Diagram of coherent beam combining experimental setup. Credit score: Shuangxi Peng, Zhihao Wang, Feilong Hu, Zhengyan Li, Qingbin Zhang, Peixiang Lu
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Diagram of coherent beam combining experimental setup. Credit score: Shuangxi Peng, Zhihao Wang, Feilong Hu, Zhengyan Li, Qingbin Zhang, Peixiang Lu
Excessive-power, high-energy ultrafast fiber lasers are indispensable instruments in numerous fields, from fundamental and utilized science analysis to industrial processing. Nonetheless, because of thermal results, nonlinear results, there’s at all times a restrict to the facility/power enlargement of a single fiber laser amplifier.
Coherent beam mixture (CBC) know-how is an efficient technique to interrupt by way of the boundaries of a single fiber laser amplifier and additional obtain energy/power scaling.
Beneath the circumstances of mutual coherence and secure section relationship, a number of laser beams might be superimposed and mutually intervene with one another. This method permits for an enchancment in common energy and pulse power by an element virtually equal to the entire variety of mixed channels. Nonetheless, with the rise of beam combining channels, the complexity of CBC techniques additionally will increase, bringing destructive impacts akin to decreased beam combining effectivity, degraded beam high quality, and elevated operational problem to the system.
Researchers from Huazhong College of Science and Expertise reported the usage of crammed aperture coherent beam combining know-how to realize an ultrafast fiber laser system with a median energy output of 403 W, 0.5 mJ pulse power, and 260 fs. Wonderful beam high quality (M2 <1.2) was achieved whereas making certain good energy stability (RMS <0.5%).
The work titled “260 fs, 403 W coherently mixed fiber laser with exact high-order dispersion administration” was revealed in Frontiers of Optoelectronics.
By using built-in digital dispersion {hardware}, efficient compensation has been achieved for the unfinished compensation of high-order dispersion after grating compression, optimizing pulse width whereas additionally attaining superior enchancment in pulse high quality.
As well as, CBC operates at a median energy of over 230 W per channel, simplifying system complexity and operational problem.
Sooner or later, it’s anticipated that utilizing solely 4 channel coherent synthesis can improve energy to the kw degree and pulse power to the mJ degree.
Extra data:
Shuangxi Peng et al, 260 fs, 403 W coherently mixed fiber laser with exact high-order dispersion administration, Frontiers of Optoelectronics (2024). DOI: 10.1007/s12200-024-00107-5
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