Extended Data Fig. 1: Schematic illustration of the experimental setup employed for writing and probing a photonic lattice in a photorefractive crystal. | Nature Physics

Extended Data Fig. 1: Schematic illustration of the experimental setup employed for writing and probing a photonic lattice in a photorefractive crystal.

From: Sub-symmetry-protected topological states

Extended Data Fig. 1

CW: the continuous-wave laser beam; SLM: spatial light modulator; BS: beam splitter; FM: Fourier mask; L: circular lens; SBN: strontium barium niobite crystal; M: mirror; λ/2: half-wavelength plate; CCD: charge-coupled device. The inset shows a laser-written “bridged” kagome lattice used in the experimental work of Fig. 4. The bottom path is used as a reference beam for interference measurement when needed.

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