33μm Core Effectively Single-Mode Chirally-Coupled-Core Fiber Laser at 1064-nm

The first fiber laser is demonstrated at 1064-nm using a novel index-guiding-core single- mode fiber (chirally-coupled-core) with V ≫2.405. Robust single-mode operation achieved at all power levels (up-to ~40W) independently of beam excitation and fiber coiling conditions.