A Kerr-lens mode-locked laser, utilizing an Yb3+-doped disordered calcium lithium niobium gallium garnet (YbCLNGG) crystal, is detailed in this report. The YbCLNGG laser, pumped by a single-mode Yb fiber laser at 976nm, produces soliton pulses as short as 31 femtoseconds at a wavelength of 10568nm, characterized by an average output power of 66 milliwatts and a pulse repetition rate of 776 megahertz, employing soft-aperture Kerr-lens mode-locking. Using a pump power absorption of 0.74 watts, a Kerr-lens mode-locked laser produced 203 milliwatts of maximum output power, corresponding to 37 femtosecond pulses, which were slightly elongated. This equates to a peak power of 622 kilowatts and an optical efficiency of 203 percent.
Hyperspectral LiDAR echo signals, visualized in true color, have become a focal point of academic research and commercial applications, thanks to the progress in remote sensing technology. Spectral-reflectance data is lost in some channels of the hyperspectral LiDAR echo signal due to the emission power limitation of the hyperspectral LiDAR. Color reconstruction from the hyperspectral LiDAR echo signal is practically guaranteed to exhibit substantial color casts. Miransertib price An adaptive parameter fitting model-based spectral missing color correction approach is presented in this study for the resolution of the existing problem. Miransertib price Recognizing the known missing segments within the spectral reflectance bands, colors from incomplete spectral integration are modified to accurately reproduce the target colors. Miransertib price The experimental data clearly shows that the proposed color correction model, when applied to hyperspectral color blocks, produces a smaller color difference than the ground truth, thus enhancing image quality and facilitating the accurate reproduction of the target color.
The present paper explores steady-state quantum entanglement and steering phenomena in an open Dicke model, encompassing cavity dissipation and individual atomic decoherence. Due to the independent dephasing and squeezing environments connected to each atom, the commonly employed Holstein-Primakoff approximation fails to hold. In studying quantum phase transitions within decohering environments, we mainly find: (i) In both normal and superradiant phases, cavity dissipation and individual atomic decoherence boost entanglement and steering between the cavity field and the atomic ensemble; (ii) individual atomic spontaneous emission establishes steering between the cavity field and the atomic ensemble, but the steering in opposite directions is not concurrent; (iii) the maximum achievable steering within the normal phase is greater than in the superradiant phase; (iv) the entanglement and steering between the cavity output field and the atomic ensemble are considerably stronger than those with the intracavity field, and simultaneous steering in two directions is achievable even with the same parameters. Individual atomic decoherence processes within the open Dicke model are found to generate unique characteristics of quantum correlations, as our findings demonstrate.
Limited resolution in polarized images makes it difficult to extract precise polarization information, impeding the detection of subtle targets and signals. The polarization super-resolution (SR) method presents a possible way to deal with this problem, with the objective of generating a high-resolution polarized image from a low-resolution one. Traditional intensity-mode image super-resolution (SR) algorithms are less demanding than polarization-based SR. Polarization SR, however, necessitates not only the joint reconstruction of intensity and polarization information but also the inclusion of numerous channels and their intricate, non-linear relationships. Using a deep convolutional neural network, this paper addresses polarization image degradation by proposing a method for polarization super-resolution reconstruction, based on two degradation models. The well-designed loss function, in conjunction with the network structure, has been validated as successfully balancing intensity and polarization restoration, enabling super-resolution with a maximum scaling factor of four. The empirical data confirm the proposed method's superiority over other super-resolution methods, evident in both quantitative and visual assessments of two degradation models employing diverse scaling factors.
We present in this paper, for the first time, an analysis of the nonlinear laser operation in an active medium constructed from a parity-time (PT) symmetric structure located inside a Fabry-Perot (FP) resonator. The FP mirrors' reflection coefficients and phases, the period of the PT's symmetric structure, the number of primitive cells, and the saturation behavior of gain and loss are all factors considered in the presented theoretical model. Employing the modified transfer matrix method, laser output intensity characteristics are ascertained. Data from numerical modeling suggests that different output intensity levels can be produced by selecting the appropriate mirror phase configuration of the FP resonator. Subsequently, a particular value for the ratio of the grating period to the working wavelength leads to the bistable effect phenomenon.
