20 W continuous-wave cladding-pumped Nd-doped fiber laser at 910 nm

Abstract

We demonstrate a double-clad fiber laser operating at 910 nm with a record power of 20 W. Laser emission on the three-level scheme is enabled by the combination of a small inner cladding-to-core diameter ratio and a high brightness pump source at 808 nm. A laser conversion efficiency as high as 44% was achieved in CW operating regime by using resonant fiber Bragg reflectors at 910 nm that prevent the lasing at the 1060 nm competing wavelength. Furthermore, in a master oscillator power-amplifier scheme, an amplified power of 14.8 W was achieved at 914 nm in the same fiber.

Watt-level single-frequency tunable neodymium MOPA fiber laser operating at 915–937 nm

“…Recently, neodymium (Nd) doped fiber operating on the 4 F3/2-4 I9/2 transition have attracted high interest for the development of high-power lasers operating in the 900-940 nm spectral window. However, this type of lasers has only been demonstrated in longitudinal multimode operation, by using resonant cavity configurations combined with wavelength selection elements [7][8][9] or with photonic crystal fiber [10], in order to increase the gain at 910-940 nm and suppress the 1060 nm emission. In this Letter, we report for the first time to the best of our knowledge a Watt-level single-frequency all-fiber laser, tunable in the 915-937 nm window, with an output power in excess of 2 W from 921 to 933 nm.The Master Oscillator Power Amplifier (MOPA) Nd-doped fiber laser is composed of two amplification stages, a preamplifier and a booster amplifier (see Fig.…”

“…In the future, we plan to develop an all-fiber polarized MOPA laser which will enable the generation of blue laser radiation, by cavity-assisted second harmonic generation process. We also plan to increase the output power up to 10 W by using Large Mode Area fibers (LMA) [7,10]. However, the development of a mode field adapter with Nd doped fibers will be required to maintain an all fiber structure.…”

Ultrafast time-stretch imaging at 932 nm through a new highly-dispersive fiber

“…For the short pulse generation, nonlinear polarization rotation (NPR) modelocking was introduced to a fiber ring resonator [11,12]. The gain medium was a 20-m double-cladding neodymium-doped fiber (NDF), iXblue IXF-2CF-Nd 5-125 [13][14][15]. The NDF has a core size of 5  0.5 μm and a standard cladding diameter of 125  3 μm.…”

Crystal Planar Waveguides, a Power Scaling Architecture for Low-Gain Transitions

“…Key examples of this for powerscaling the 9xx nm transition are double-clad glass fibers [52], [53], crystal fibers [54], [55], or PWs [25], [56]. Ultimately, it is the combination of low-loss waveguides, high pump-irradiancelength product, and the excellent thermal management characteristics provided by the PW that has proved to be critical in power-scaling this laser transition into the 100 W regime [35].…”