The transformative potential of magnons for the next generation of information technology and quantum computing is undeniable. The state of magnons, unified through their Bose-Einstein condensation (mBEC), is a significant area of focus. mBEC formation is generally confined to the magnon excitation region. In a novel demonstration using optical methods, the enduring existence of mBEC, at distances far from the site of magnon excitation, is revealed for the first time. The mBEC phase exhibits a demonstrable degree of homogeneity. The experiments on yttrium iron garnet films, perpendicularly magnetized to the surface, were all performed at room temperature. To create coherent magnonics and quantum logic devices, we employ the methodology outlined in this article.
For the purpose of chemical specification identification, vibrational spectroscopy is instrumental. Spectra from sum frequency generation (SFG) and difference frequency generation (DFG), when considering the same molecular vibration, show delay-dependent disparities in corresponding spectral band frequencies. selleck chemical The frequency ambiguity observed in time-resolved SFG and DFG spectra, numerically analyzed using a frequency marker in the incident IR pulse, was attributed solely to the dispersion in the incident visible pulse, not to surface structural or dynamic fluctuations. Employing our findings, a beneficial approach for correcting discrepancies in vibrational frequencies is presented, thus improving the accuracy of spectral assignments for SFG and DFG spectroscopies.
A systematic examination of the resonant radiation from localized, soliton-like wave-packets in the cascading regime of second-harmonic generation is presented. selleck chemical A comprehensive mechanism is presented for the growth of resonant radiation, independent of higher-order dispersion, primarily through the action of the second-harmonic component, accompanied by the emission of radiation around the fundamental frequency via parametric down-conversion. The encompassing presence of this mechanism is highlighted through examination of different localized waves, including bright solitons (both fundamental and second-order), Akhmediev breathers, and dark solitons. A basic phase-matching condition is introduced to account for the radiated frequencies around such solitons, which is strongly supported by numerical simulations performed while varying material parameters (e.g., phase mismatch, dispersion ratio). The results expose the mechanism of soliton radiation in quadratic nonlinear media in a direct and unambiguous manner.
Two VCSELs, one biased and the other unbiased, positioned facing one another, provides a promising new methodology for generating mode-locked pulses, an advancement over the conventional SESAM mode-locked VECSEL. We formulate a theoretical model, using time-delay differential rate equations, and numerically validate that the dual-laser configuration exhibits the characteristics of a typical gain-absorber system. Current and laser facet reflectivities define a parameter space that showcases general trends in the nonlinear dynamics and pulsed solutions.
A reconfigurable ultra-broadband mode converter, comprising a two-mode fiber and a pressure-loaded phase-shifted long-period alloyed waveguide grating, is presented. We employ photo-lithography and electron beam evaporation for the design and fabrication of long-period alloyed waveguide gratings (LPAWGs), utilizing materials such as SU-8, chromium, and titanium. The TMF's reconfigurable mode conversion from LP01 to LP11, brought about by pressure-modulated LPAWG application or release, exhibits minimal dependence on the polarization state. A mode conversion efficiency exceeding 10 dB is attainable within a spectral range of approximately 105 nanometers, encompassing wavelengths from 15019 nanometers to 16067 nanometers. The proposed device's capabilities extend to applications in large bandwidth mode division multiplexing (MDM) transmission and optical fiber sensing systems that incorporate few-mode fibers.
Based on a dispersion-tunable chirped fiber Bragg grating (CFBG), we present a photonic time-stretched analog-to-digital converter (PTS-ADC), exhibiting an economical ADC system with seven different stretch factors. Different sampling points are attainable by tuning the stretch factors through modifications to the dispersion of CFBG. Hence, an improvement in the total sampling rate of the system is achievable. Only one channel is necessary to both increase the sampling rate and generate the multi-channel sampling effect. After various analyses, seven distinct clusters of sampling points were observed, each group corresponding to a specific range of stretch factors, from 1882 to 2206. selleck chemical The input radio frequency (RF) signals within the 2 GHz to 10 GHz spectrum were successfully retrieved. The sampling points are increased to 144 times their original value, and, correspondingly, the equivalent sampling rate is enhanced to 288 GSa/s. The proposed scheme's applicability extends to commercial microwave radar systems, which enable a substantially higher sampling rate at a relatively low cost.
