Demonstration of 3 kW-Level Nearly Single Mode Monolithic Fiber Amplifier Emitting at 1050 Nm Employing Tapered Yb-Doped Fiber

Abstract

Tapered Yb-doped fiber (T-YDF) can balance the suppression of transverse mode instability (TMI) and stimulated Raman scattering (SRS) in high power fiber lasers. In this work, we have constructed an all-fiberized master oscillator power amplifier emitting at the central wavelength of 1050 nm based on a T-YDF and investigated the laser performance in respective co-pumped and counter-pumped configurations. The results show that the T-YDF can effectively mitigate SRS effect in short-wavelength fiber lasers.A nearly single mode beam quality (M2∼1.20) is obtained at output power of 3 kW-level. In particular, the SRS suppression ratio in the co-pump and counter-pump scheme is about ∼33.2 dB at ∼3039 W and ∼46.6 dB at ∼2818 W, respectively. By further optimizing the structure of the tapered active fiber, it is promising to further improve the output power and beam quality in short-wavelength fiber lasers.

Ytterbium-Doped Fiber Laser as a Source of Coexisting Narrow-Band Thermal Light and Optical Rogue Waves: Experimental Demonstration

“…[1][2][3][4][5][6]. CW double-clad (DC) YDFLs are very efficient light sources with optical-tooptical conversion efficiency as high as 80% [1,7,8] and a wide optical range, from ~ 975 nm to ~ 1180 nm [9][10][11][12][13][14], with output power scalable up to very high levels, from several kW in single mode [7,8,15] to tens of kW in multi-mode configurations [16][17][18]. Due to very large power scaling and the perfect energy budget YDFLs found a great number of biomedical [19,20] and industrial applications [21], they can be used as an optical pump for other types of lasers [22][23][24][25], for frequency nonlinear conversion [26,27], and so on.…”