Spectral Channel Splicer for High-Power Beam Combining
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Solution Overview
Problem
Current spectral beam combining techniques face limitations in efficiently combining multiple laser beams with different wavelengths to achieve high power and beam quality, as existing methods often result in reduced power output and beam quality due to nonlinear parasitic effects and limited spectral bandwidth.
Innovation Solution
The use of a spectral channel splicer and spectral beam combiner system, comprising a plurality of reflectors and a diffractive optical element, such as a diffraction grating, to redirect and overlap laser beams with different wavelengths, allowing for the combination of multiple beams into a single high-power beam with improved beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple laser beams with different wavelengths are combined using conventional spectral beam combining techniques, then power output increases, but beam quality deteriorates due to nonlinear parasitic effects
Solution Approach 1:
The system segments the spectral bandwidth into multiple distinct channels, each handled by dedicated optical components. The reflector array divides the combined beam into individual wavelength components, processes them separately through the spatial light modulator, and recombines them. This segmentation prevents nonlinear parasitic effects from degrading overall beam quality while maintaining high power output.
Solution Approach 2:
The patent changes the spatial distribution parameter of different wavelength components across the beam profile. By assigning different spectral channels to different radial positions or angular directions, the system enables independent control of each wavelength component's parameters (intensity, phase, direction) without interference from other channels, thus maintaining beam quality while combining high powers.
2Power
If conventional spectral beam combining methods are used, then power output increases, but spectral bandwidth is limited
Solution Approach 1:
The spatial light modulator serves multiple functions simultaneously: it acts as a wavefront corrector, a spectral router, and a beam combiner. This multi-functional component can handle arbitrary wavelength combinations and spectral configurations, enabling the system to adapt to different spectral bandwidth requirements while maintaining high power output capability.
Solution Approach 2:
The patent introduces an additional spatial dimension for spectral multiplexing by distributing different wavelengths across the beam's cross-sectional area or angular space. This dimensional separation allows independent manipulation of multiple spectral channels simultaneously, expanding the usable spectral bandwidth beyond the limitations of conventional single-dimensional combining methods.
3Power
If more laser beams are combined to increase power, then power output increases, but system complexity increases
Solution Approach 1:
The system merges the functions of spectral separation, spatial control, and beam recombination into a single integrated apparatus using the reflector array combined with the spatial light modulator. This consolidation allows an arbitrary number of wavelength components to be combined through one unified device rather than requiring separate components for each wavelength, thereby reducing overall system complexity while enabling high power output from multiple combined beams.
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 combination of multiple laser beams into a single high-intensity beam with enhanced beam quality, overcoming limitations of existing methods by increasing power output and reducing nonlinear parasitic effects, while allowing for wider spectral bandwidth and compact system design.
Implementation Method 1
The spectral beam combiner comprises a diffraction grating or other diffractive optical element such as a hologram. The spectral beam combiner is configured to direct the plurality of input beams towards the appropriate dispersion direction.
Implementation Method 2
The spectral channel splicer comprises a plurality of reflectors. Individual reflectors are positioned to receive respective channels of the plurality of channels. The reflectors are tilted along a second direction different than the first direction such that different reflectors are oriented in different azimuthal directions to receive respective laser beams from different azimuthal angles and direct said laser beams along an appropriate direction.
Data Source
AI summary
A spectral beam combining system includes a spectral channel splicer comprising a plurality of reflectors and a spectral beam combiner comprising a diffraction optical element such as a diffraction grating. This spectral beam combining system may facilitate combining an increased number of spectral channels thereby producing higher optical power of the combining beam system.