Abstract
A high-power all-fiber supercontinuum (SC) source in a highly germania-doped fiber (GDF) pumped by a picosecond thulium-doped master oscillator power amplifier (MOPA) system is presented. By further optimizing the length of the GDF, the long-wavelength edge of the wideband flat SC can be broadened to 3 μm. The flat SC has an average output power of 11.62 W and a 3 dB bandwidth of 750 nm. The power proportion beyond 2400 nm is as high as 55.3%. To our knowledge, this SC average output power is the highest from a highly GDF.
Highlights
The supercontinuum (SC) source has attracted widespread attention owing to its superior characteristics such as high brightness, high spatial coherence, broad bandwidth, and good beam quality [1]–[3]
We report an all-fiber high-power germania-doped fiber (GDF)-based SC source with a high mid-IR power proportion
We demonstrate a spectrum-optimized high-power GDF-based SC source
Summary
The supercontinuum (SC) source has attracted widespread attention owing to its superior characteristics such as high brightness, high spatial coherence, broad bandwidth, and good beam quality [1]–[3]. Soft glass fibers are subject to moisture, their low transition temperature makes them too hard to splice with silica fibers, and they have low mechanical resistance Considering these drawbacks, germania fibers have important application value in SCG at near-IR to mid-IR regions. In 2012, Kamynin et al first reported a SC source with spectrum broadened to 2.7 μm based on a segment of highly GDF (64 mol.%) and a nanosecond erbium-doped fiber laser [12]. Zhang et al demonstrated a SC source based on a highly GDF (75 mol.%) with an optimized spectrum ranging from 1.9 to 3 μm [13]. Yin boosted the output power to 30.1 W utilizing a longer pure GCF with a larger core diameter, and the obtained 10 dB spectral bandwidth ranged from 1.95 to 3.0 μm [16]. This is the highest 2–3 μm SC output power from a highly GDF
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