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Schematic of GDVN. The GDVN is assembled by placing a smaller, hollow-core fused silica optical fiber (inner capillary) inside a larger, borosilicate glass capillary (outer capillary). Crystals are passed through the inner capillary while a focusing gas is passed through the outer capillary and thus occupies the space in between the two capillaries. A thin, micrometer jet is produced when the co-flowing gas meets the crystals as they exit the inner capillary. The scale bar is 0.1 mm.
