Flat-Folded Ceramic Slab Laser Resonator Design
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Solution Overview
Problem
Conventional slab lasers face limitations in increasing power output without expanding the overall length of the laser body, which is costly and undesirable, especially when using ceramic materials.
Innovation Solution
A flat-folded ceramic slab laser design featuring three slab waveguide sections with ceramic walls that function as waveguides in one direction and exhibit free-space characteristics in another, along with a negative branch unstable resonator and strategically positioned electrodes to optimize energy excitation and output, allowing for increased power without lengthening the laser body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the slab waveguide is made longer to increase power output, then the power output increases, but the laser body length increases which is undesirable and expensive with ceramic bodies
Solution Approach 1:
The resonator is folded back on itself in a U-shape configuration, changing the spatial arrangement from a linear one-dimensional layout to a two-dimensional folded layout. This allows the optical path length to be extended while keeping the overall device footprint compact, effectively resolving the contradiction between increasing power output and maintaining compact dimensions.
Solution Approach 2:
The resonator path is folded back into itself, with the second slab waveguide section returning along a path that overlaps spatially with the first section. This nesting of the optical path allows the resonator to fit within a compact envelope while maintaining the required long interaction length for high power output.
2Power
If the slab waveguide is made wider to increase power output, then the power output increases, but the beam quality and physical structure constraints are compromised
Solution Approach 1:
The resonator is divided into multiple slab waveguide sections (first and second sections) arranged in a folded configuration. Each section maintains the optimal narrow width for good beam quality and waveguide characteristics, while the combined folded path provides the extended interaction length needed for high power output, thus segmenting the functions of beam quality maintenance and power generation.
Solution Approach 2:
Instead of increasing the width of individual waveguide sections to boost power output (which would degrade beam quality), the design extends the optical path length by folding the resonator in a different spatial dimension. This allows power scaling while maintaining the narrow waveguide geometry required for excellent beam quality.
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 design enhances power output by effectively folding the resonator, utilizing ceramic materials for efficient cooling and polarization management, resulting in a more compact and efficient laser system with improved power coupling and reduced risk of mirror damage.
Implementation Method 1
Each of the first, second, and third slab waveguide sections may be partially bounded by ceramic walls of the ceramic body that extend parallel to the plane defined by the first, second, and third axes. The ceramic walls of the ceramic body that extend parallel to the plane defined by the first, second, and third axes may function as waveguides.
Implementation Method 2
Smaller transverse dimensions permit an increase in the diffusive cooling efficiency of a laser gas bounded by the waveguide by allowing efficient transportation of waste heat to the walls of the waveguide resonator.
Data Source
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AI summary
In at least one illustrative embodiment, a laser may include a ceramic body (12) defining a chamber containing a laser gas. The chamber may include first and second slab waveguide sections extending (14), (16) along parallel first and second axes and a third slab waveguide section (18) extending along a perpendicular third axis. Respective first ends of the first and second slab waveguide sections may be positioned adjacent opposite ends of the third slab waveguide section. The laser may also include first and second end mirrors (26), (28) positioned at respective second ends of the first and second slab waveguide sections, a first fold mirror (32) positioned near an intersection of the first and third axes at a 45-degree angle to both the first and third axes, and a second fold mirror (34) positioned near an intersection of the second and third axes at a 45-degree angle to both the second and third axes, such that the first, second, and third slab waveguide sections waveguide recirculating light that is polarized orthogonal to a plane defined by the first, second, and third axes (20), (22), (24).