Fig. 7: Beam cleaning above the TMI threshold. | Light: Science & Applications

Fig. 7: Beam cleaning above the TMI threshold.

From: Modal energy transfer by thermally induced refractive index gratings in Yb-doped fibers

Fig. 7

a The temporal evolution of the signal output power, normalized to the average signal power of 350 W, with a pump modulation with 200 Hz modulation frequency and ±75% (±262.5 W) modulation depth. b The temporal evolution of the relative modal content (FM (LP01) blue, 1st HOM (LP11) red, 2nd HOM (LP02) yellow); the beam-cleaning area is shaded green; the insets are excerpts from Supplementary Video 4 and represent the beam profiles at the times of negative ET (left) and positive ET/beam cleaning (right)

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