Figure 1: Concept and experimental realization of the flame lens. | Nature Communications

Figure 1: Concept and experimental realization of the flame lens.

From: Focusing light with a flame lens

Figure 1

(a) Schematic of the ring focus formed by a gas lens. (b) Schematic of the flame lens with a vortex flame to produce sharp focusing. (c) A pencil flame from an oxyacetylene burner is injected into the tube. (d) The vortex nature of the flame forms a luminous sheath near the tube wall.

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