We propose and demonstrate a Q-switched erbium-doped fiber laser （EDFL） using an erbium-doped zirconia-alumina silica glass-based fiber （Zr-EDF） as a saturable absorber. As a 16-cm-long Zr-EDF is incorporated into...We propose and demonstrate a Q-switched erbium-doped fiber laser （EDFL） using an erbium-doped zirconia-alumina silica glass-based fiber （Zr-EDF） as a saturable absorber. As a 16-cm-long Zr-EDF is incorporated into a ring EDFL cavity, a stable Q-switching pulse train operating at 1565？nm wavelength is successfully obtained. The repetition rate is tunable from 33.97？kHz to 71.23？kHz by increasing the pump power from the threshold of 26？mW to the maximum of 74？mW. The highest pulse energy of 26.67？nJ is obtained at the maximum pump power.展开更多
A zirconia alumina powder with a near spherical shape and an average size of 0.1～0.2 μm was prepared by co precipitation. XRD analysis shows that α Al 2O 3 phase may be directly transformed from amorphous in calcin...A zirconia alumina powder with a near spherical shape and an average size of 0.1～0.2 μm was prepared by co precipitation. XRD analysis shows that α Al 2O 3 phase may be directly transformed from amorphous in calcining the hydroxide composite. The ZrO 2 Al 2O 3 composite ceramics manufactured from this powder has the maximum fracture toughness of 9 MPa·m -1/2 at 15% ZrO 2 and 740 MPa fracture strength at 5% ZrO 2. Zirconia grains about 1 μm in diameter are dispersed uniformly in the alumina ceramic matrix.展开更多
Zirconia alumina composite was prepared as rigid microspheres by means of a sol gel process. Scan electron micrograph, electron spectroscopy, nitrogen adsorption, and potentiometric titration were used to characterize...Zirconia alumina composite was prepared as rigid microspheres by means of a sol gel process. Scan electron micrograph, electron spectroscopy, nitrogen adsorption, and potentiometric titration were used to characterize the zirconia alumina composite before and after acid etching. After the acid etching, the specific surface area of the zirconia alumina composite is about five times larger than that before acid etching; the molar ratio of Zr/Al and the acidity also increases, while the pore size decreases. The normal phase chromatographic performance of the zirconia alumina composite before and after acid etching was studied by using dichloromethane/cyclohexane, chloroform/cyclohexane, ethanol/cyclohexane as mobile phases. After the acid etching the zirconia alumina composite exhibited a higher column efficiency and different separation selectivity as compared with that before the acid etching. Basic compounds have a greater retention on the composite after the acid etching.展开更多
基金Supported by the Postgraduate Research of Malaysia under Grant No PG098-2014Bthe CSIR of Government of India
文摘We propose and demonstrate a Q-switched erbium-doped fiber laser （EDFL） using an erbium-doped zirconia-alumina silica glass-based fiber （Zr-EDF） as a saturable absorber. As a 16-cm-long Zr-EDF is incorporated into a ring EDFL cavity, a stable Q-switching pulse train operating at 1565？nm wavelength is successfully obtained. The repetition rate is tunable from 33.97？kHz to 71.23？kHz by increasing the pump power from the threshold of 26？mW to the maximum of 74？mW. The highest pulse energy of 26.67？nJ is obtained at the maximum pump power.
文摘A zirconia alumina powder with a near spherical shape and an average size of 0.1～0.2 μm was prepared by co precipitation. XRD analysis shows that α Al 2O 3 phase may be directly transformed from amorphous in calcining the hydroxide composite. The ZrO 2 Al 2O 3 composite ceramics manufactured from this powder has the maximum fracture toughness of 9 MPa·m -1/2 at 15% ZrO 2 and 740 MPa fracture strength at 5% ZrO 2. Zirconia grains about 1 μm in diameter are dispersed uniformly in the alumina ceramic matrix.
文摘Zirconia alumina composite was prepared as rigid microspheres by means of a sol gel process. Scan electron micrograph, electron spectroscopy, nitrogen adsorption, and potentiometric titration were used to characterize the zirconia alumina composite before and after acid etching. After the acid etching, the specific surface area of the zirconia alumina composite is about five times larger than that before acid etching; the molar ratio of Zr/Al and the acidity also increases, while the pore size decreases. The normal phase chromatographic performance of the zirconia alumina composite before and after acid etching was studied by using dichloromethane/cyclohexane, chloroform/cyclohexane, ethanol/cyclohexane as mobile phases. After the acid etching the zirconia alumina composite exhibited a higher column efficiency and different separation selectivity as compared with that before the acid etching. Basic compounds have a greater retention on the composite after the acid etching.
