Recent advancements in laser technology have spurred the demand for high-power, superior beam quality, and ultra-low noise. However, conventional cooling methods fall short of meeting these requirements, as they introduce bulky, cost-ineffective, and vibration-prone solutions. Countering these issues, anti-Stokes fluorescence (ASF) has proven its effectiveness for decades, but it was only in 2020 that it was demonstrated for the first time in standard silica Yb-doped fibers.

Back in 2020 Prof. Digonnet’s research group at Stanford University demonstrated the first self-cooling in Yb-doped optical fiber hosted in silica. This innovation allowed lasers to operate without external cooling systems by preventing heat generation. This breakthrough opened possibilities for more stable, high-quality lasers radiation and today the second generation of radiation-balanced (athermal) fiber lasers and fiber amplifiers are real possibilities.

In a recent publication the world’s first single-frequency radiation-balanced fiber amplifier is unveiled. In the research Dr. Enkeleda Balliu, currently Senior Laser Engineer and Product Manager at HÜBNER Photonics, has joined forces with fellow researchers from Stanford University, Clemson University, University of Illinois, and Universite’ Laval (Canada) to elevate the output power of a fiber laser to hundreds of mW and demonstrate the world’s first single-frequency radiation-balanced fiber amplifier.

These devices utilize a single-mode