3D-printed ceramic waveguide lasers could surpass the power of glass fiber lasers by 10 times
At the bottom of the ocean, optical fibers transmit telecommunications and internet data around the world. Waveguides make that feat possible by channeling and amplifying the light—and therefore the data within—over enormous distances.
Researchers at Lawrence Livermore National Laboratory (LLNL) have successfully developed the world's first all-ceramic waveguide laser using 3D printing technology. This groundbreaking achievement, detailed in a paper published in Optics Letters, could potentially provide a 10-fold increase in power output compared to traditional glass fiber lasers, while maintaining a smaller size.
Waveguides, crucial for transmitting light and data over long distances, are typically made from silica glass in glass fiber lasers. However, ceramic waveguides could offer superior heat dissipation and stability, making them more suitable for high-power applications such as national security systems and laser machining.
The key innovation lies in the team's direct ink writing additive manufacturing technique. This process involves squeezing ytterbium-doped yttrium aluminum garnet filaments within an undoped garnet ceramic matrix, forming a highly tailored ceramic structure. By creating a core and cladding material in one monolithic structure, the researchers were able to achieve high fabrication yields and minimize defects at the interface between core and cladding.
Initial testing with the DEVCOM Army Research Laboratory demonstrated high-efficiency laser performance. Looking ahead, the researchers plan to scale up the power output from hundreds of milliwatts to kilowatts, with the ultimate goal of making this technology commercially viable for high-power applications.
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