28 April 2009 Cr-doped materials as potential broadband and tunable sources
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Abstract
Various oxidation states and location sites of chromium (Cr) in doped crystal have been known. Since the high sensitivity of ligand field on chromium ions, these are attributable to a broadband emission. The wide broadband emission can potentially be exploited in many ways. For instance, a Cr-doped broadband amplified spontaneous emission can improve spatial resolution many times in optical coherence tomography (OCT) diagnostic instrumentation. It is difficult to further extend the emission bandwidth of Cr in a single crystal, although a single crystal is generally considered as the best host. Amorphous as a host, on the other hand, may potentially expand the bandwidth of emission and accommodate higher doping concentration. However, a single crystal is beneficial to a specific valance state through charge compensation technique. To investigate chromium's full potential, both Cr-doped nano-crystalline embedded in an amorphous host and Cr-doped glasses are proposed. The ultimate aims are capable of tailoring oxidation states, site symmetry and concentrations of Cr doping. In the first stage, Cr:YAG-doped silica fiber will be studied as a part of our research scope.
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Jau-Sheng Wang, Jau-Sheng Wang, Vincent Huang, Vincent Huang, Yen-Sheng Lin, Yen-Sheng Lin, Wood-Hi Cheng, Wood-Hi Cheng, } "Cr-doped materials as potential broadband and tunable sources", Proc. SPIE 7339, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications V, 73390R (28 April 2009); doi: 10.1117/12.827661; https://doi.org/10.1117/12.827661
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