Enhancement of Cr4+ Concentration in Y3Al5O12 Crystal Fiber by Pregrowth Perimeter Deposition
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概要
- 論文の詳細を見る
Chromium ions tend to diffuse outward during the laser-heated pedestal growth (LHPG) of Y3Al5O12 (YAG) crystal fiber, in which the average Cr4+ ion concentration decreases significantly after each diameter-reduction step. The Cr4+ ions are replenished using an electron gun to deposit Cr2O3 and divalent-ion oxide (CaO or MgO) on the source rod circumference before LHPG. It was observed that Ca2+ has better efficiency to diffuse into the source rod more efficiently than Mg2+ generating fewer defects and stacking faults. By CaO deposition and post growth annealing at 1350 °C under an oxygen environment, a 110% increase in Cr4+ concentration was obtained. The achieved Cr4+ concentration and the ratio of Cr4+ to total Cr were $1.76\times 10^{18}$ cm-3 and 5.5, respectively. The Ca,Cr:YAG crystal fiber can thus be used as an ultra broadband laser material and amplified spontaneous emitter.
- 2008-08-25
著者
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LIN Yen-Sheng
Department of Mechanical Engineering, Chung Cheng Institute of Technology
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Huang Sheng-lung
Institute Of Electro-optical Engineering National Sun Yat-sen University
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Lai Chien-Chih
Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan
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Lai Chien-Chih
Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan, R.O.C.
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Tsai Cheng-Nan
Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan, R.O.C.
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Lin Yen-Sheng
Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan, R.O.C.
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Huang Kuang-Yao
Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan, R.O.C.
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Lin Yen-Sheng
Department of Electronic Engineering, I-Shou University, Kaohsiung 840, Taiwan, R.O.C.
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Lin Yen-Sheng
Department of Electronic Engineering, I-Shou University, Kaohsiung 840, Taiwan
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Lai Chien-Chih
Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, R.O.C.
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