Abstract
We demonstrate an all-fiber high-power Yb-doped 1018 nm fiber laser with a Gaussian-shaped output beam profile based on a mismatched structure, which consists of a pair of single-mode fiber Bragg gratings and a section of few-mode double-cladding gain fiber. The output power is up to 107.5 W with an optical-to-optical efficiency of 63%, and the 3 dB band is 0.26 nm at this power level. Such a structure of single-mode–few-mode–single-mode fiber oscillator can be used to generate high-power narrow-linewidth lasing with excellent beam quality in other spectral ranges.
Highlights
Yb-doped fiber (YDF) has attracted attention in the past decade due to its excellent capability in high-power output with good beam quality in a wide spectral range from 0.98 to 1.2 μm theoretically[1, 2]
It is indicated that based on the single-mode–few-mode– single-mode (SFS) structure, short-wavelength YDF lasers (YDFLs) would expand the spectral range of spectral beam combining (SBC) from the 1050– 1080 nm band to the 1010–1080 nm band, and that shorter wavelength range combining would be achieved
A high-power narrow-linewidth 1018 nm YDFL with good beam quality based on the SFS mismatched structure is demonstrated
Summary
Yb-doped fiber (YDF) has attracted attention in the past decade due to its excellent capability in high-power output with good beam quality in a wide spectral range from 0.98 to 1.2 μm theoretically[1, 2]. The laser cavity is formed by a pair of fiber Bragg gratings (FBGs) written in single-mode fibers, and the gain medium employs a section of few-mode active fiber In such a structure, the fewmode active fiber can improve the absorption of pump power, leading to a higher output power than a single-mode gain fiber, and the pair of single-mode FBGs can limit the output beam in one mode and guarantee perfect beam quality of the output laser. The fewmode active fiber can improve the absorption of pump power, leading to a higher output power than a single-mode gain fiber, and the pair of single-mode FBGs can limit the output beam in one mode and guarantee perfect beam quality of the output laser This design comes from the all-fiber multimode interference bandpass filter that was reported in 2006[26]. An optical-to-optical efficiency of 63% is achieved at the highest output power of up to 107.5 W, and the 3 dB bandwidth of this short-wavelength fiber laser is only 0.26 nm at 100 W lasing output
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