Single frequency Yb-doped fiber laser based on graphene loop mirror filter

Abstract

We report a new method for obtaining a stable single-frequency Yb-doped fiber laser by introducing a graphene film into a fiber loop mirror combined with a simple linear cavity. The graphene film acts as a saturable absorber so as to form a dynamic absorbing grating in the 3 dB fiber loop. This grating is like a narrow-band filter for discriminating and selecting longitudinal modes. Moreover, we use a polarization controller in the linear resonator to suppress the spatial hole burning effect. The maximum output power is 16 mW at 1 064 nm with a pump power of 110 mW at 975 nm, the slope efficiency is 15%, and the SNR is about 60 dB. To the best of our knowledge, this is the first demonstration of a 1 064 nm single-frequency laser based on a linear cavity with a graphene-loop mirror filter.

GeAs2 Saturable Absorber for Ultrafast and Ultranarrow Photonic Applications

“…Recently, the application of 2D materials for achieving SFFLs has become a highlighted direction. [36,51,52] Therefore, we also applied the D-shaped GeAs 2 SA to the SFFLs. A loop cavity SFFL was constructed for verification.…”

“…[28] The SA is the key device for generating UFFLs and SFFLs. Owing to their high third-order optical nonlinearity, [29] unique electronic band structure, [30][31][32] controllable modulation depth, [33,34] and broadband saturable absorption, [35] 2D materials have acted as SAs in UFFLs and SFFLs, including graphene, [6,36] black phosphorus, [37] transition metal dichalcogenides, [38][39][40] topological insulators, [41,42] and MXenes. [43][44][45] In this paper, as-prepared GeAs 2 single crystals were successfully fabricated into nanosheets by the liquid-phase exfoliation method.…”

Tunable far-infrared plasmonically induced transparency in graphene based nano-structures

“…In addition, they often perform well in visible and near-infrared spectra [22]. Graphene, a two dimensional layer of carbon atoms possessing outstanding features, such as high carrier mobility characteristics [23], extreme wave confinement [24], and electrostatic voltage dependent conductivity [25], can be considered as a promising material capable of being employed in various plasmonic structures, such as filters [26], modulators [27], and sensors [28]. Also, various PIT components in different graphene based configurations, including single and double layer structures [29,30], circular resonators [31], periodically patterned nanostrips [32][33][34][35][36], Fabry-Perot resonators [37], complementary graphene meta-materials [38,39], and air-silicon grating structures [40], have been proposed and investigated.…”

Eye-diagram and Q factor evaluation of fiber ring laser in lightwave transmission

“…Fiber lasers employing a linear-cavity can be understood as a length of optical fiber acting as the gain medium, having been doped with rare earth elements, with two reflected mirrors on either side of the fiber ends. However, we choose the ring cavity as the main cavity structure, because the ring cavity configuration can avoid spatial hole burning (SHB) that generates the multi-longitudinal -mode operation in fiber lasers [7,8]. Furthermore, the optical signal to noise ratio (OSNR) of ring-cavity fiber lasers is generally larger than that of linear-cavity lasers.…”