Abstract
Compared with traditional uniform fibers, tapered fiber has numerous unique advantages, such as larger mode area, higher pump absorption, suppression to nonlinear effects, and maintaining good beam quality. In this manuscript, we have constructed an all-fiberized fiber amplifier which is based on a piece of ytterbium-doped tapered double-clad fiber (T-DCF). The fiber amplifier is operated under continuous wave (CW) regime at 1080 nm wavelength. The $M^{2}$ factor of the amplifier at 1.39 kW output power is ${\sim}1.8$. The maximum output power of the system reached 1.47 kW, which, to the best of our knowledge, is the highest output power of long tapered fiber based fiber laser system. Our result successfully verifies the potential of power scalability and all-fiberized capability of long tapered fiber, and the performance of our system can be further enhanced by fiber design optimization.
Highlights
For the advantage of high slope efficiency, good beam quality, superior thermal management property and compactness, fiber lasers are widely used in the field of laser marking, material processing, medicine, communication and many other industrial applications[1]
Output power of fiber lasers experienced a rapid boost with the development of large mode area (LMA) double-clad fibers (DCF) and cladding pump technology[2, 3]
Compared with traditional fiber laser oscillator, the main oscillator power amplifier (MOPA) system, which can boost the progress of fiber laser power scaling, offers an effective way to acquire high power fiber laser source with excellent beam quality by employing cascaded structure
Summary
For the advantage of high slope efficiency, good beam quality, superior thermal management property and compactness, fiber lasers are widely used in the field of laser marking, material processing, medicine, communication and many other industrial applications[1]. Output power of fiber lasers experienced a rapid boost with the development of large mode area (LMA) double-clad fibers (DCF) and cladding pump technology[2, 3]. Ytterbium-doped fiber lasers and amplifiers at 1 μm have shown excellent optical efficiency[4, 5] and have reached over 100 kW output power by combining tens of kW-level single mode fiber lasers. Compared with traditional fiber laser oscillator, the main oscillator power amplifier (MOPA) system, which can boost the progress of fiber laser power scaling, offers an effective way to acquire high power fiber laser source with excellent beam quality by employing cascaded structure. Compared to uniform LMA active fiber, T-DCF shows numerous unique advantages when
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