Laser Amplification Mechanism in an Nd3+-Doped Polymer Optical Fibre

• 来源期刊: 中国物理快报
• 学科: 物理学
• 年，卷（期）: 2001,（10）
• 所属期刊栏目: ATOMIC AND MOLECULAR PHYSICS
• 页码范围: 1337-1340
• 页数: 4页
• 分类号: O4
• 语种: 英文

摘要

The Judd-Ofelt theory was applied to optical-absorption transitions in an Nd3+-doped polymer opticalfibre to obtain the intensity parameters (Ω2 ＝ 0.83 x 10-2o cm2, 4 ＝ 1.64 x 10-20 cm2, Ω6 ＝ 4.04 x 10-20 cm2), the radiative lifetime (371 μs) and the quantum efficiency (0.73) of the 4G5/2level, from which we found tlat the transition probability from 4G5/2 to 4I9/2 (Aij ＝ 1995.7s-1) is higher than others. Thus, in the polymer system, the traditional four-level laser system for Nd3+ was substituted by a three-level system. Furthermore, we have calculated the emission cross section (σeij = 2.45 × 10-21 cm2), and solved the differential equations of the single-pass gain. In comparison with inorganic opticalfibres, an increased saturated intensity is observed.