Broadband near BR. emission by Chromium doped fiber is useful for applications in optical communications and bio-photonics. Cr doped YAG double-clad crystal fiber has shown 270-nm emission centered around 1400 nm, which is good for applications in optical communications. YAG-silica interdiffused fiber with Cr doping has generated 240-nm emission centered around 1200 nm, which has high penetration depth in bio samples. These broadband emissions are attributed to Cr{sup}(4+) emission under different local sites. The emission from Cr{sup}(3+) is usually in the visible range, and is excited by ～600 nm pump wavelength. In this paper, we demonstrate that under a pump wavelength of 900 nm, greater than 400 nm near IR emission centered at 1.14μm can be generated, which is mainly attributed to the overlapping of Cr{sup}(3+) and Cr{sup}(4+) emission spectra.
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