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功率型白光LED的非线性混合调光方法 被引量:5
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作者 周锦荣 《发光学报》 EI CAS CSCD 北大核心 2017年第9期1249-1255,共7页
分析脉冲宽度调制(PWM)双通道输出白光LED的混合调光方法,建立PWM与混合光源输出的光通量和色温之间变化关系的非线性数学模型。基于Zig Bee无线通信模块CC2530作为双路PWM输出,控制以SN3350为核心的LED恒流驱动电源,完成占空比可调的... 分析脉冲宽度调制(PWM)双通道输出白光LED的混合调光方法,建立PWM与混合光源输出的光通量和色温之间变化关系的非线性数学模型。基于Zig Bee无线通信模块CC2530作为双路PWM输出,控制以SN3350为核心的LED恒流驱动电源,完成占空比可调的暖白和冷白两路白光LED的色温和光通量混合调光控制系统设计,并通过高精度快速光谱辐射计HAAS-2000测试系统进行测试。实验结果表明,双路PWM能够较好地实现对LED色温和光通量的输出大小进行控制,混合光源相关色温在3 250~15 000 K范围内连续可调。理论计算与系统控制的光通量和色温存在的相对误差分别小于1.70%和8.50%。 展开更多
关键词 动态照明控制 LED混合 非线性调光 脉冲宽度
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A review on spatial self-phase modulation of two-dimensional materials 被引量:2
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作者 ZHANG Xue-jun YUAN Zhen-hua +4 位作者 YANG Rui-xin HE Yi-lin QIN Ying-lin XIAO Si HE Jun 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第9期2295-2306,共12页
Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve op... Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve optical switch.At present,the mechanism of SPPM is still ambiguous.The debate mainly focuses on whether the phenomenon is caused by the nonlinear refractive index of the two-dimensional material or the thermal effect of the laser.The lack of theory limits the dimension of the phase modulation to the radius of the diffraction ring and the vertical imbalance.Therefore,it is urgent to establish a unified and universal SSPM theoretical system of two-dimensional material. 展开更多
关键词 nonlinear optics spatial self-phase modulation two-dimensional materials
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Modulation instability of dispersion-shifted fiber couplers 被引量:1
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作者 ZHOU Yan-yong JIA Wei-guo +2 位作者 HAN Ying-ming YING Chun BAO Hong-mei 《Optoelectronics Letters》 EI 2008年第4期264-268,共5页
The nonlinear coupled-mode equations are rewritten by even and odd modes.We study modulation instability(MI) of dispersion-shifted fiber couplers when either even or odd mode is launched alone by using zero-dispersion... The nonlinear coupled-mode equations are rewritten by even and odd modes.We study modulation instability(MI) of dispersion-shifted fiber couplers when either even or odd mode is launched alone by using zero-dispersion wavelength relatively long(quasi-cw) pulses.The result shows that there are new types of MI in both the normal-dispersion and the anomalous-dispersion regimes.MI is concerned with forth-order dispersion and has no relation with third-order dispersion.Quasi-cw can be changed into pulses array under certain conditions.We can extract super short pulse from this.Furthermore,the bandwidth of gain spectra widens and its strength accretes as the input power increases. 展开更多
关键词 纤耦合器 非线性耦合方程 制不稳定性 学器件
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Nonlinear Liquid Crystal Polymer and Its Applications
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作者 SHI Yongji(Luoyang Technology College, Luoyang 471003,CHN) 《Semiconductor Photonics and Technology》 CAS 1996年第2期112-117,共6页
The transparent solid medium of a thermotropic liquid crystal polymer have a comb structure of mesogenic side chains which exhibit a nonlinear optical response of electronic origin.The main chain of the liquid crystal... The transparent solid medium of a thermotropic liquid crystal polymer have a comb structure of mesogenic side chains which exhibit a nonlinear optical response of electronic origin.The main chain of the liquid crystal polymers can be selected from a number of suitable polymerized monomeric and comonomeric structures such as polyvinyl,polysiloxane,polyoxyalkylene, polyester etc.The electrooptic light modulator is provided,which have potential to using in the systems of laser modulation and deflection,and information control in optical circuitry etc. 展开更多
关键词 Nonlinear Optics Liquid Crystal Polymer Electrooptic Light Modulator
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Quantum Computation with Nonlinear Optics
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作者 LIU Yang ZHANG Wen-Hong +1 位作者 ZHANG Cun-Lin LONG Gui-Lu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第1期107-110,共4页
We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operat... We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operation is implemented through optical elements like the Faraday polarization rotator. Photons are separated into different optical paths, or merged into a single optical path using dichromatic mirrors. The controlled-NOT gate between two qubits is implemented by the proper combination of parametric up and down conversions. This scheme has the following features: (1) No auxiliary qubits are required in the controlled-NOT gate operation; (2) No measurement is required in the course of the computation; (3) It is resource efficient and conceptually simple. 展开更多
关键词 quantum computation nonlinear optics parametric up(down)-conversion polarization modulator
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Solution processed MoS2-PVA composite for subbandgap mode-locking of a wideband tunable ultrafast Er:fiber laser 被引量:15
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作者 Meng Zhang Richard C. T. Howe +6 位作者 Robert I. Woodward Edmund J. R. Kelleher Felice Torrisi Guohua Hu Sergei V. Popov J. Roy Taylor Tawfique Hasan 《Nano Research》 SCIE EI CAS CSCD 2015年第5期1522-1534,共13页
We fabricate a free-standing few-layer molybdenum disulfide (MoS2)-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate a wideband tunable, ultrafast mode-lo... We fabricate a free-standing few-layer molybdenum disulfide (MoS2)-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate a wideband tunable, ultrafast mode-locked fiber laser. Stable, picosecond pulses, tunable from 1,535 nm to 1,565 nm, are generated, corresponding to photon energies below the MoS2 material bandgap. These results contribute to the growing body of work studying the nonlinear optical properties of transition metal dichalcogenides that present new opportunities for ultrafast photonic applications. 展开更多
关键词 molybdenum disulfide two-dimensional materials liquid phase exfoliation polymer composites saturable absorbers ultrafast lasers
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A dynamic optical arbitrary waveform generator based on cross phase modulation 被引量:1
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作者 张爱玲 贺家乐 《Optoelectronics Letters》 EI 2016年第2期101-105,共5页
In this paper, a dynamic optical arbitrary waveform generator(OAWG) based on cross phase modulation(XPM) is proposed. According to the characteristics of XPM, the nonlinear phase shift of signal can be changed along w... In this paper, a dynamic optical arbitrary waveform generator(OAWG) based on cross phase modulation(XPM) is proposed. According to the characteristics of XPM, the nonlinear phase shift of signal can be changed along with the pump power. The amplitude of signal can be changed by controlling the phase shift at one arm of a Mach-Zehnder interferometer(MZI) using XPM effect between signal and pump. Therefore, the phase and amplitude of the optical frequency comb(OFC) can be controlled by two pump arrays. As a result, different kinds of waveforms can be synthesized. Due to the ultrafast response of XPM, the generated waveform could be dynamically updated with an ultrafast frequency. The waveform fidelity is affected by the updating frequency. 展开更多
关键词 waveform generator arbitrary dynamically interferometer fidelity updated updating coherent utilizingwaveform generator arbitrary dynamically interferometer fidelity updated updating coherent utilizing
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