Abstract

We report optical amplification of Ar2* at 126nm, pumped by optical-field-induced ionization (OFI) created by an infrared high-intensity laser. A gain–length product of 0.84 was obtained by using multipass amplification with a vacuum ultraviolet (VUV) cavity. The gain–length product was increased up to 4.3 through the use of single-pass amplification with a VUV reflector and a hollow 5.0cm-long fiber. Similar small signal gain coefficients of 0.84 and 0.86cm1 were obtained in two different experiments, in which OFI Ar plasma gain media were produced in free space filled with Ar and inside an Ar-filled hollow fiber.

© 2011 Optical Society of America

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