Broadband infrared generation in liquid-bromine-core optical fibers

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Abstract
A new Raman-gain medium suitable for use throughout the infrared spectral region is described. Hollow silica fibers with liquid-bromine cores are shown to have very large Raman-gain coefficients (γ = 1.7 × 10−8 cm/W at 1.1 μm with a Raman shift of 312 cm−1). The liquid-bromine core, being a homonuclear diatomic material, has no first-order infrared absorption, and transparency between 1 and 16 μm has been verified. Broadband infrared radiation between 1.1 and 4 μm was generated by stimulated Raman scattering in bromine-core fibers pumped with 1.06- and 2.11-μm radiation.