Femtosecond Laser Research Articles

Enhancement of terahertz radiation from saccharide solutions induced by femtosecond laser pulses

Enhancement of terahertz radiation from saccharide solutions induced by femtosecond laser pulses

Research advances on light-adjustable intraocular lens

Refractive error is a key determinant of visual acuity post-cataract surgery. Traditional methods for addressing refractive errors have been invasive, posing the risk of permanent surgical complications. Thus, the pursuit of non-invasive techniques for correcting refractive errors after cataract surgery is of significant clinical importance. Recently, a novel class of intraocular lenses (IOL), termed light-adjustable IOL, has emerged as a potential solution for refining refractive outcomes. These IOL possess the unique ability to alter their dioptric power in vitro through exposure to specific wavelengths of light, facilitating a non-invasive approach to refractive error correction. The landscape of light-adjustable IOL is diverse, encompassing ultraviolet light-adjustable IOL, novel nitinol-based thermomechanically adjustable IOL, IOL with refractive index changes induced by femtosecond lasers, and IOL utilizing two-photon effects for dioptric adjustment. This review article aims to summarize the advancements in light-adjustable lenses, providing insights and references for ongoing research and clinical practice in this field.

Comparison of visual outcomes between corneal topography-guided FS-LASIK and SMILE for myopia and myopic astigmatism: a network meta-analysis

Objective: To compare the postoperative visual outcomes of corneal topography-guided femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) and small incision lenticule extraction (SMILE) for myopia and myopic astigmatism. Methods: Embase and PubMed were searched for randomized controlled trials (RCTs), prospective comparative studies, observational studies and retrospective studies of patients with myopia and/or myopic astigmatism treated by corneal topography-guided FS-LASIK, the other FS-LASIKs or SMILE (inception to November 2023). The studies meeting the criteria were collected and underwent quality assessment according to the Jadad scale for RCTs and the Newcastle-Ottawa scale for non-randomized studies. RevMan4.3.0 was used for network meta-analysis. Results: A total of 17 studies were included for meta-analysis, including 7 RCT and 10 observational studies. For the percentage of surgical eyes with uncorrected distance visual acuity≥20/20 (≤3 months), there were no statistically significant differences among corneal topography-guided FS-LASIK, the other FS-LASIKs and SMILE. The surface under the cumulative ranking curve (SUCRA) ranking from best to worst was corneal topography-guided FS-LASIK (86.7%), the other FS-LASIKs (53.1%) and SMILE (10.2%). For the percentage of surgical eyes with postoperative manifest refraction spherical equivalent (MRSE) within ±0.50 D (combined follow-up measure timepoint), the main analyses showed no statistical differences among the 3 surgery groups. The sensitivity analyses disclosed the relative risk (RR) of corneal topography-guided FS-LASIK significantly increased by 14% (RR=1.14, 95%CI:0.78-1.59) as compared to that of the other FS-LASIKs, while there was no significant difference between SMILE and the other FS-LASIKs. The SUCRA ranking from best to worst was corneal topography-guided FS-LASIK (90.4%), SMILE (31.7%) and the other FS-LASIKs (27.9%). For the percentage of surgical eyes with postoperative MRSE within± 1.00 D (combined follow-up measure timepoint), the main analyses showed no statistical differences among the 3 surgery groups. The sensitivity analyses showed the RR of corneal topography-guided FS-LASIK significantly increased by 15% (RR=1.15, 95%CI:0.93-1.61) as compared to that of the other FS-LASIKs, while there was no significant difference between SMILE and the other FS-LASIKs. The SUCRA ranking from best to worst was corneal topography-guided FS-LASIK (94.5%), the other FS-LASIKs (53.9%) and SMILE (1.7%). For the percentage of surgical eyes with postoperative corrected distance visual acuity improved by 1 or more lines (combined follow-up measure timepoint), the main analyses showed no statistical difference between corneal topography-guided FS-LASIK and the other FS-LASIKs, while the RR of SMILE was slightly lower than that of the other FS-LASIKs (RR=0.86, 95%CI:0.65-1.14). The sensitivity analyses disclosed the RR of corneal topography-guided FS-LASIK significantly increased by 40% (RR=1.40, 95%CI:0.06-24.00) as compared to that of the other FS-LASIKs, while SMILE had a slightly lower RR as compared with the other FS-LASIKs (RR=0.77, 95%CI:0.17-2.74). The SUCRA ranking from best to worst was corneal topography-guided FS-LASIK (72.4%), the other FS-LASIKs (67.3%) and SMILE (10.3%). Conclusions: Compared with SMILE, FS-LASIK showed a similar postoperative visual acuity improvement. The corneal topography-guided FS-LASIK had better predictability with a higher rate of MRSE within ±0.50 D/1.00 D.

