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19 results on '"Ma, Chang-qin"'

7. Refractive index profiles of LiB[sub 3]O[sub 5] waveguides formed by MeV He ion irradiation.

Author

Wang, Ke-Ming, Hu, Hui, Lu, Fei, Chen, Feng, Shi, Bo-Rong, Ma, Chang-Qin, Lu, Qing-Ming, and Shen, Ding-Yu

Subjects
REFRACTIVE index, LITHIUM compounds, WAVEGUIDES
Abstract

LiB[sub 3]O[sub 5] crystals were irradiated with MeV He[sup +] ions of different fluences and energies. The refractive index profiles, n[sub x], n[sub y], and n[sub z] in LiB[sub 3]O[sub 5] waveguides are given. The results show that: (1) the thickness of the ion irradiated waveguides can be estimated by the mean projected range of irradiated ions, and the refractive index changes in ion irradiated waveguides are mainly caused by nuclear collisions; (2) after annealing at 200 °C for 40 min., the height of the optical barrier in the LiB[sub 3]O[sub 5] waveguide is decreased; (3) the attenuation measured is 0.87 dB/cm for m = 0 in the LiB[sub 3]O[sub 5] waveguide irradiated with 2.8 MeV He[sup +] to 5 × 10[sub 16] ions/cm²; and (4) it is possible to make double waveguides in LiB[sub 3]O[sub 5] by MeV He[sup +] ion irradiation. [ABSTRACT FROM AUTHOR]

Published
2002
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19. Double waveguide in NdLiP4O12 laser crystal formed by MeV He+ ion implantation

Author

Wang, Ke-Ming, Chen, Feng, Hu, Hui, Wang, Xue-Lin, Shi, Bo-Rong, Lu, Qing-Ming, Ma, Chang-Qin, and Shen, Ding-Yu

Subjects
*WAVEGUIDES, *ELECTRIC waves, *SOLUTION (Chemistry), *ION bombardment
Abstract

Abstract: NdLiP4O12 crystals can be used for low-threshold, miniature laser. A double waveguide structure in a NdLiP4O12 laser crystal formed by ion implantation is for the first time reported. Double waveguide in NdLiP4O12 laser crystal is formed with 2.8 and 1.8MeV He ions to the same dose of 1.5×1016 He ions/cm2. The refractive index distribution of the double waveguide in the NdLiP4O12 laser crystal is given based on the reflectivity calculation method. [Copyright &y& Elsevier]

Published
2005
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