Two series of samples, Nd: KGW (Nd doped gadolinium potassium tungstate) and (Ce,Nd): KGW, were prepared by solid reaction, and excited at 808 nm of wave length by using diode laser device at room temperature. Two ab...Two series of samples, Nd: KGW (Nd doped gadolinium potassium tungstate) and (Ce,Nd): KGW, were prepared by solid reaction, and excited at 808 nm of wave length by using diode laser device at room temperature. Two above conversion fluorescent peaks were observed at 534 nm and 600 nm. The composition and preparation technique of Nd∶KGW luminescent material matrix were investigated, and the mechanism of above conversion luminescence was disscussed. The role of sensitizer (Ce 3+ ) in enhancing luminescence strength was initially studied.展开更多
The Nd^3＋ 3.2% （atom fraction）：KGd（WO4）2 crystal was grown by Kyropoulos method. The absorption spectrum and fluorescence spectrum of Nd^3 ＋ ： KGW crystal were measured. The absorption cross sections at 808 nm...The Nd^3＋ 3.2% （atom fraction）：KGd（WO4）2 crystal was grown by Kyropoulos method. The absorption spectrum and fluorescence spectrum of Nd^3 ＋ ： KGW crystal were measured. The absorption cross sections at 808 nm（0. 6799 × 10^-20 cm^2） were calculated, and the output wavelength of fluorescence is 1064 and 1351 nm. The diode-pumped laser was operated both in the free-running and passively Q-switched operating modes. The maximum laser output（1064 nm） is 326 mW with 62.7 % slope efficiency when input energy is 900 mW. The beam quality factor M^2 ≈ 1.1. The green light of 532 nm is obtained in frequency doubling operation. The laser is passively Q-switched by using Cr^4＋ ：LuAG as saturable absorber. The pulse width is 170 ns at repetitive frequency of 15 kHZ.展开更多
文摘Two series of samples, Nd: KGW (Nd doped gadolinium potassium tungstate) and (Ce,Nd): KGW, were prepared by solid reaction, and excited at 808 nm of wave length by using diode laser device at room temperature. Two above conversion fluorescent peaks were observed at 534 nm and 600 nm. The composition and preparation technique of Nd∶KGW luminescent material matrix were investigated, and the mechanism of above conversion luminescence was disscussed. The role of sensitizer (Ce 3+ ) in enhancing luminescence strength was initially studied.
文摘The Nd^3＋ 3.2% （atom fraction）：KGd（WO4）2 crystal was grown by Kyropoulos method. The absorption spectrum and fluorescence spectrum of Nd^3 ＋ ： KGW crystal were measured. The absorption cross sections at 808 nm（0. 6799 × 10^-20 cm^2） were calculated, and the output wavelength of fluorescence is 1064 and 1351 nm. The diode-pumped laser was operated both in the free-running and passively Q-switched operating modes. The maximum laser output（1064 nm） is 326 mW with 62.7 % slope efficiency when input energy is 900 mW. The beam quality factor M^2 ≈ 1.1. The green light of 532 nm is obtained in frequency doubling operation. The laser is passively Q-switched by using Cr^4＋ ：LuAG as saturable absorber. The pulse width is 170 ns at repetitive frequency of 15 kHZ.
