Wavelength Beam Combining Resonator Alignment Using Beam Profiling
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Solution Overview
Problem
Existing WBC laser systems face challenges in optimizing the alignment of multiple beam emitters, particularly in the non-WBC dimension, which affects the resonator's power and stability.
Innovation Solution
The system employs a beam profiling technique to de-multiplex the resonator beam, generating near-field and far-field images to detect beam decentering and pointing errors. Optical elements like interleaver mirrors and SAC lenses can be adjusted to align individual beams, enabling simultaneous alignment of multiple emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional alignment methods are used for WBC laser systems, then the alignment process is simple, but the alignment precision in the non-WBC dimension is poor, affecting resonator power and stability
Solution Approach 1:
The patent segments the alignment measurement process by separately measuring near-field and far-field beam profiles. The near-field measurement captures beam position at the resonator output, while the far-field measurement captures beam propagation characteristics. This segmentation allows independent optimization of each measurement plane, improving overall alignment precision without requiring a single complex measurement system.
Solution Approach 2:
The patent introduces a beam profiler as an intermediary device that captures beam images at different planes. This intermediary tool enables indirect measurement of alignment parameters by analyzing beam profiles, which is more precise than direct alignment methods. The beam profiler acts as a mediator between the complex resonator system and the alignment adjustment process.
2Productivity
If beam alignment is optimized in the WBC dimension, then beam combining efficiency is improved, but misalignment in the non-WBC dimension remains undetected, affecting resonator stability
Solution Approach 1:
The patent extends the alignment measurement from the traditional WBC dimension to include the non-WBC dimension by capturing two-dimensional beam profiles. The beam profiler records beam positions in both transverse directions, allowing simultaneous optimization of alignment in both dimensions. This dimensional extension ensures that beam combining efficiency and resonator stability are both addressed.
Solution Approach 2:
The patent implements a feedback mechanism where beam profiler measurements provide real-time information about beam alignment in both WBC and non-WBC dimensions. This feedback is used to adjust optical elements to optimize both beam combining efficiency and resonator stability simultaneously, rather than optimizing one dimension at the expense of the other.
3Measurement precision
If multiple beam emitters are aligned individually, then alignment precision for each emitter is high, but the alignment process time is excessive
Solution Approach 1:
The patent merges the alignment measurement for multiple emitters into a single simultaneous measurement process. The beam profiler captures all beam profiles in one shot, allowing all emitters to be aligned together rather than sequentially. This merging maintains individual alignment precision while dramatically reducing the total alignment time.
Solution Approach 2:
The patent performs preliminary alignment by capturing near-field beam profiles first, which provide immediate feedback on beam positions. This preliminary measurement allows for quick coarse alignment of all emitters before fine-tuning, reducing the overall alignment process time while maintaining precision.
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 allows for efficient alignment of multi-emitter laser resonators, improving the beam quality and stability by reducing misalignment errors in both the WBC and non-WBC dimensions.
Implementation Method 1
a dispersive element receives the output beam and disperses the output beam to generate a plurality of dispersed beams in the WBC dimension
Implementation Method 2
the beam profiler receives the plurality of dispersed beams and generates images of relative positions of the dispersed beams received by the beam profiler
Implementation Method 3
The first lens has optical power in a non-WBC dimension perpendicular to the WBC dimension. The first lens is disposed optically downstream of the beam output and optically upstream of the beam profiler
Implementation Method 4
The second lens focuses the dispersed beams on or toward the beam profiler. The second lens has optical power in the WBC dimension
Data Source
AI summary
In various embodiments, alignment systems for laser resonators generate near-field and/or far-field images of input beams produced by the laser resonators to enable the alignment of the input beams.