Mid‐Infrared on‐Chip Soliton Self‐frequency Shift in Chalcogenide Glass Waveguide

AbstractMid‐infrared soliton lasers leveraging the Raman self‐pumping induced soliton self‐frequency shift (SSFS) effect offer continuously tunable, highly efficient, femtosecond coherent sources that are essential for applications such as spectroscopy, metrology, and quantum optics. However, despite significant advancements in fluoride and chalcogenide fiber platforms, realizing mid‐infrared Raman soliton lasers on on‐chip platforms remains challenging. In this study, the first experimental demonstration of a mid‐infrared Raman soliton laser in an on‐chip Ge28Sb12Se60 (GeSbSe) chalcogenide glass waveguide is presented. A fully fiberized femtosecond fiber laser, centered at 1.96 µm and emitting 246 fs pulses at a 50 MHz repetition rate, is utilized as the pump source, establishing a fiber‐to‐chip configuration. The waveguides are meticulously fabricated using e‐beam lithography and plasma etching, achieving high optical quality and precision in the mid‐infrared regime. Through precise geometrical dispersion engineering, a Raman soliton laser is achieved that continuously tunes from 1960 to 2145 nm within a 32.5 mm long snakelike GeSbSe strip waveguide. The threshold for pump peak power is remarkably low, at just 14.1 W (3.47 pJ). Additionally, a more than one‐octave‐spanning near to mid‐infrared supercontinuum (1320–2760 nm at 22.9 pJ), reinforced by the combined Kerr and Raman effects, is also realized, confirming the versatile performance of the proposed GeSbSe waveguide. These findings pave the way for mid‐infrared on‐chip Raman soliton lasers, highlighting their potential for power‐efficient, low‐cost, and field‐deployable on‐chip applications in the mid‐infrared regime.

Dissociative triple ionization of argon dimers in elliptically polarized two-color laser fields.

Using ion-ion coincidence measurements, we experimentally investigate the dissociative triple ionization of argon dimers in relative phase controlled elliptically polarized two-color femtosecond laser fields. By examining the kinetic energy release-dependent momentum angular distribution of the ejected ionic fragments, two distinct pathways, each associated with different intermediates, are identified. Control over the emission directions of the ionic fragments is achieved by varying the relative phase of the elliptical two-color laser fields. Notably, the two pathways exhibit nearly opposite asymmetries in their dependence on the relative phase. Our findings demonstrate the critical role of intermediates in the dissociative triple ionization of dimers and provide a method to distinguish the intermediates involved in this process.

Tunable FSRS measurements with reduced background signals: Using an etalon filter to generate picosecond pump pulses in the 460-650nm range.

Generating wavelength-tunable picosecond laser pulses from an ultrafast laser source is essential for femtosecond stimulated Raman scattering (FSRS) measurements. Etalon filters produce narrowband (picosecond) pulses with an asymmetric temporal profile that is ideal for stimulated resonance Raman excitation. However, direct spectral filtering of femtosecond laser pulses is typically limited to the laser's fundamental and harmonic frequencies due to very low transmission of broad bandwidth pulses through an etalon. Here, we show that a single etalon filter (15cm-1 bandwidth; 172cm-1 free spectral range) provides an efficient and tunable option for generating Raman pump pulses over a wide range of wavelengths when used in combination with an optical parametric amplifier and a second harmonic generation (SHG) crystal that has an appropriate phase-matching bandwidth for partial spectral compression before the etalon. Tuning the SHG wavelength to match individual transmission lines of the etalon filter gives asymmetric picosecond pump pulses over a range of 460-650nm. Importantly, the SHG crystal length determines the temporal rise time of the filtered pulse, which is an important property for reducing background and increasing Raman signals compared with symmetric pulses having the same total energy. We examine the wavelength-dependent trade-off between spectral narrowing via SHG and the asymmetric pulse shape after transmission through the etalon. This approach provides a relatively simple and efficient method to generate tunable pump pulses with the optimum temporal profile for resonance-enhanced FSRS measurements across the visible region of the spectrum.

Improved Efficiency and Stability in Pure-Red CdSe Nanoplatelet LEDs Enabled by Gradient Alloyed CdSeS/CdZnS Crown/Shell.

