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. To achieve a range of sampling points, the stretch factors are adaptable by altering the dispersion of CFBG. In light of this, the system's complete sampling rate can be amplified. Only one channel is necessary to both increase the sampling rate and generate the multi-channel sampling effect. In conclusion, seven categories of stretch factors, varying from 1882 to 2206, are generated, mirroring seven unique clusters of sampling points. Input radio frequency (RF) signals, possessing frequencies ranging from 2 GHz to 10 GHz, were successfully recovered by us. In conjunction with the increase in the equivalent sampling rate to 288 GSa/s, the sampling points are multiplied by 144. Microwave radar systems, commercial in nature, that can provide a far greater sampling rate at a reduced cost, are compatible with the proposed scheme.

Ultrafast, large-modulation photonic materials have enabled the exploration of numerous previously inaccessible research areas. T-cell mediated immunity A notable example includes the promising outlook of photonic time crystals. This analysis emphasizes the most recent, promising material breakthroughs, potentially applicable to photonic time crystals. We scrutinize the worth of their modulation in relation to its speed and depth of adjustment. Our investigation also encompasses the impediments that still need addressing, coupled with our projection of prospective routes to success.

Quantum networks rely on multipartite Einstein-Podolsky-Rosen (EPR) steering as a fundamental resource. While observations of EPR steering in spatially separated ultracold atomic systems have been made, a secure quantum communication network necessitates deterministic manipulation of steering between far-apart quantum network nodes. A feasible approach for the deterministic generation, storage, and control of one-way EPR steering between distant atomic cells is presented, leveraging a cavity-enhanced quantum memory scheme. The unavoidable noise in electromagnetically induced transparency is effectively suppressed by optical cavities, enabling three atomic cells to hold a strong Greenberger-Horne-Zeilinger state due to their faithful storage of three spatially separated entangled optical modes. By leveraging the substantial quantum correlation within atomic cells, one-to-two node EPR steering is realized, and this stored EPR steering can be preserved in the quantum nodes. Furthermore, the temperature of the atomic cell actively shapes and manipulates the steerability. By providing a direct reference, this scheme allows the experimental construction of one-way multipartite steerable states, thereby enabling an asymmetric quantum network protocol.

Our research focused on the optomechanical interactions and quantum phases of Bose-Einstein condensates in ring cavities. The cavity field's running wave mode interaction with atoms leads to a semi-quantized spin-orbit coupling (SOC) for the atoms. We observed a striking resemblance between the evolution of matter field magnetic excitations and an optomechanical oscillator navigating a viscous optical medium, showcasing excellent integrability and traceability independent of atomic interactions. Consequently, the link between light atoms produces a sign-alternating long-range atomic interaction, substantially transforming the system's conventional energy pattern. A quantum phase displaying a high degree of quantum degeneracy was found in the transitional region of the system exhibiting SOC. Our immediately realizable scheme yields measurable experimental results.

To our knowledge, a novel interferometric fiber optic parametric amplifier (FOPA) is introduced, specifically designed to reduce the generation of unwanted four-wave mixing artifacts. Simulations encompass two configurations. One setup removes idlers, the other, unwanted nonlinear crosstalk from the signal output. This numerical analysis demonstrates the practical feasibility of suppressing idlers by greater than 28 decibels across at least ten terahertz. This enables the reuse of idler frequencies for signal amplification and correspondingly doubles the usable FOPA gain bandwidth. We showcase that this can be accomplished even when the interferometer is equipped with practical couplers; this is accomplished by introducing a slight attenuation into one of the interferometer's arms.

The coherent combining of 61 tiled channels within a femtosecond digital laser enables the control of far-field energy distribution. For each channel, amplitude and phase are regulated independently, treating it as an individual pixel. Implementing a phase variation between neighboring fibers or fiber-bundles results in enhanced agility of far-field energy distribution, and promotes further exploration of phase patterns as a method to boost the efficiency of tiled-aperture CBC lasers, and tailor the far field in real-time.

