Self-Seeding High Power Laser Adaptive Optics Beam Quality
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Solution Overview
Problem
High-power laser systems face challenges in achieving near diffraction-limited beam quality due to thermal stress and power handling limitations, particularly at multi-kilowatt power levels, leading to beam degradation and increased complexity and cost.
Innovation Solution
A self-seeding high power laser configuration with a ring geometry and adaptive optics located between the output coupler and the amplifier, eliminating the need for an external master oscillator, reduces intra-cavity intensity and complexity by using a single high gain amplifier with a high output coupling ratio and adaptive optics in the low power leg to correct distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high power adaptive optics are used to correct beam distortions at multi-kilowatt power levels, then beam quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a low power beam sample as an intermediary to carry wavefront distortion information from the high power beam. This low power sample passes through the same optical path and experiences identical distortions, allowing wavefront sensing without exposing sensors to high power damage. The intermediary enables indirect measurement that solves the contradiction between needing high power correction and avoiding high power damage to sensing components.
Solution Approach 2:
The patent segments the high power beam into two paths: a main high power beam for useful work and a low power sample beam for wavefront sensing. This segmentation allows the sensing function to operate at low power while the main beam operates at high power, resolving the contradiction by separating the measurement function from the high power environment.
2Manufacturing precision
If intra-cavity adaptive optics are placed in the high power beam path, then beam distortion correction is improved, but power handling requirements and device complexity increase
Solution Approach 1:
The low power sample beam acts as an intermediary that experiences the same optical path distortions as the high power beam but allows wavefront sensing at low power levels. This eliminates the need for high power adaptive optics in the beam path, as the correction can be applied based on low power measurements.
Solution Approach 2:
The patent creates a copy of the high power beam's optical path experience using a low power sample. This copy undergoes identical distortions through the same optics and medium, allowing the wavefront information to be measured without requiring the sensing equipment to handle high power.
3Power
If multiple parallel amplifiers are used to achieve high power output, then power output is improved, but beam combination complexity and device complexity increase
Solution Approach 1:
The patent merges the functions of wavefront sensing and beam sampling into a single low power beam path that travels through the same optical system as the high power beam. This unified approach eliminates the need for separate sensing systems for each amplifier, reducing the complexity of combining multiple parallel systems.
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 configuration achieves a near diffraction-limited beam quality with reduced cost, size, and complexity, enabling more robust and efficient high power laser operation without the need for high power adaptive optics, suitable for high power applications.
Implementation Method 1
an adaptive optic optically coupled to the output of the optical relay for adaptively modifying a phasefront of the low power un-distorted optical beam; a high power amplifier optically coupled to an output of the adaptive optic phase control element for generating a high power un-distorted optical beam, wherein the adaptively modified phasefront injected by the adaptive optic cancels distortions produced by the high power amplifier
Implementation Method 2
The beam from the output coupler is spatially filtered to produce a low power un-distorted beam
Implementation Method 3
a high power amplifier optically coupled to an output of the adaptive optic phase control element for generating a high power un-distorted optical beam
Data Source
AI summary
A self-seeding high power laser includes a spatial filter; an optical relay for circulating a low power un-distorted optical beam, an adaptive optic optically coupled to the output of the optical relay; a high power amplifier optically coupled to an output of the adaptive optic phase control element, wherein adaptively modified phasefront injected by the adaptive optic cancels distortions produced by the high power amplifier; a beamsplitter optically coupled to the high power amplifier for splitting the high power un-distorted optical beam into a high power output beam as the output of the self-seeding high power laser, and a low power beam; a focusing lens; a detector for detecting a metric of the low power beam; and a controller for adaptively controlling the adaptive optic to maximize the power of the high power amplifier, based on the detected metric.