Figure 5

Impact of conformally extended absorption.

(a) The setting of the conformally extended absorption which starts from z = z_t with a t μm-thick buffer. (b,c) The amplitude and phase profiles obtained at the Rh entrance when t = 0.35 μm. LP₀₁ profiles are also superimposed for comparison. (b) For z_t = 65 μm, i.e., 3 μm-long conformal absorption, the output becomes indistinguishable from LP₀₁. The inset shows how the increase in the conformal absorption reduces the mismatch in the output amplitude profile, especially near ρ = 2 μm. (c) The conformal absorption also improves the wavefront flatness within the radial extent of CS. (d) The minimum phase and shape errors for various (z_t, t) combinations. Note that δ_p and δ_s minimize simultaneously near (z_t, t) = (65 ~ 66, 0.2 ~ 0.35) μm. (e) The change in the mode power along the propagation through CC and CS. CP/CC: The interface between CP and CC.