Author Affiliations
Abstract
1 GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
2 Central Laser Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, UK
We demonstrate high efficiency second harmonic generation (SHG) of near infrared femtosecond pulses using a $\text{BiB}_{3}\text{O}_{6}$ crystal in a single-pass tight focusing geometry setup. A frequency doubling efficiency of $63\%$ is achieved, which is, to the best of our knowledge, the highest value ever reported in the femtosecond regime for such low energy (nJ-level) pumping pulses. Theoretical analyses of the pumping scheme focusing waist and the SHG efficiency are performed, by numerically solving the three wave mixing coupled equations in the plane-wave scenario and by running simulations with a commercial full 3D code. Simulations show a good agreement with the experimental data regarding both the efficiency and the pulse spectral profile. The simulated SHG pulse temporal profile presents the characteristic features of the group velocity mismatch broadening in a ‘thick’ crystal.
nonlinear process second harmonic generation pumping scheme parametric amplification/oscillators high power laser High Power Laser Science and Engineering
2019, 7(1): 01000e11
Author Affiliations
Abstract
Photonics Lab, Department of Electronics and Communication Engineering, DIT University, Dehradun-248009, India
Plasmonic metal-insulator-metal (MIM) waveguides sustain excellent property of confining the surface plasmons up to a deep subwavelength scale. In this paper, linear and S-shaped MIM waveguides are cascaded together to design the model of Mach-Zehnder interferometer (MZI). Nonlinear material has been used for switching of light across its output ports. The structures of even and odd parity generators are projected by cascading the MZIs. Parity generator and checker circuit are used for error correction and detection in an optical communication system. Study and analysis of proposed designs are carried out by using the MATLAB simulation and finite-differencetime- domain (FDTD) method.
Plasmonics Plasmonics MIM waveguides MIM waveguides Mach-Zehnder interferometer Mach-Zehnder interferometer nonlinear process nonlinear process FDTD method FDTD method Photonic Sensors
2017, 7(2): 182
1 内蒙古电子信息职业技术学院, 内蒙古 呼和浩特010070
2 内蒙古大学 计算机学院, 内蒙古 呼和浩特010021
设计了在氮化镓材料上淀积周期光栅银薄膜的结构, 利用SPPs增强作用提高LED的发光效率。理论上建立了增强LED的内部发光效率、SPPs辐射匹配以及SPPs辐射衰减模型。实验结果表明: 淀积银薄膜的LED结构由于SPPs的增强可以显著提高出光效率; 出射光的偏振模式对LED出光效率没有影响; 金属光栅的吸收率在占空比达到0.87左右达到峰值; SPPs的增强作用可以显著改善弱光致发光的发光效率和非线性过程。这一研究对于LED发光效率的改进具有明显的理论和实际意义。
发光效率 SPPs增强 周期光栅 非线性过程 luminous efficiency SPPs enhancement periodic grating nonlinear process 红外与激光工程
2016, 45(7): 0720003
