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A solid-core tellurite glass fiber with 1.8 dB/m loss at 1.55 μm was made by using the built-in casting preform fabrication method and rod-in-tube fiber drawing technique. Pumping a 10 cm fiber piece with picosecond pulses of 3-5×10(12) W/cm(2), 0.1% of the fundamental power limited by the coherence length of 0.3-5 μm was converted into visible third-harmonic power tunable over a broad near-IR wavelength ranging from 1500 to 1680 nm. Frequency conversion from the mid-IR to near-IR was found to be even more efficient due to the longer coherence lengths of 12-20 μm in the wavelength range of 2200-2500 nm.

Abstract: In this study we report on surface crystallization phenomena and propose a solution for the fabrication of long and robust tellurite glass fibers. The bulk tellurite glasses of interest were prepared by melting and quenching techniques. Tellurite glass preforms and fibers were fabricated by suction casting and rod-in-tube drawing methods, respectively. The surfaces of the tellurite bulk glass samples and of the drawn fibers prepared under different controlled atmospheres were examined by X-ray diffraction. When the tellurite glass fibers were drawn in ambient air containing water vapor, four primary kinds of small crystals were found to appear on the fiber surface, α-TeO2, γ-TeO2, Zn2Te3O8 and Na2Zn3(CO3)4·3H2O. A mechanism for this surface crystallization is proposed and a solution described, using an ultra-dry oxygen gas atmosphere to effectively prevent surface crystallization during fiber drawing. [Copyright &y& Elsevier]

Abstract: We report for the first time the realization of the optical fiber doped with silicon nano-particles. Silica glass optical fibers incorporated with silicon nano-particles were fabricated by the modified chemical vapor deposition and the solution doping technique. We found that a broadband absorption appeared at 450–1300nm and a photoluminescence band appeared at 600–1100nm upon pumping with the Ar-ion laser, indicating that silicon nano-particles were successfully incorporated in the fiber core. We also estimated the third-order optical nonlinearity of the optical fibers by measuring the fringe shift obtained from the long-period gratings upon pumping with the Ar-ion laser from 477 to 512nm. Importantly the optical nonlinearity at 1550nm was found to be ∼1.5×10−15 m2/W and we believe that this large optical nonlinearity is caused by the exciton absorption of the silicon particles. [Copyright &y& Elsevier]

Abstract: A germano-silicate optical fiber codoped with Pb2+ and Al3+ was developed by modified chemical vapor deposition and solution doping techniques. The non-resonant third-order optical nonlinearity was measured to be 6.9105×10−20 m2/W by using the continuous-wave self-phase modulation method. The enhanced non-resonant nonlinearity was ascribed to the increasing number of non-bridging oxygens due to the incorporation of the glass modifiers Pb2+ and Al3+, the large molar refraction from heavy metal ions Pb2+, and the enhanced hyper-polarization from PbO doped into the core of the made fiber. [Copyright &y& Elsevier]

Silver nanocrystal-incorporated germano-silicate optical fiber was fabricated by modified chemical vapor deposition and solution doping techniques. By measuring the wavelength shift of the fringes obtained from the long-period fiber grating pair, upon pumping with an argon-ion laser at 499 nm, the resonant nonlinear refractive index around 1550 nm was estimated to be 5.4×10-16 m2/W. The observed high resonant optical nonlinearity of the silver nanocrystal-incorporated fiber is attributed to the contribution from the surface plasmon resonance of silver nanocrystals embedded in the fiber core. [ABSTRACT FROM AUTHOR]

Abstract: We report development of a new fiber doped with PbSe quantum dots for nonlinear optical applications. PbSe quantum dots related absorption peaks were obtained at 1021, 1093 and 1351nm. The resonant optical nonlinearity and attenuation at 1500nm were measured to be 9.4×10− 16 m2/W and 0.01dB/m, respectively. The emission around 1540nm was observed upon near resonant pumping at 1064nm. [ABSTRACT FROM AUTHOR]