The optical parametric chirped-pulse amplification process yields two broadband pulses, a signal pulse and an idler pulse, each attaining peak powers exceeding 100 gigawatts. 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. Improvements to the petawatt-class, Multi-Terawatt optical parametric amplifier line (MTW-OPAL) at the Laboratory for Laser Energetics, implemented via additional subsystems, are detailed in this paper, focusing on the issues related to idler, angular dispersion, and spectral phase reversal. According to our current understanding, this marks the first successful integration of angular dispersion and phase reversal compensation within a single system, producing a 100 GW, 120-fs duration pulse at 1170 nm.

In the design and development of smart fabrics, electrode performance stands out as a primary consideration. The process of preparing common fabric flexible electrodes is hampered by its high cost, sophisticated preparation techniques, and complex patterning, which restricts the progress of fabric-based metal electrode technology. Consequently, this paper detailed a straightforward method of fabricating Cu electrodes through the selective laser reduction of CuO nanoparticles. Through the optimization of laser processing power, scanning speed, and focusing precision, a Cu circuit exhibiting an electrical resistivity of 553 μΩ⋅cm was fabricated. Leveraging the photothermoelectric properties of the copper electrodes, a white light photodetector was subsequently developed. Under a power density of 1001 milliwatts per square centimeter, the photodetector achieves a detectivity of 214 milliamperes per watt. Fabric surface metal electrode or conductive line preparation is facilitated by this method, enabling the creation of wearable photodetectors with specific manufacturing techniques.

A program for monitoring group delay dispersion (GDD) is presented within the context of computational manufacturing. Broadband and time-monitoring simulator dispersive mirrors, both computationally manufactured by GDD, are examined comparatively. Dispersive mirror deposition simulations, utilizing GDD monitoring, yielded results indicative of particular advantages, as observed. GDD monitoring's capacity for self-compensation is explored. GDD monitoring's role in enhancing the precision of layer termination techniques could make it a viable approach to manufacturing other optical coatings.

We illustrate a method to gauge average temperature changes in operating optical fiber networks via Optical Time Domain Reflectometry (OTDR), at the resolution of a single photon. We formulate a model in this paper that links temperature changes in an optical fiber to corresponding shifts in the time of flight of reflected photons, spanning from -50°C to 400°C. Our configuration enables the precise measurement of temperature fluctuations, with a 0.008°C resolution, across kilometer-long distances, and we demonstrate this capability within a dark optical fiber network spanning the Stockholm metropolitan area. By employing this approach, in-situ characterization becomes possible for both quantum and classical optical fiber networks.

The mid-term stability evolution of a table-top coherent population trapping (CPT) microcell atomic clock, previously challenged by light-shift effects and alterations in the cell's internal atmosphere, is documented here. Through the implementation of a pulsed, symmetric, auto-balanced Ramsey (SABR) interrogation technique, combined with the stabilization of setup temperature, laser power, and microwave power, the light-shift contribution is now effectively managed. BGB 15025 The micro-fabrication of the cell, using low-permeability aluminosilicate glass (ASG) windows, has effectively reduced the pressure variations of the buffer gas inside the cell. lung biopsy Employing both methods, the Allan deviation of the clock is ascertained to be 14 parts per 10^12 at 105 seconds. At the one-day mark, this system's stability level demonstrates a competitive edge against the best current microwave microcell-based atomic clocks.

A shorter probe pulse duration in a photon-counting fiber Bragg grating (FBG) sensing system yields higher spatial resolution, yet this improvement, as dictated by Fourier transforms, causes spectral widening, thus diminishing the sensing system's sensitivity. Using a dual-wavelength differential detection methodology, we examine, in this study, the influence of spectrum broadening on a photon-counting fiber Bragg grating sensing system. Having developed a theoretical model, a proof-of-principle experimental demonstration was successfully realized. Different spectral widths of FBG correlate numerically with the sensitivity and spatial resolution, as shown in our results. Our results from the experiment with a commercial FBG, featuring a spectral width of 0.6 nanometers, demonstrated a 3-millimeter optimal spatial resolution and a 203 nanometers per meter sensitivity.