Amplification and ASE suppression in a polarization-maintaining ytterbium-doped all-solid photonic bandgap fibre

Abstract

We demonstrate suppression of amplified spontaneous emission at the conventional ytterbium gain wavelengths around 1030 nm in a cladding-pumped polarization-maintaining ytterbium-doped all-solid photonic crystal fibre. The fibre works through combined index and bandgap guiding. Furthermore, we show that the peak of the amplified spontaneous emission can be shifted towards longer wavelengths by rescaling the fibre dimensions. Thereby one can obtain lasing or amplification at longer wavelengths (1100 nm - 1200 nm) as the amount of amplification in the fibre is shown to scale with the power of the amplified spontaneous emission.

Highly-stable monolithic femtosecond Yb-fiber laser system based on photonic crystal fibers

“…This fiber consists of fused SiO 2 core and matrix, and B:SiO 2 and Ge:SiO 2 rods, and is guiding using a hybrid mechanism: by total internal reflection (TIR) between SiO 2 core and B:SiO 2 rods in one plane, and by photonic bandgap mechanism provided by Ge:SiO 2 rods in the orthogonal plane [10,11]. A scanning electron microscope (SEM) image of this fiber is shown in Fig.…”

Understanding formation of photonic bandgap edge for maximum propagation angle in all-solid photonic bandgap fibers

“…Recently, all-solid photonic bandgap fibers (PBGFs) [1][2][3][4][5][6][7][8][9][10][11][12][13], which are one of the types of solid-core PBGFs, have attracted considerable attention due to their unusual transmission characteristics that cannot be obtained by conventional optical fibers. In all-solid PBGFs, the cladding is composed of periodically arranged high-index rods and the core is formed by omitting one or several rods.…”

Effective area limit of large-mode-area solid-core photonic bandgap fibers for fiber laser applications

“…The former is expected to realize multiple useful devices such as electrically or thermally tunable filters and polarimeters, by externally applying an electric field or changing the temperature of the liquid crystals [29][30][31][32][33]. The latter, on the other hand, can be applied to selection of lasing transition in fiber lasers [34], suppression of Raman gain for the high-power laser delivery [35], and suppression of amplified spontaneous emission in fiber amplifiers [36], by taking advantage of its fiber-type functionality of alternate transmission and transmission-inhibited bands.…”