Gas Laser Device Asymmetric Hybrid Planar Waveguide Resonator
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Solution Overview
Problem
Conventional asymmetric hybrid planar waveguide gas lasers require external correction systems to produce a diffraction-limited beam, which increases complexity, cost, and weight, and necessitates precise optical alignment to avoid thermal damage.
Innovation Solution
Incorporating an additional waveguide strip and an optical focusing system to form a beam waist in the free-space unstable direction, allowing for spatial filtering and eliminating the need for further external corrections, thereby simplifying the design and reducing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional external correction systems are used to produce diffraction-limited beams, then beam quality is improved, but device complexity increases
Solution Approach 1:
The patent combines the waveguide structure with the beam correction function by introducing an additional waveguide strip that acts as both a structural component and a beam shaping element. This merging eliminates the need for separate external correction optics, thereby reducing device complexity while maintaining beam quality.
Solution Approach 2:
The additional waveguide strip serves as an intermediary element between the resonator and the output, performing the beam correction function internally. This intermediary structure enables diffraction-limited beam production without requiring external correction systems.
2Manufacturing precision
If conventional external correction systems are used to produce diffraction-limited beams, then beam quality is improved, but device weight increases
Solution Approach 1:
By merging the beam correction function into the waveguide structure itself, the patent eliminates the need for heavy external correction optics. The waveguide strip performs the correction function using the existing structural material, thereby reducing overall device weight while maintaining beam quality.
3Manufacturing precision
If conventional external correction systems are used to produce diffraction-limited beams, then beam quality is improved, but alignment precision requirements increase
Solution Approach 1:
The integration of beam correction into the waveguide structure eliminates separate alignment interfaces. The waveguide strip is inherently aligned with the resonator, removing the need for precise alignment of external correction optics and thereby reducing alignment precision requirements.
4Manufacturing precision
If beam propagation distance is increased to achieve far-field conditions, then beam profile is improved, but device length increases
Solution Approach 1:
The additional waveguide strip acts as an intermediary that creates far-field conditions internally within a compact structure. By performing the beam transformation function within the waveguide, the patent achieves the desired beam profile without requiring long external propagation distances.
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 enables the production of a near diffraction-limited round beam without additional external corrections, enhancing the laser's structural simplicity, reducing costs, and minimizing thermal damage risks.
Implementation Method 1
an optical focusing system whose output beam waist in the free-space unstable direction, formed at the exit of the additional waveguide strip
Implementation Method 2
an additional waveguide strip whose longitudinal axis is parallel to an optical axis of the resonator, this additional waveguide strip acting as a waveguide for the resonator beam
Implementation Method 3
first and second curved reflectors facing each other between the electrode plates
Data Source
Figure 1(a)
Figure 1(b)
Figure 1(c)
AI summary
A gas laser device is presented that produces a near diffraction limited round beam exiting the discharge vessel (272). Through the use of a simple focussing system, additional waveguide strip (232) and a spatial filter (242) in conjunction with the new asymmetric hybrid planar waveguide resonator, a round diffraction limited beam can be produced exiting the discharge vessel (272). Furthermore, a second and very similar design is presented that allows for spatial filtering to take place directly outside of the discharge vessel, thereby enabling filtering of the beam to be an added option.