Fig. 3: Simulated spatial profiles for the second-harmonic frequency components.
From: Laser harmonic generation with independent control of frequency and orbital angular momentum
a–b Spatial profile of the generated −2ω (a) and +2ω (b) light for the circular (n = 0) aperture. c, d Respective profiles for the structured (n = 3) aperture. e–h k-space profile for the same four cases (e: −2ω, n = 0; f: +2ω, n = 0; g: −2ω, n = 3; h: +2ω, n = 3). These profiles are sampled at Z = 5λL.
