In the process of power scaling large-area Quantum Cascade Lasers(QCLs),challenges such as degradation of beam quality and emission of multilobed far-field modes are frequently encountered.These issues become particul...In the process of power scaling large-area Quantum Cascade Lasers(QCLs),challenges such as degradation of beam quality and emission of multilobed far-field modes are frequently encountered.These issues become particularly pronounced with an increase in ridge width,resulting in multimode problems.To tackle this,an innovative multi ridge waveguide structure based on the principle of supersymmetry(SUSY)was proposed.This structure comprises a wider main waveguide in the center and two narrower auxiliary waveguides on either side.The high-order modes of the main waveguide are coupled with the modes of the auxiliary waveguides through mode-matching design,and the optical loss of the auxiliary waveguides suppresses these modes,thereby achieving fundamental mode lasing of the wider main waveguide.This paper employs the finite difference eigenmode(FDE)method to perform detailed structural modeling and simulation optimization of the 4.6μm wavelength quantum cascade laser,successfully achieving a single transverse mode QCL with a ridge width of 10μm.In comparison to the traditional single-mode QCL(with a ridge width of about 5μm),the MRW structure has the potential to increase the gain area of the laser by 100%.This offers a novel design concept and methodology for enhancing the single-mode luminous power of mid-infrared quantum cascade lasers,which is of considerable significance.展开更多
研究了一种基于高速图像采集与处理的多发光目标跟踪技术。采用现场可编程门阵列(FPGA)形成高速Camera Link CMOS相机的图像采集与实时处理系统。通过对图像数据进行开窗、求重心等算法处理,实现对多发光目标的跟踪,并搭建由直流电机驱...研究了一种基于高速图像采集与处理的多发光目标跟踪技术。采用现场可编程门阵列(FPGA)形成高速Camera Link CMOS相机的图像采集与实时处理系统。通过对图像数据进行开窗、求重心等算法处理,实现对多发光目标的跟踪,并搭建由直流电机驱动、具有两个LED光源的发光靶标进行跟踪测试。测试结果表明:相机输出帧频100 Hz时,运动目标相对于相机角速度达1.93 rad/s,仍可实时跟踪。系统的跟踪能力正比于相机帧频。展开更多
基金Supported by the National Natural Science Foundation of China(62105039)。
文摘In the process of power scaling large-area Quantum Cascade Lasers(QCLs),challenges such as degradation of beam quality and emission of multilobed far-field modes are frequently encountered.These issues become particularly pronounced with an increase in ridge width,resulting in multimode problems.To tackle this,an innovative multi ridge waveguide structure based on the principle of supersymmetry(SUSY)was proposed.This structure comprises a wider main waveguide in the center and two narrower auxiliary waveguides on either side.The high-order modes of the main waveguide are coupled with the modes of the auxiliary waveguides through mode-matching design,and the optical loss of the auxiliary waveguides suppresses these modes,thereby achieving fundamental mode lasing of the wider main waveguide.This paper employs the finite difference eigenmode(FDE)method to perform detailed structural modeling and simulation optimization of the 4.6μm wavelength quantum cascade laser,successfully achieving a single transverse mode QCL with a ridge width of 10μm.In comparison to the traditional single-mode QCL(with a ridge width of about 5μm),the MRW structure has the potential to increase the gain area of the laser by 100%.This offers a novel design concept and methodology for enhancing the single-mode luminous power of mid-infrared quantum cascade lasers,which is of considerable significance.
文摘研究了一种基于高速图像采集与处理的多发光目标跟踪技术。采用现场可编程门阵列(FPGA)形成高速Camera Link CMOS相机的图像采集与实时处理系统。通过对图像数据进行开窗、求重心等算法处理,实现对多发光目标的跟踪,并搭建由直流电机驱动、具有两个LED光源的发光靶标进行跟踪测试。测试结果表明:相机输出帧频100 Hz时,运动目标相对于相机角速度达1.93 rad/s,仍可实时跟踪。系统的跟踪能力正比于相机帧频。
