Polarization Interlacing for High Power Laser Beam Combining
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Solution Overview
Problem
Current high power laser technologies face challenges such as thermal issues, non-linear effects, and stringent beam property requirements, limiting their ability to generate high power laser signals effectively, especially at long range.
Innovation Solution
The method of time division multiplexed beam combination using polarization interlacing, where pulsed laser signals are combined by altering the optical path through mechanical means or active polarization elements, allowing for scalable combination of multiple lasers without coherency or wavelength requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If monolithic high power lasers are developed, then output power increases, but thermal issues and non-linear effects worsen
Solution Approach 1:
The invention divides the high power laser system into multiple separate laser sources, each operating at lower power levels. These individual lasers are then combined through polarization interlacing to achieve the desired high output power. This segmentation allows each laser to operate below thermal management thresholds while collectively producing high power output.
Solution Approach 2:
The invention merges multiple separate laser beams using polarization interlacing and beam combining optics. By alternately combining beams with orthogonal polarizations, the system achieves high power output equivalent to monolithic lasers while avoiding thermal issues through the distributed architecture of multiple lower-power sources.
2Power
If monolithic high power lasers are developed, then output power increases, but non-linear effects worsen
Solution Approach 1:
The invention segments the high power generation into multiple lower-power laser sources. Each individual laser operates in a regime where non-linear effects are minimal, and the combined output achieves high power without the harmful non-linear effects that would occur in a single high-power laser.
3Reliability
If coherent beam combining is used, then a single diffraction limited beam is produced, but fill factor requirements become extremely stringent
Solution Approach 1:
The invention changes the combining approach from coherent beam combining to polarization-based time-division multiplexed combining. This parameter change in the combining mechanism relaxes the fill factor requirements while maintaining diffraction-limited beam quality, as the combination occurs in the polarization domain rather than requiring precise spatial overlap.
4Power
If wavelength division multiplexing is used, then multiple lasers can be combined, but beam combiner losses increase and the system becomes delicate
Solution Approach 1:
The invention replaces the wavelength-division multiplexing approach with polarization-based combining. This substitution eliminates the need for delicate wavelength-selective beam combiners and their associated losses, using instead polarization optics that are more robust and have lower insertion losses.
5Power
If geometric overlap techniques are used, then very high powers are produced, but the resultant beams are not suitable for directing energy at range
Solution Approach 1:
The invention uses dynamic time-division multiplexed polarization interlacing to combine beams, where the polarization state and optical path are dynamically adjusted based on which laser is active. This dynamic approach ensures that only one beam occupies the optical path at a time, maintaining diffraction-limited quality suitable for long-range energy direction while achieving high power through temporal combining.
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 enables the generation of high power laser signals that can be directed effectively at range, overcoming thermal and non-linear issues, and achieving powers comparable to or exceeding those of single optimized lasers, while maintaining a diffraction-limited beam.
Implementation Method 1
pulsed laser signals are combined by altering the optical path through mechanical means or active polarization elements
Data Source
AI summary
The present invention is a time division multiplexed beam combination for laser signal generation. In one aspect, the time division multiplexed beam combination employs a mechanical implementation. In a second aspect, the time division multiplexed beam combination employ a polarization interlacing.