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What is CBC?
(Coherent Beam Combining)
Coherent Beam Combining (CBC) is a laser beam combining technique that coherently merges the output of multiple individual lasers into a single, high-power beam while preserving near-diffraction-limited beam quality. Unlike spectral or incoherent beam combining, CBC relies on precisely controlling the optical phase of each laser so that all beams interfere constructively.
Its primary purpose is to overcome the power limitations of a single laser source while maintaining excellent brightness, beam quality, and pointing stability. As the demand for higher optical power continues to grow in industrial, scientific, and defense applications, CBC has emerged as one of the most promising scaling technologies for high-performance fiber laser systems. By distributing power generation across multiple amplifiers instead of relying on a single high-power laser, CBC improves thermal management, enhances system reliability, and enables power levels that would otherwise be difficult or impossible to achieve with conventional architectures.
HOW coherent beam combining Works
Coherent Beam Combining relies on active phase control to ensure that multiple laser beams behave as a single optical source. The process can be divided into three key steps.
Phase Synchronization
Each individual laser or fiber amplifier generates light with the same wavelength but an independent optical phase. Before combination, these phases must be synchronized with extreme precision. Dedicated control electronics continuously monitor and adjust the optical phase of every channel to maintain constructive interference.
Beam Combination
Once all laser channels are phase-locked, their outputs are combined using optical elements such as beam splitters, diffractive optical components, or fiber combiners. Because the optical waves are perfectly aligned in phase, they merge into a single beam whose power is approximately equal to the sum of the individual emitters while maintaining high spatial coherence.
Real-Time Feedback and Stabilization
Environmental disturbances such as temperature variations, mechanical vibrations, or air turbulence continuously affect the optical paths. High-speed feedback loops measure these phase deviations in real time and compensate for them using phase modulators or optical delay lines. This active stabilization ensures consistent beam quality and maximum combining efficiency, even in demanding operating environments.
