Author Affiliations
Abstract
Key Laboratory of Optoelectronic Devices and Systems of Guangdong Province and Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518000, China
Nonlinear optics, which is a subject for studying the interaction between intense light and materials, has great impact on various research fields. Since many structures in biological tissues exhibit strong nonlinear optical effects, nonlinear optics has been widely applied in biomedical studies. Especially in the aspect of bio-imaging, nonlinear optical techniques can provide rapid, label-free and chemically specific imaging of biological samples, which enable the investigation of biological processes and analysis of samples beyond other microscopy techniques. In this review, we focus on the introduction of nonlinear optical processes and their applications in bio-imaging as well as the recent advances in this filed. Our perspective of this field is also presented.
nonliner optics microscopic imaging bio-imaging label-free chemical specific Opto-Electronic Advances
2020, 3(10): 10200003
华北电力大学 电子与通信工程系, 河北 保定 071003
基于射线光学和波动光学理论分析了多模光纤的布里渊散射特性, 提出了确定布里渊散射角取值范围的方法；推导了阶跃型和渐变型多模光纤不同模式群布里渊频移、线宽、散射谱和散射功率的表达式.结果表明, 阶跃型和渐变型多模光纤布里渊散射角的最大取值范围为全反射临界角的2倍到π；阶跃型光纤的布里渊频移、线宽、归一化峰值增益和散射功率随模式群的变化比渐变型光纤缓慢, 且随着模式群编号的增加, 阶跃型光纤的上述参量分别在11.084-10.932 GHz、21.760-21.168 MHz、1-0.933和1.990×10-9-1.857×10-9 W范围内呈曲线下降；渐变型光纤的上述参量分别在11.064-10.969 GHz、21.683-21.314 MHz、1-0.957和2.052×10-9-1.965×10-9 W范围内呈直线下降.
非线性光学 布里渊散射 射线光学 波动光学 多模光纤 布里渊散射角 不同模式 Nonliner optics Brillouin scattering Ray optics Wave optics Multimode optical fiber Brillouin scattering angle Different mode
1 湖南大学 信息科学与工程学院，微纳光电器件及应用教育部重点实验室，长沙 410082
2 长沙学院 电子与通信工程系，长沙 410003
研究了有限能量Airy光束在克尔介质中的非线性传输过程及整体自聚焦(特别是小尺度自聚焦)特性.研究发现相对于整体自聚焦，有限能量Airy光束主峰的小尺度自聚焦更容易发生，而且其噪音调制的增长速度随着截断系数的增加而变慢.通过对比研究不同截断系数小尺度自聚焦的增益谱，发现截断系数也极大地影响有限能量Airy光束的增益谱，截断系数越小Airy光束受噪音影响分裂的可能性就越大；对于较大的截断系数，有限能量Airy光束增益谱和由它主瓣拟合的高斯光束的增益谱越来越接近.研究结果对于有限能量Airy光束的潜在应用有一定的指导作用.
非线性光学 非线性薛定谔方程 自聚焦 无衍射光束 Airy光束 非线性传输 小尺度自聚焦 增益谱 Nonliner optics Nonlinear Schrdinger equation Self-focusing Non-diffracting beam Airy beam Nonlinear propagation Small-scale self-focusing Gain spectrum
