检索结果-内蒙古大学图书馆

Spectrally uncorrelated biphotons generated from "the family of BBO crystal"

学校读者我要写书评

暂无评论

Quantum Engineering

Quantum Engineering 2020年第2期2卷

作者： Jin, Rui-Bo Cai, Wu-Hao Ding, Chunling Mei, Feng Deng, Guang-Wei Shimizu, Ryosuke Zhou, Qiang Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Shanxi University Taiyuan China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan China Institute of Fundamental and Frontier Sciences and School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei China The University of Electro-Communications Chofu Japan

Spectrally intrinsically uncorrelated biphoton states generated from nonlinear crystals are very important but rare resources for quantum photonics and quantum information applications. Previously, such biphoton states were generated from several kinds of crystals, however, their wavelength ranges and nonlinear efficiencies were still limited for various applications. In order to explore new crystal for wider wavelength range and higher nonlinear efficiency, here we theoretically study the generation of spectrally uncorrelated biphoton states from 14 crystals in the "BBO family," including BBO, CLBO, KABO, KBBF, RBBF, CBBF, BABF, BiBO, LBO, CBO, LRB4, LCB, YCOB, and GdCOB. They satisfy three kinds of group-velocity matching condition from near-infrared to telecom wavelengths. Furthermore, heralded single photons can be generated with a purity as high as 0.98, which is achieved without any narrow filtering. The indistinguishability of photons from independent sources is examined by the Hong-Ou-Mandel interference, which results in a visibility of 98% also without any further filtering, that is, photons from different heralded single-photon sources are highly indistinguishable. Our study may provide single-photon sources with good performance for quantum information processing at near-infrared and telecom wavelengths. © 2020 John Wiley & Sons, Ltd.

关键词： Photons

Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: A theoretical investigation

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Wei, Bei Cai, Wu-Hao Ding, Chunling Deng, Guang-Wei Shimizu, Ryosuke Zhou, Qiang Jin, Rui-Bo Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Institute of Fundamental and Frontier Sciences School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo Japan State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan030006 China

We theoretically investigate the preparation of mid-infrared (MIR) spectrally-uncorrelated biphotons from a spontaneous parametric down-conversion process using doped LN crystals, including MgO doped LN, ZnO doped LN, and In2O3 doped ZnLN with doping ratio from 0 to 7 mol%. The tilt angle of the phase-matching function and the corresponding poling period are calculated under type-II, type-I, and type-0 phase-matching conditions. We also calculate the thermal properties of the doped LN crystals and their performance in Hong-Ou-Mandel interference. It is found that the doping ratio has a substantial impact on the group-velocity-matching (GVM) wavelengths. Especially, the GVM2 wavelength of co-doped InZnLN crystal has a tunable range of 678.7 nm, which is much broader than the tunable range of less than 100 nm achieved by the conventional method of adjusting the temperature. It can be concluded that the doping ratio can be utilized as a degree of freedom to manipulate the biphoton state. The spectrally uncorrelated biphotons can be used to prepare pure single-photon source and entangled photon source, which may have promising applications for quantum-enhanced sensing, imaging, and communications at the MIR range. Copyright © 2020, The Authors. All rights reserved.

关键词： Infrared devices

Determination of electron band structure using temporal interferometry

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Li, Liang Lan, Pengfei He, Lixin Cao, Wei Zhang, Qingbin Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

We propose an all optical method to directly reconstruct the band structure of semiconductors. Our scheme is based on the temporal Young’s interferometer realized by high harmonic generation (HHG) with a few-cycle laser pulse. As a time-energy domain interferometric device, temporal interferometer encodes the band structure into the fringe in the energy domain. The relation between the band structure and the emitted harmonic frequencies is established. This enables us to retrieve the band structure from the HHG spectrum with a single-shot measurement. Our scheme paves the way to study matters under ambient conditions and to track the ultrafast modification of band structures. Copyright © 2019, The Authors. All rights reserved.

关键词： Band structure

Spectrum Manipulation for Sound with Effective Gauge Fields in Cascading Temporally Modulated Waveguides

学校读者我要写书评

暂无评论

Physical Review Applied 2019年第6期11卷 064012-064012页

作者： Chengzhi Qin Yugui Peng Ying Li Xuefeng Zhu Bing Wang Cheng-Wei Qiu Peixiang Lu School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Department of Electrical and Computer Engineering National University of Singapore Singapore 119620 Singapore Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China

Spectrum is a basic dimension of waves ranging from electromagnetic to acoustic waves where information can be encoded and multiplexed. The manipulation of the sound spectrum is desirable in applications of acoustic communication and voice encryption, which, however, is challenging to realize. Here, based on temporally modulated waveguides, we create effective gauge fields to generate frequency domain Bloch oscillations (FBOs) to control the spectrum of sound. The modulation can induce mode transitions in the waveguide band and form a discrete frequency lattice where the wave vector mismatch during transitions acts as an effective electric field that drives FBOs. Furthermore, we find the modulation phase accompanying transitions serves as an effective gauge potential that can control the initial oscillation phase. We report that multiple FBOs with judiciously designed oscillation phases can be further cascaded to realize acoustic spectrum reconstruction, unidirectional transduction, and bandwidth engineering. This study reveals the significance of gauge fields in FBOs and functionalizes its cascaded configurations for advanced control of the sound spectrum. This paradigm may find versatile applications in acoustic secure communication, information encryption, and processing.

