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Researchers from Huazhong University of Science and Technology reported the use of filled aperture coherent beam combining technology to achieve an ultrafast fiber laser system with an average power output of 403 W, 0.5 mJ pulse energy, and 260 fs. Excellent beam quality (M2 The work titled "260 fs, 403 W coherently combined fiber laser with precise high-order dispersion management" was published in Frontiers of Optoelectronics.

Spectralbeam combining

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Incoherentbeam combining

Yes, that is where the factor $I$ in the equation comes in. It is known as the second moment of area, and for a rectangular beam of width $w$ and height $h$ it is

Coherent beam combination (CBC) technology is an effective strategy to break through the limits of a single fiber laser amplifier and further achieve power/energy scaling.

Coherent beam combiningcost

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Towards ultimate high-power scaling:coherent beam combiningof fiber lasers

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More information: Shuangxi Peng et al, 260 fs, 403 W coherently combined fiber laser with precise high-order dispersion management, Frontiers of Optoelectronics (2024). DOI: 10.1007/s12200-024-00107-5

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High-power, high-energy ultrafast fiber lasers are indispensable tools in various fields, from basic and applied science research to industrial processing. However, due to thermal effects, nonlinear effects, there is always a limit to the power/energy expansion of a single fiber laser amplifier.

Coherent beam combiningppt

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In the future, it is expected that using only four channel coherent synthesis can increase power to the kw level and pulse energy to the mJ level.

Coherent beam combiningpdf

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Diffractive Optical Elements (DOE) Diffusers homogenize a light source and expand a narrower beam into a broad range of angles, without the limitations imposed ...

Spectral vscoherent beam combining

Laserbeam combiningmethods

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In addition, CBC operates at an average power of over 230 W per channel, simplifying system complexity and operational difficulty.

By utilizing integrated electronic dispersion hardware, effective compensation has been achieved for the incomplete compensation of high-order dispersion after grating compression, optimizing pulse width while also achieving superior improvement in pulse quality.

Under the conditions of mutual coherence and stable phase relationship, multiple laser beams can be superimposed and mutually interfere with each other. This approach allows for an improvement in average power and pulse energy by a factor almost equal to the total number of combined channels. However, with the increase of beam combining channels, the complexity of CBC systems also increases, bringing negative impacts such as decreased beam combining efficiency, degraded beam quality, and increased operational difficulty to the system.

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