Anisotropic nanoplatelets (NPLs) possess strong in-plane transition dipole moments and out-of-plane emission, which enable a maximum photon out-coupling efficiency of 40% and a high gain coefficient, making them ideal candidates for light-emitting diodes (LEDs) and lasers. However, the unbalanced surface energy between the side and top facets of NPLs results in poor thermal stability and high susceptibility to ripening at elevated temperatures, which complicates the growth of the shell. To address this issue, a gradient crown (CdSeS) around the CdSe NPLs is designed to stabilize the high energy side facets. Consequently, the gradient alloyed shell (CdZnS) is successfully grown, and the CdSe/CdSeS/CdZnS core/crown/shell NPLs exhibited near-unity photoluminescence quantum yield. The CdSeS/CdZnS crown/shell structure suppressed non-radiative Auger recombinations, achieving a record-low amplification spontaneous emission threshold of 2.11 µJcm-2 under femtosecond laser excitation. In addition, by selecting the carrier transport layers with matched energy levels, the NPL-LEDs demonstrate a record-high external quantum efficiency of 30.1% in the pure-red range, driven by the 94% in-plane transition dipole moment distribution of NPL film. The NPL-LEDs also exhibited a long operational lifetime of T95 > 600 h at a luminance of 1000 cdm-2.

Topography immune-responsive silk films for skin regeneration.

Scar formation and chronic refractory wounds pose a significant threat to public health, with abnormal immune regulation as a key characteristic. However, topography, a crucial factor influencing immune responses, has not been adequately considered in the design of wound dressings. In this study, we constructed a hierarchical structure on silk fibroin (SF) films by combining soft lithography and femtosecond laser ablation, without altering the intrinsic properties of SF. The discontinuity in the hierarchical structure induced a transformation in the morphology of macrophage RAW264.7 cells from round to spindle or pancake-like shapes, leading to phenotypic polarization toward M2 or M1. The timely transition from M1 to M2 polarization and the balance between these states promoted fibroblast L929 cells to express mRNA for FN, coll-I, TGF-β1, and α-SMA. The hierarchical structure of SF films facilitates full-thickness wound repair in vivo by regulating inflammation and promoting neovascularization and collagen deposition. Thus, hierarchical topography presents a promising strategy for the design of immunomodulatory wound dressings.

Ultrathin, Wavelength‐Multiplexed and Integrated Holograms and Optical Neural Networks Based on 2D Perovskite Nanofilms

AbstractHolography, as a technique for coherent wavefront reconstruction, is extensively used in numerous optical applications such as optical imaging, 3D display, photolithography, and optical artificial intelligence. In order to achieve highly compact and functional integration with optoelectronic devices, the hologram needs to possess ultrathin thickness as well as multicolor functionality. However, its thickness is typically limited to optical wavelength ranges due to the requirement for pronounced amplitude or phase modulation, and it generally operates at a single wavelength band without wavelength‐multiplexed channels. Here, the hologram is decreased thickness to sub‐ten nanometers by exploiting the large refractive index and strong exciton absorption of 2D perovskites. Ultrathin perovskite holograms and holographic neural networks with high stability are successfully developed by using femtosecond laser direct writing, and their operation wavelength can be rationally tuned from 400–515 nm through halide anion engineering. Consequently, the wavelength can be multiplexed with low cross‐talks by stacked perovskite nanolayers for applications of holographic display and neural networks without the usages of complex optical structures or filters. This work provides a feasible and promising technical route for integrating ultrathin, high pixel density, and multiplexed holographic structures with flat optoelectronic devices for next‐generation integrated optical systems.

Spatial analysis of femtosecond laser generated plasma using principal component analysis

The appearance of plasma generated during femtosecond laser machining depends strongly on the features present on the sample before machining occurs. However, the complexity of femtosecond light-matter interaction means that development of a theoretical understanding of plasma generation is challenging. In this work, principal component analysis is applied to experimental images of plasma generated during femtosecond laser machining of silicon to calculate the orthogonal spatial patterns of the plasma variance (plasma modes), and to identify which sample variance (sample modes) are associated with these plasma modes. The results demonstrate the potential of principal component analysis for data-driven scientific discovery in the field of femtosecond light-matter interactions.

Correlating Double‐Cone Polariton Dynamics with Local Femtosecond Laser Modifications in Ultrashort‐Pulse‐Stimulated Crystals

AbstractStrong similarities for relativistic electrons stimulated from electron beams and electron clouds are merging the boundary of wave‐particle duality of electrons, one of which being superposition is Cherenkov radiations. Recent theoretical investigations into quantum Cherenkov effects for cone‐shape particles have hypothesized electron‐spin flip transitions in bound‐ and free‐electron systems like bulk silica and graphene. However, experimental validation of these predictions remains outstanding. Here, analogous phenomena of polariton‐version quantum Cherenkov radiations observed by broadband femtosecond pump‐probe experiments is reported, and demonstrate double‐cone emission processes involving of Cherenkov‐type phonon polaritons (PhPs) and plasmon‐PhPs in ultrashort‐pulse‐stimulated ferroelectric crystals and graphene, respectively. Through component analysis of double‐cone polariton emissions using an empirical quantum dynamics model, the initial polariton dynamics are restored by time translation corrections. The resulting quantum wave packets of PhPs are found to be correlated with femtosecond‐laser‐induced modifications inside ferroelectric lithium niobates, achieving a PhP threshold criterion for ultrasmooth femtosecond laser nanofabrication.

