High-energy, high-power ytterbium-doped Q-switched fiber laser

Abstract

We report on a Q -switched, cladding-pumped, ytterbium-doped large-mode-area fiber laser operating at 1090 nm that is capable of generating 2.3 mJ of output pulse energy at a 500-Hz repetition rate and more than 5 W of average output power at higher repetition rates in a high-brightness beam (M(2) = 3) . Using a similar fiber with a smaller core, we generated >0.5-mJ pulses in a diffraction-limited beam. Our results represent a threefold increase in pulse energy over previously published values for Q-switched fiber lasers and firmly establish fiber lasers as compact, multiwatt, multimillijoule pulse sources with large scope for both industrial and scientific applications.

Spatial dopant profiles for transverse-mode selection in multimode waveguides

“…Practical examples of such distributions include large-mode-area fiber 2,6 and bulk lasers with composite rods. 10 However, the selectivity in a fiber will be compromised by the fact that, because of bending, there is always a certain degree of coupling between the propagation modes.…”

“…There is a growing interest in the use of guided-wave geometries for high-power laser operation, in both fiber 1,2 and planar 3,4 formats. The use of high-power diode pump lasers requires multimode waveguides for the confinement of these non-diffraction-limited light sources, but most applications require fundamental-mode laser operation.…”

Theoretical Analysis of Impact of Q-switch Rise Time on Output Pulse Performance in an Ytterbium-doped Actively Q-switched Fiber Laser

“…[1,2] 특히 이터븀이 첨가된 Q-스위칭 광섬유 레이저는 매 우 높은 피크파워와 고 에너지를 갖는 펄스를 생성 할 수 있 기 때문에 의료, 군사, LIDAR 등 많은 응용분야에 이용되고 있다. [3,4] Q-스위칭 레이저는 크게 수동형 방법과 능동형 방 법에 의해서 구동된다.…”

Optimization of Erbium-Doped Actively Q-Switched Fiber Laser Implemented in Symmetric Configuration

“…As a result of these efforts photonic-crystal fibers of very complex design [3], large modal diameter fibers [4], [5] and double-clad fibers [6] have been demonstrated as laser components suitable for generating more powerful laser pulses. Some excellent results have been obtained using these laser components [7], [8], but still the availability of a such components is very poor. We have listed the characteristics of some relevant implementations of Qswitched erbium doped fibre lasers (QS-EDFLs) in Table I, for comparison with this work.…”