By a method developed in this study, sensor responses were simulated and the effectiveness of spectral reconstruction verified by a spectrum-variable LED system. Multiple camera channels, as highlighted by research, can augment the precision and accuracy of spectral reconstruction. However, practical sensor fabrication and verification, particularly those with precisely designed spectral sensitivities, were remarkably challenging tasks. Consequently, a prompt and trustworthy validation system was preferred when carrying out the evaluation. The current study proposes two innovative simulation strategies, channel-first and illumination-first, for duplicating the designed sensors with the aid of a monochrome camera and a spectrum-tunable LED illumination system. An RGB camera's channel-first method involved theoretical optimization of three extra sensor channels' spectral sensitivities, followed by simulation matching of the LED system's corresponding illuminants. Employing the illumination-first approach, the LED system's spectral power distribution (SPD) was optimized, and the additional channels were subsequently identified. Empirical testing confirmed the effectiveness of the proposed methods in modeling the reactions of extra sensor channels.
High-beam quality 588nm radiation resulted from the frequency doubling of a crystalline Raman laser. The laser gain medium, a bonding crystal structure of YVO4/NdYVO4/YVO4, enables more rapid thermal diffusion. For intracavity Raman conversion, a YVO4 crystal was employed; for the second harmonic generation, an LBO crystal was employed. Using 492 watts of incident pump power and a 50 kHz pulse repetition frequency, the 588-nm laser produced 285 watts of power. This 3-nanosecond pulse corresponds to a diode-to-yellow laser conversion efficiency of 575% and a slope efficiency of 76%. Simultaneously, the pulse's energy output measured 57 Joules, while its peak power reached 19 kilowatts. Within the V-shaped cavity, the excellent mode matching, coupled with the self-cleaning effect of Raman scattering, successfully neutralized the severe thermal effects of the self-Raman structure. Consequently, the beam quality factor M2 was substantially enhanced, achieving optimal values of Mx^2 = 1207 and My^2 = 1200, at an incident pump power of 492 W.
Our 3D, time-dependent Maxwell-Bloch code, Dagon, is used in this article to demonstrate lasing in nitrogen filaments without cavities. This previously used code, intended for modeling plasma-based soft X-ray lasers, has been repurposed for simulating lasing behavior within nitrogen plasma filaments. Predictive capabilities of the code were assessed via multiple benchmarks, using experimental and 1D modelling results as a point of comparison. Following the preceding step, we examine the amplification of an externally introduced UV beam in nitrogen plasma filaments. The phase of the amplified beam mirrors the temporal course of amplification and collisions, providing insight into the dynamics within the plasma, as well as information about the amplified beam's spatial pattern and the active area of the filament. We have determined that a methodology employing phase measurements of an ultraviolet probe beam, complemented by 3D Maxwell-Bloch modeling, may be an optimal means for evaluating electron density values and gradients, the average ionization level, the density of N2+ ions, and the force of collisional events occurring within the filaments.
We report, in this article, the modeling outcomes for the amplification of orbital angular momentum (OAM)-carrying high-order harmonics (HOH) in plasma amplifiers, using krypton gas and solid silver targets. In characterizing the amplified beam, its intensity, phase, and breakdown into helical and Laguerre-Gauss modes are considered. The amplification process, while preserving OAM, still exhibits some degradation, as the results indicate. The intensity and phase profiles demonstrate diverse structural arrangements. The plasma's self-emission, combined with refraction and interference, has been correlated with these structures, as shown by our model. Subsequently, these outcomes not only reveal the effectiveness of plasma amplifiers in generating amplified beams incorporating orbital angular momentum but also indicate the feasibility of utilizing beams carrying orbital angular momentum as probes to analyze the evolution of heated, dense plasmas.
Large-scale, high-throughput production of devices with outstanding ultrabroadband absorption and high angular tolerance is crucial for applications in thermal imaging, energy harvesting, and radiative cooling. Despite prolonged dedication to design and creation, the unified attainment of all these desired properties has posed a considerable obstacle. An infrared absorber, based on metamaterials and constructed from epsilon-near-zero (ENZ) thin films, is created on metal-coated patterned silicon substrates. Ultrabroadband absorption in both p- and s-polarization is achieved across incident angles from 0 to 40 degrees.
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