151W monolithic diffraction-limited Yb-doped photonic bandgap fiber laser at ~978nm

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

“…For example, IPG Photonics reported a 1.3 kW 1018 nm fiber laser with the beam quality M 2 less than 1.1 [120]. Recently, the efficiency of Yb-doped all-solid photonic bandgap fiber laser operating at approximately 978 nm has been improved to more than 60% with a recording power of 151 W and an excellent beam quality [121].…”

46.9 W 980 nm diffraction-limited monolithic fiber laser based on 20/80 Yb-doped fiber

“…Interestingly, some novel double-cladding YDF designs, such as W-profile fiber [4], tapered large-core fiber [10], saddletype fibers [11], etc., have been demonstrated to realize 10 W all-fiber single mode fiber lasers. Currently, the bestperforming 980 nm laser is achieved using Yb-doped photonic bandgap fiber with an output power of 151 W, a slope efficiency of 63%, and an M 2 factor of 1.25 [12]. The bandgap design enables the fiber to get high guidance loss in the 1030 nm band and negligible at 980 nm, so the 1030 nm parasitic oscillation can be well suppressed.…”

Spectrally U-shaped profile of beam propagation factor in all-solid photonic bandgap fiber

“…More recently, a kind of bandgap-guided microstructure fiber, called the allsolid photonic bandgap fiber (AS-PBGF), has become an emerging research focus [7][8][9][10][11][12] . Free of air-holes structures, AS-PBGF exhibits excellent practical convenience for the high-power platform [13] and portability for the double-cladding design or polarization-maintaining scheme [11] . The all-solid structure ensures the ease of cleaving and splicing, making a compact all-fiber configuration possible.…”

“…Besides, the multi-resonant and hetero-structured designs further open a new path for the super LMA AS-PBGF design [8,17,18] . With all of the above advantages integrated, the controllable distribution of photonic bandgaps (PBGs) of AS-PBGF additionally provides a novel approach for selective wavelength filtering [13,19] . Therefore, AS-PBGF takes most of the prerequisites for highpower laser applications.…”