Liqing Ren

Liqing Ren
Yulin College · College of Energy Engineering

PhD

About

18
Publications
2,202
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119
Citations
Introduction
Skills and Expertise
Education
October 2014 - January 2020
Weizmann Institute of Science
Field of study
  • Nonlinear Optics

Publications

Publications (18)
Article
As a nonlinear optical effect, the second harmonic generation (SHG) has a wide range of applications in obtaining information such as material composition, structure, and properties due to its good polarization sensitivity. Although SHG spectroscopy or SHG microscopy has been used to explore the precise positioning or tracking of nanowires, there a...
Article
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A distribution network in supply chain management increases product reachability and handling density across different warehouses and customers. Relays in the distribution network prevent congestion, supply stagnancy, and delayed deliveries. Protecting the relay functions and streamlining them are tedious due to the varying vehicle and goods densit...
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We report a thermal-light “ghost” imaging without conventional intensity correlation calculation. Typically, ghost imaging is achieved with correlation calculation not only for entangled photons but also for thermal-light sources. In this paper, we set only thresholds for the bucket detector and the reference detector, and count the realizations wh...
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Four-wave-mixing microscopy is widely researched in both biology and medicine. In this paper, we present a simplified near-degenerate four-wave-mixing microscopy (SNDFWM). An ultra-steep long-pass filter is utilized to produce an ultra-steep edge on the spectrum of a femtosecond pulse, and a super-sensitive four-wave-mixing (FWM) signal can be gene...
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Low frequency Raman spectroscopy resolves the slow vibrations resulting from collective motions of molecular structures. This frequency region is extremely challenging to access via other multidimensional methods such as 2D-IR. In this paper, we describe a new scheme which measures 2D Raman spectra in the low frequency regime. We separate the pulse...
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Coherent anti-Stokes Raman scattering (CARS) microscopy is becoming a more common tool in biomedical research. High-speed CARS microscopy has important applications in live cell imaging and in label-free pathology. However, only a few realizations exist of CARS imaging applied in the few terahertz spectral range (<300 cm⁻¹), in which much is unknow...
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Coherent anti-Stokes Raman scattering (CARS) has found wide applications in biomedical research. Compared with alternatives, single-beam CARS is especially attractive at low frequencies. Yet, currently existing schemes necessitate a relatively complicated setup to perform high-resolution spectroscopy. Here we show that the spectral sharp edge forme...
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Vibrational spectroscopic imaging is useful and important in biological and medical studies. Yet, vibrational imaging in the terahertz region ( < 300 cm − 1 ) under biologically relevant conditions is currently unavailable, as none of the available methods possesses a sufficient sensitivity and high spatial resolution at the same time. Here, we dev...
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Stimulated Raman scattering (SRS) has recently become useful for chemically selective bioimaging. It is usually measured via modulation transfer from the pump beam to the Stokes beam. Impulsive stimulated Raman spectroscopy, on the other hand, relies on the spectral shift of ultrashort pulses as they propagate in a Raman active sample. This method...
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Coherent anti-Stokes Raman scattering (CARS) spectroscopy and microscopy have many potential applications in biology and medicine. Among many variants of the technique itself, the method of single-pulse CARS spectroscopy and microscopy is attractive for its simplicity and quick implementation. Single-pulse CARS microscopy can be performed by shapin...
Article
We have investigated the vibrational sensitivity of a horizontal-mounted spherical reference cavity, which can be applied to develop an ultra-stable laser. Effects of different magnitudes of height and area as well as acceleration of the cavity support points on the length variation of the cavity are studied. When the cavity support points are tota...
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Based on the dressed state formalism, we obtain the adiabatic criterion of the sum frequency conversion. We show that this constraint restricts the energy conversion between the two dressed fields, which are superpositions of the signal field and the sum frequency field. We also show that the evolution of the populations of the dressed fields, whic...
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We investigate the interaction between a two-level atomic system and a phase controllable light field. The quantum diffraction of the population probability for the excited state is described analytically. The physical sense of the wave function evolution is analyzed in detail. The polarization of the atoms is shown with the help of Cornu spiral of...
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Based on the principle of the photoelectron imaging spectrometry, taking sodium atoms as an example, the characters of the photoelectrons angular distribution and the interference effect , which are produced from double-level of the D state of the atomic sodium, are investigated analytically by using the two-photon resonance and three-photon ioniza...
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The transition of a two-level system driven by a linearly weak chirped pulse is studied. Under the first order perturbation approximation, an analytical expression of the population probability is obtained, which is similar to the one describing Fresnel diffraction by a straight edge. It is shown that the population oscillation results from the dif...

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