Recent breakthroughs in ultrafast, high-modulation photonic materials have unlocked a multitude of new research opportunities. One particularly noteworthy instance is the prospect of photonic time crystals. From this standpoint, we present the most recent, significant advances in materials, potentially suited to photonic time crystals. We assess the worth of their modulation, taking into account the velocity and degree of modulation. We also scrutinize the hindrances that are still to be encountered and offer our estimations for prospective routes to success.
The significance of multipartite Einstein-Podolsky-Rosen (EPR) steering as a resource in quantum networks cannot be overstated. While EPR steering has been experimentally verified in spatially separated ultracold atomic systems, the construction of a secure quantum communication network demands deterministic control of steering among distant quantum network nodes. We describe a practical method for deterministically producing, storing, and manipulating one-way EPR steering between remote atomic cells, achieved through a cavity-aided quantum memory strategy. Faithfully storing three spatially separated entangled optical modes within three atomic cells creates a strong Greenberger-Horne-Zeilinger state, which optical cavities effectively use to suppress the unavoidable electromagnetic noises in electromagnetically induced transparency. The profound quantum correlation of atomic cells allows the establishment of one-to-two node EPR steering and, crucially, preserves the stored EPR steering in these quantum nodes. Subsequently, the temperature of the atomic cell has an active role in manipulating the steerability. This plan offers a direct reference point for the experimental realization of one-way multipartite steerable states, allowing the execution of an asymmetric quantum networking protocol.
We probed the optomechanical dynamics and quantum phase transitions of Bose-Einstein condensates constrained to a ring cavity. A semi-quantized spin-orbit coupling (SOC) is a consequence of the interaction of atoms with the running wave mode of the cavity field. The evolution of magnetic excitations within the matter field mirrors an optomechanical oscillator's trajectory through a viscous optical medium, exhibiting exceptional integrability and traceability, irrespective of atomic interactions. Moreover, the interplay of light atoms creates a sign-reversible long-range atomic interaction, fundamentally reshaping the usual energy structure of the system. Following these developments, a quantum phase with a high quantum degeneracy was observed in the transition region for SOC. Experimental results readily demonstrate the measurability of our scheme's immediate realizability.
We present, to the best of our knowledge, a novel interferometric fiber optic parametric amplifier (FOPA), which is designed to eliminate undesirable four-wave mixing products. Our simulations investigate two arrangements; the first rejects idler signals, and the second rejects non-linear crosstalk at the signal output port. The practical feasibility of suppressing idlers by over 28 decibels across a minimum of 10 terahertz, allowing for the reuse of the idler frequencies for signal amplification, is demonstrated through these numerical simulations, ultimately doubling the usable FOPA gain bandwidth. The attainment of this outcome is demonstrated, even when the interferometer includes real-world couplers, by the introduction of a small attenuation in a specific arm of the interferometer.
Control of far-field energy distribution is demonstrated using a femtosecond digital laser employing 61 tiled channels in a coherent beam. Individual pixels, represented by channels, permit separate control of amplitude and phase. Establishing a phase shift between neighboring fibers or fiber arrangements grants greater agility to the distribution of energy in the far field, propelling further investigation into phase patterns as a means to potentially optimize tiled-aperture CBC laser efficiency and dynamically shape the far field.
Two broadband pulses, a signal and an idler, are a result of optical parametric chirped-pulse amplification, and both are capable of generating peak powers higher than 100 GW. While the signal is frequently utilized, the compression of the longer-wavelength idler unlocks possibilities for experiments in which the wavelength of the driving laser serves as a crucial parameter. The Laboratory for Laser Energetics' petawatt-class, Multi-Terawatt optical parametric amplifier line (MTW-OPAL) has undergone several subsystem additions to rectify the idler-induced, angular dispersion, and spectral phase reversal problems. Within the scope of our knowledge, this constitutes the first achievement of simultaneous compensation for angular dispersion and phase reversal within a single system, generating a 100 GW, 120-fs pulse duration at 1170 nm.
The development of smart fabrics is significantly influenced by the performance of electrodes. Fabric-based metal electrode development faces limitations due to the preparation of common fabric flexible electrodes, which typically involves high costs, complicated procedures, and intricate patterning.