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根据掺铒波导光放大理论和耦合器传输矩阵,建立了描述掺铒波导环形腔激光器的理论模型,在此基础上分析了环形腔弯曲半径、耦合器耦合系数和掺铒离子浓度等因素对泵浦阈值和激射光输出特性的影响.结果表明由于受到波导弯曲损耗和其他机制损耗的共同作用,存在一优化弯曲半径使得波导环形腔激光器在较低阈值泵浦功率下实现较高的斜率效率;激射光输出耦合器作为激光谐振腔损耗的一部分,其耦合系数的大小影响到激光器的特性,在耦合系数为0.2附近处可获得较高的激射光输出功率;铒离子掺杂浓度在0.85×1026m?3时具有最低的阈值泵浦功率,在不引起明显上转换效应的条件下,适当的增加铒离子浓度可以提高激射光波的输出功率.研究结果为掺铒波导环形腔激光器的设计和制作提供了理论依据.
According to the optical amplification theory of erbium-doped waveguides and the coupler transmission matrix, a theoretical model describing the erbium-doped waveguide ring cavity laser is established. Based on this, the factors such as the bending radius of the ring cavity, the coupler coupling coefficient and the erbium ion concentration are analyzed. The results show that due to the combined effect of waveguide bending loss and other mechanism losses, there is an optimal bend radius that enables the waveguide ring cavity laser to achieve higher slope efficiency at lower threshold pump power. As a part of the laser cavity loss, the laser output coupler affects the characteristics of the laser. The laser output power can be obtained at a coupling coefficient of about 0.2. The doping concentration of erbium ion is about 0.85 × 1026 m With the lowest threshold pump power of 3, the erbium ion concentration can increase the output power of lasing light without any obvious up-conversion effect.The research results are as follows: Design and fabrication of erbium-doped ring cavity laser Provided a theoretical basis.