size, weight, or power requirements, by selecting desired spatial modes and wavelengths, and combining beams to improve beam quality and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If broad-area laser emitters are used to generate high-power light, then power output is improved, but spatial and spectral stability deteriorates due to mode hopping
Solution Approach 1:
The patent implements optical feedback schemes using micro-optical elements (fiber Bragg gratings and stamped aluminum mirrors) to provide feedback to the broad-area laser emitters. This feedback stabilizes the spatial and spectral properties by selecting desired modes and wavelengths, thereby resolving the mode hopping issue while maintaining high power output
Solution Approach 2:
The patent introduces micro-optical elements as intermediary components between the laser emitter and the external environment. These elements (fiber Bragg gratings and stamped aluminum mirrors) act as mediators that selectively reflect and transmit specific wavelengths and spatial modes, stabilizing the laser output without requiring significant changes to the laser source itself
2Stability of the object's composition
If optical feedback schemes are implemented to stabilize laser properties, then spatial and spectral stability is improved, but device complexity increases
Solution Approach 1:
The patent employs relatively simple and inexpensive micro-optical elements (fiber Bragg gratings and stamped aluminum mirrors) that can be easily manufactured and integrated. These components provide effective stabilization without introducing significant complexity, representing a cost-effective solution to the stability problem
Solution Approach 2:
The optical feedback system is segmented into distinct functional components: fiber Bragg gratings for spectral selection and stamped aluminum mirrors for spatial mode selection. This segmentation allows each component to perform a specific function independently, simplifying the overall system design and making it easier to implement and maintain
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 optical feedback systems enhance the stability and brightness of laser-driven light sources, providing consistent spectral and spatial properties over time, improving the efficiency and reliability of plasma light output, and maintaining stability under thermal changes.
Implementation Method 1
The reflection region can be a fiber Bragg grating, a grating mirror, or a stamped aluminum mirror. The wavelength can be at a center wavelength of a fiber Bragg grating.
Implementation Method 2
The optical element includes a region that passes a portion of the CW laser beam to the output of the laser source and a reflection region that reflects another portion of the CW laser beam back to the output of the diode laser.
Implementation Method 3
a laser source that generates continuous wave sustaining light includes a diode laser that generates a CW laser beam
Data Source
AI summary
A laser-driven light source includes a laser source that generates continuous wave sustaining light includes a diode laser that generates a CW laser beam at an output and an optical element optically coupled to the output of the diode laser. The optical element includes a region that passes a portion of the CW laser beam to the output of the laser source and a reflection region that reflects another portion of the CW laser beam back to the output of the diode laser. The reflection region is configured to select a spatial mode and wavelength of the laser beam generated by the diode laser, thereby generating the CW sustaining light with radiant flux and spectral shape that is stable as a function of time. A gas-filled bulb optically coupled to the output of the laser source such that the generated CW sustaining light sustains a CW plasma in the gas-filled bulb, thereby emitting light with radiant flux and spectral shape stable as a function of time.