5 kW Near-Diffraction-Limited and 8 kW High-Brightness Monolithic Continuous Wave Fiber Lasers Directly Pumped by Laser Diodes
Tandem pumping technique are traditionally adopted to develop >3-kW continuous-wave (cw) Yb<sup>3+</sup>-doped fiber lasers, which are usually pumped by other fiber lasers at shorter wavelengths (1018 nm e.g.,). Fiber lasers directly pumped by laser diode...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2017-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8025378/ |
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| Summary: | Tandem pumping technique are traditionally adopted to develop >3-kW continuous-wave (cw) Yb<sup>3+</sup>-doped fiber lasers, which are usually pumped by other fiber lasers at shorter wavelengths (1018 nm e.g.,). Fiber lasers directly pumped by laser diodes have higher wall-plug efficiency and are more compact. Here we report two high brightness monolithic cw fiber laser sources at 1080 nm. Both lasers consist of a cw fiber laser oscillator and one laser-diode pumped double cladding fiber amplifier in the master oscillator-power amplifier configuration. One laser, using 30-μm-core Yb<sup>3+</sup>-doped fiber as the gain medium, can produce >5-kW average laser power with near diffraction-limited beam quality (M<sup>2</sup><1.8). The slope efficiency of the fiber amplifier with respect to the launched pump power reached 86.5%. The other laser utilized 50-μm-core Yb<sup>3+</sup>-doped fiber as the gain medium and produced >8-kW average laser power with high beam quality (M<sup>2</sup>: ∼ 4). The slope efficiency of the fiber amplifier with respect to the launched pump power reach 83%. To the best of our knowledge, this is the first detailed report for >5-kW near-diffraction-limited and >8-kW high-brightness monolithic fiber lasers directly pumped by laser diodes. |
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| ISSN: | 1943-0655 |