Decoupling composite modulation models in frequency-scanning interferometry for dynamic absolute ranging using a multi-synchrosqueezing transform.

We present a decoupling method for a composite modulation model in a simple frequency-scanning interferometry (FSI) scheme for dynamic absolute ranging. The method employs a multi-synchrosqueezing transform for data processing, enabling accurate and robust estimation of the instantaneous frequency and effective separation of target motion from the interference signal within the composite modulation model. Both simulations and experimental results demonstrate the proposed FSI scheme's superior dynamic ranging performance.

Laser heterodyne interferometry nano-displacement measurement based on an electro-optic modulation double sideband.

We propose a novel, to our knowledge, dual-frequency laser heterodyne interferometry nano-displacement measurement method utilizing electro-optic modulation (EOM) to generate double-sideband signals. Unlike conventional dual-frequency laser techniques, the proposed EOM based approach produces strictly symmetric double sidebands with suppressed polarization aliasing errors. By integrating optical digital coherent detection with an all-phase FFT (apFFT) fringe counting algorithm, we achieve nanoscale displacement estimation.

Glare suppression focusing method for high polarization purity focus generation.

When a light beam propagates through strongly scattering media, not only does its amplitude and phase distribution become scrambled, but its polarization state also becomes randomized. This depolarization effect imposes significant limitations on the applications of vector light fields in scattering environments. In this Letter, we propose a glare suppression-based method for achieving highly polarization-pure scattering light focusing.

Electrodeposition Preparation of Perovskite Solar Cells with an Efficiency Exceeding 19.

Electrodeposition-prepared perovskite solar cells have the advantages of simple preparation, low costs, large-area preparation, and compatibility with various preparation processes. This has resulted in great potential for the commercial preparation of perovskite solar cells. However, the efficiency of electrodeposition-prepared perovskite solar cells is very low, preventing further research.

Tracking the transmission matrix of a moving fiber with the transmitted data.

During data transmission, the dynamic change of a scattering medium will make the measured transmission matrix (TM) invalid, so it is necessary to repeatedly measure the TM to achieve a long-time data transmission, which requires stopping the data transmission process frequently to measure the TM and leads to a reduction in the communication capacity. To solve this problem, we propose a TM tracking method during data transmission. In the case of more than three discrete levels of phase modulation, this method can realize the calibration of the TM with the intensity pictures captured by the camera and the recovered data, so it does not require stopping the data transmission process to measure the TM and thus avoids the loss of communication capacity.

Multi-channel data transmission through a multimode fiber based on OAM phase encoding.

Data transmission based on the transmission matrix method has realized the multiplexing of a large number of orbital angular momentum (OAM) modes under scattering, which encodes the data by modulating the amplitude of the OAM modes. However, this amplitude modulation (amplitude encoding) method has obvious cross talk when the number of output modes is small, resulting in a non-negligible bit error rate. Here, a multi-channel data transmission method based on OAM phase modulation (phase encoding) under scattering is proposed.

Transmission matrix-based phase correction for optical systems.

The demands in fields such as biology and communications are driving the development of structured light. However, the optical modulation devices which play an important role in generating structured light, often introduce phase distortion. Additional phase correction is required to obtain more precise modulation capabilities.

Data transmission under high scattering based on OAM-basis transmission matrix.

Multiplexing of orbital angular momentum (OAM) channels is an important method to increase the optical communication capacity at present, but the multiple scattering and distortion of long-distance optical communication greatly limit its application. Here, a data transmission method based on an OAM-basis transmission matrix (TM) under high scattering is proposed. In this method, OAM modes are directly encoded by the OAM-basis TM, and the incident power spectral distribution of OAM modes can be directly acquired by the intensity profile of the speckle field on the camera.

Hybrid optimization algorithm based on neural networks and its application in wavefront shaping.

The scattering effect of turbid media can lead to optical wavefront distortion. Focusing light through turbid media can be achieved using wavefront shaping techniques. Intelligent optimization algorithms and neural network algorithms are two powerful types of algorithms in the field of wavefront shaping but have their advantages and disadvantages.

Large-scale, high-contrast glare suppression with low-transmittance eigenchannels of aperture-target transmission matrices.

Glare suppression with wavefront shaping is a significant technique in terms of actively controlling the speckle light field. A novel glare suppression method based on transmission matrix (TM) measurement is demonstrated in this Letter. An aperture-target TM model is proposed, and its low-transmittance eigenchannel is utilized to minimize the speckle intensity inside a given target area.

Self-reference method for measuring the transmission matrices of scattering media.

A significant approach for manipulating light propagation through scattering media consists of the measurement of transmission matrices (TMs). Here we propose a TM-measurement method with high stability and universal applicability, which we call the self-reference method. This method uses a new, to the best of our knowledge, way to perform holographic measurement, where the reference light is superimposed directly to the signal light.

OAM-basis transmission matrix in optics: a novel approach to manipulate light propagation through scattering media.

Transmission matrix (TM) is an ideal theoretical model describing light propagation through scattering media. Until now, most of the present TMs utilize the eigenstates of spatial position as input and output bases. Thus, they describe the relationship between the spatial distributions of two light fields.

Fluctuation initiation of Stokes signal and its effect on stimulated Brillouin scattering pulse compression.

In this paper, a theoretical model is developed to demonstrate that fluctuations in the Stokes signal and occurrence position contribute to the final compression ratio in stimulated Brillouin scattering (SBS). This theoretical analysis can be applied to the investigation of the temporal characteristics of SBS pulse compression. This model agrees well with the experimental results in a two-stage SBS compressor.

Generation of 360 ps laser pulse with 3 J energy by stimulated Brillouin scattering with a nonfocusing scheme.

A new technique for generating high energy sub-400 picosecond laser pulses is presented in this paper. The temporally super-Gaussian-shaped laser pulses are used as light source. When the forward pump is reflected by the rear window of SBS cell, the frequency component that fulfills Brillouin frequency shift in its sideband spectrum works as a seed and excites SBS, which results in efficient compression of the incident pump pulse.