Design of large mode area multicore photonic crystal fiber with a flat-top mode

Design of Photonic Crystal Fiber with Large Mode Area for Flat-top Mode Generation

“…A layered arrangement is used to form the cladding. Moreover, when the difference between the effective refractive index of the mode and refractive index of the doped layer of the fiber core is less than 5×10 -4 , it can be considered that a flat-top mode field is generated in the fiber [8,17].…”

“…On the other hand, when the mole percentage of doping is reduced to make the of the doped layer 1.4502, the power flow distribution becomes a convex shape in the middle. This is mainly due to the low of the outer core and the lack of good outward diffusion of the mode field, which results in higher power in the inner core [8]. A finer calculation for the effect of the of the outer layer of the core is performed.…”

“…But the obtained effective mode area ( ) of the flat-top light field is too small. The side length of the resulted square spot is only 2~3 μm [8]. In high-power laser systems, in order to reduce the adverse effects of nonlinear effects [9], it is necessary to increase the effective mode area and reduce the light power density, as larger can effectively reduce the light power density [10].…”

Design of photonic crystal fiber with large mode area for flat-top mode generation

“…But the obtained effective mode area (𝐴 𝑒𝑓𝑓 ) of the flat-top light field is too small. The side length of the resulted square spot is only 2~3 μm [8]. In high-power laser systems, in order to reduce the adverse effects of nonlinear effects [9], it is necessary to increase the effective mode area and reduce the light power density, as larger 𝐴 𝑒𝑓𝑓 can effectively reduce the light power density [10].…”

Multicore chalcogenide photonic crystal fibers for large mode area and mode shaping

“…MCPCF lasers and amplifiers offer an attractive strategy for upscaling the power of fiber-based sources [3][4][5]. Such fibers provide larger mode areas, which can reduce thermo-optical damage and stress-induced beam distortion in high-power fiber lasers and amplifiers [6][7][8][9][10][11][12]. However, high beam quality in a multicore-fiber can be achieved only when individual core outputs are phase locked [8,13,14].…”