Fig. 3: The design of the high-order modes leakage fiber. | Light: Science & Applications

Fig. 3: The design of the high-order modes leakage fiber.

From: Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification

Fig. 3

a The designed bat-type refractive index distribution (ΔL1 is the diameter within the center region, ΔL2 is the diameter within the stepped region, ΔL3 is the diameter within the gully region, Δn1 represents the refractive index difference between the center point of the center region and the cladding, Δn2 represents the refractive index difference between the stepped region and the cladding, Δn3 represents the refractive index difference between the gully region and the cladding). b The fabrication process. c The measured actual refractive index distribution. d Beam profile obtained from the finite element simulation. e The actual beam profile obtained from the beam quality monitor. f The electron micrograph image of the HOMLF fiber

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