关键词： Acoustic signal processing & noise Acoustic wave phenomena Elastic modulus Geometric & topological phases Synthetic gauge fields Waveguides Bloch wave theory

All-optical frequency resolved optical gating for isolated attosecond pulse reconstruction

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Yang, Zhen Cao, Wei Chen, Xi Zhang, Jie Mo, Yunlong Xu, Huiyao Mi, Kang Zhang, Qingbin Lan, Pengfei Lu, Peixiang Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

We demonstrate an all-optical approach for precise characterization of attosecond extreme ultraviolet pulses. Isolated attosecond pulse is produced from high order harmonics using intense driving pulse with proper gating technique. When a weak field is synchronized with the driver, it perturbs the harmonics generation process via altering the accumulated phase of the electron trajectories. The perturbed harmonic spectrum can be formulated as a convolution of the unperturbed dipole and a phase gate, implying the validity of complete reconstruction of isolated attosecond pulses using conventional frequency resolved optical gating method. This in situ measurement avoids the central momentum approximation assumed in the widely used attosecond streaking measurement, providing a simple and reliable metrology for isolated attosecond pulse. Copyright © 2019, The Authors. All rights reserved.

关键词：

Photoelectron holographic interferometry to probe the longitudinal momentum offset at the tunnel exit

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Li, Min Xie, Hui Cao, Wei Luo, Siqiang Tan, Jia Feng, Yudi Du, Baojie Zhang, Weiyu Li, Yang Zhang, Qingbin Lan, Pengfei Zhou, Yueming Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

Laser-induced electron tunneling underlies numerous emerging spectroscopic techniques to probe attosecond electron dynamics in atoms and molecules. The improvement of those techniques requires an accurate knowledge of the exit momentum for the tunneling wave packet. Here we demonstrate a photoelectron interferometric scheme to probe the electron momentum longitudinal to the tunnel direction at the tunnel exit by measuring the photoelectron holographic pattern in an orthogonally polarized two-color laser pulse. In this scheme, we use a perturbative 400-nm laser field to modulate the photoelectron holographic fringes generated by a strong 800-nm pulse. The fringe shift offers a direct experimental access to the intermediate canonical momentum of the rescattering electron, allowing us to reconstruct the momentum offset at the tunnel exit with high accuracy. Our result unambiguously proves the existence of nonzero initial longitudinal momentum at the tunnel exit and provides fundamental insights into the non-quasi-static nature of the strong-field tunneling. Copyright © 2019, The Authors. All rights reserved.

关键词： Photons

Molecular rotation movie filmed with high-harmonic generation

学校读者我要写书评

暂无评论

arXiv 2019年

作者： He, Yanqing He, Lixin Lan, Pengfei Wang, Baoning Li, Liang Zhu, Xiaosong Cao, Wei Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

Direct imaging of molecular dynamics is a long-standing goal in physics and chemistry. As an emerging tool, high-harmonic spectroscopy (HHS) enables accessing molecular dynamics on femtosecond to attosecond time scales. However, decoding information from the harmonic signals is usually painstaking due to the coherent nature of high-harmonic generation (HHG). Here we show that this obstacle can be effectively overcome by exploiting machine learning in HHS. Combining the machine learning with an angle-resolved HHS method, we demonstrate that the rich dynamics of molecular rotational wave packet is fully reconstructed from the angular distributions of HHG measured at various time delays of the probe pulse. The experimental retrievals are in good agreement with the numerical simulations. These findings provide a comprehensive picture of molecular rotation in space and time which will facilitate the development of related researches on molecular dynamics imaging. Copyright © 2019, The Authors. All rights reserved.

关键词： Molecular dynamics

All-optical measurement of high-order fractional molecular echoes by high-order harmonic generation

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Wang, Baoning He, Lixin He, Yanqing Zhang, Yinfu Shao, Renzhi Lan, Pengfei Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

An all-optical measurement of high-order fractional molecular echoes is demonstrated by using high-order harmonic generation (HHG). Excited by a pair of time-delayed short laser pulses, the signatures of full and high order fractional (1/2 and 1/3) alignment echoes are observed in the HHG signals measured from CO2 molecules at various time delays of the probe pulse. By increasing the time delay of the pump pulses, much higher order fractional (1/4) alignment echo is also observed in N2O molecules. With an analytic model based on the impulsive approximation, the spatiotemporal dynamics of the echo process are retrieved from the experiment. Compared to the typical molecular alignment revivals, high-order fractional molecular echoes are demonstrated to dephase more rapidly, which will open a new route towards the ultrashort-time measurement. The proposed HHG method paves an efficient way for accessing the high-order fractional echoes in molecules. Copyright © 2019, The Authors. All rights reserved.

关键词： optical data processing

Wave-front controlled attosecond time domain interferometry

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Yang, Zhen Cao, Wei Mo, Yunlong Xu, Huiyao Mi, Kang Lan, Pengfei Zhang, Qingbin Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

Interferometry, as the key technique in modern precision measurements, has been used for length diagnosis in the fields of engineering metrology and astronomy. Analogous interferometric technique for time domain precision measurement is a significant complement to the spatial domain applications and requires the manipulation of the interference on the extreme time and energy scale. Here we present an all-optical interferometry for high precision measurement with attosecond temporal and hundreds of meV energy resolution. The interferometer is based on laser driven high order harmonics which provide a robust sequence of attosecond temporal slits. As applications, we reconstruct the waveform of an arbitrarily polarized optical pulse using the time resolving capability, and capture the abnormal character of the transition dipole near a Cooper minimum in argon using the energy resolution provided. This novel attosecond interferometry opens the possibility for high precision measurement in time energy domain using an all-optical approach. Copyright © 2019, The Authors. All rights reserved.

关键词： Interferometry