We have demonstrated a laser-diode pumped Nd:GdVO4 extra-cavity frequency tripling ultraviolet laser with a LBO crystal in this paper.Under the acousto-optic （A-O） Q-switched operation,we have obtained 355 nm ultrav...We have demonstrated a laser-diode pumped Nd:GdVO4 extra-cavity frequency tripling ultraviolet laser with a LBO crystal in this paper.Under the acousto-optic （A-O） Q-switched operation,we have obtained 355 nm ultraviolet laser,with pulse width of 25 ns and pulse repetition rate of 20 kHz.By using a type Ⅰ non-critical phase-matched LBO crystal,the SHG output power of 822 mW is achieved at the incident pump power of 16 W. The output power of 355nm UV laser is 260mW with a type Ⅱ phase-matched LBO crystal,and the conversion efficiency （1 064 nm-355 nm ） is 5.9 %.The power stability of 355 nm laser is 1.7% in 1 h.展开更多
Nanosized GdVO4 powders were synthesized via a sol-gel method using different carboxylic acids as chelating agent, followed by calcination at 600 ℃for 3 h. The effect of different carboxylic acids such as citric acid...Nanosized GdVO4 powders were synthesized via a sol-gel method using different carboxylic acids as chelating agent, followed by calcination at 600 ℃for 3 h. The effect of different carboxylic acids such as citric acid, malic acid, and tartaric acid on the characteristics of the nanosized GdVO4 powders was investigated. The GdVO4 powder was also synthesized without carboxylic acid for comparison. The thermal decomposition process of the car- boxylate precursors was investigated by thermogravimetric differential thermal analysis （TG-DTA）. X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, field emission scanning electron microscope （FESEM）, transmission electron microscope （TEM）, and surface area measurement data were used to confirm the formation of nanocrystalline GdVO4 powders. It is found that the synthesis using the carboxylic acid with higher heat of combustion results in the powder with larger crystallite size. The difference in the steric effect of the acids used, which was evaluated by a computational method, also affects the degree of agglomeration of the synthesized powders.展开更多
基金Supported by Natural Science Foundation of Shandong under No.Z003A01
文摘We have demonstrated a laser-diode pumped Nd:GdVO4 extra-cavity frequency tripling ultraviolet laser with a LBO crystal in this paper.Under the acousto-optic （A-O） Q-switched operation,we have obtained 355 nm ultraviolet laser,with pulse width of 25 ns and pulse repetition rate of 20 kHz.By using a type Ⅰ non-critical phase-matched LBO crystal,the SHG output power of 822 mW is achieved at the incident pump power of 16 W. The output power of 355nm UV laser is 260mW with a type Ⅱ phase-matched LBO crystal,and the conversion efficiency （1 064 nm-355 nm ） is 5.9 %.The power stability of 355 nm laser is 1.7% in 1 h.
基金financially supported by the Chiang Mai University (CMU) Junior Research Fellowship Programthe National Research University (NRU) Project from Thailand's Office of the Higher Education Commission
文摘Nanosized GdVO4 powders were synthesized via a sol-gel method using different carboxylic acids as chelating agent, followed by calcination at 600 ℃for 3 h. The effect of different carboxylic acids such as citric acid, malic acid, and tartaric acid on the characteristics of the nanosized GdVO4 powders was investigated. The GdVO4 powder was also synthesized without carboxylic acid for comparison. The thermal decomposition process of the car- boxylate precursors was investigated by thermogravimetric differential thermal analysis （TG-DTA）. X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, field emission scanning electron microscope （FESEM）, transmission electron microscope （TEM）, and surface area measurement data were used to confirm the formation of nanocrystalline GdVO4 powders. It is found that the synthesis using the carboxylic acid with higher heat of combustion results in the powder with larger crystallite size. The difference in the steric effect of the acids used, which was evaluated by a computational method, also affects the degree of agglomeration of the synthesized powders.