Models optimized for real-world tasks reveal the task-dependent necessity of precise temporal coding in hearing

Neurons encode information in the timing of their spikes in addition to their firing rates. Spike timing is particularly precise in the auditory nerve, where action potentials phase lock to sound with sub-millisecond precision, but its behavioral relevance remains uncertain. We optimized machine learning models to perform real-world hearing tasks with simulated cochlear input, assessing the precision of auditory nerve spike timing needed to reproduce human behavior. Models with high-fidelity phase locking exhibited more human-like sound localization and speech perception than models without, consistent with an essential role in human hearing. However, the temporal precision needed to reproduce human-like behavior varied across tasks, as did the precision that benefited real-world task performance. These effects suggest that perceptual domains incorporate phase locking to different extents depending on the demands of real-world hearing. The results illustrate how optimizing models for realistic tasks can clarify the role of candidate neural codes in perception.

Mechanisms of Separation of the Elastic Step and the Thermal Step

AbstractThe elastic interaction causes a two‐step conversion from the low‐spin (LS) to the high‐spin state (HS) following a femtosecond laser pulse excitation. These steps occur on different timescales: a spin conversion (elastic step) in a short time due to pressure propagation and a late spin conversion (thermal step) resulting from heat diffusion. In this paper, we provide a brief review of models for spin crossover phenomena, emphasizing the role of the difference of degeneracy of the HS state and LS state and elastic interaction due to changes in local structures. We also review theoretical approaches to these effects. Additionally, to analyze the dynamical process of spin conversion after photo‐irradiation, it is necessary to consider mechanisms of heat transfer among spins. Recently, we proposed a two‐temperature model that incorporates both lattice and spin temperatures, which enables us to reproduce the two steps under an early uniformization of the lattice temperature, highlighting the importance of the timescales of these processes. Furthermore, we explore possible mechanisms to separate the two steps by examining the different timescales of processes of spin conversions by mechanical and entropic forces, and also by considering changes of local temperature due to spin conversion.

Laser interaction with undercritical foams of different spatial structures

The interaction of high-power laser pulses with undercritical foams produced by different techniques but with the same average density is studied at the PALS laser facility. The spatial–temporal evolution of X-ray emission is observed using an X-ray streak camera, electron and ion temperatures are measured by X-ray spectroscopy, and hot-electron production is characterized by monochromatic X-ray imaging. Transmission of a femtosecond laser probe pulse through foams is observed in the near and far fields. In spite of large differences in pore size and foam structure, the velocity of ionization front propagation is quite similar for all the foams studied and is slower than that in a homogeneous material of the same average density. The ion temperature in the plasma behind the ionization front is a few times higher than the electron temperature. Hot-electron production in plastic foams with small pores is strongly suppressed compared with that in solid targets, whereas in foams produced by additive manufacturing, it is significantly increased to the level observed in bare copper foil targets.

Self-assembly of MoTe2 nanostructures and nanocomposites over centimeter-large areas via femtosecond laser

The fabrication of patterned two-dimensional (2D) materials exhibits significant potential for advancing their electronic and optoelectronic applications. In this Letter, we demonstrate a rapid and scalable method for creating nanoscale periodic molybdenum ditelluride (MoTe2) nanostructures and mixed-dimensional heterostructures over a large area using direct femtosecond laser irradiation. Under intense femtosecond laser pulses, periodic energy deposition occurs in layered MoTe2 and subsequently induces the formation of MoTe2 periodic nanostructures. In addition, femtosecond laser ablation at a high repetition rate (1 MHz) results in the formation of numerous crystalline Te nanoparticles scattered on the surface of MoTe2 layers, creating mixed-dimensional Te/MoTe2 heterostructures. Notably, the fabrication of MoTe2 periodic nanostructures and mixed-dimensional heterostructures is driven by a self-assembled process. This technique enables the production of centimeter-scale MoTe2 periodic nanostructures and nanocomposites within 5 min, offering a cost-effective, lithography-free approach for fabricating periodically nanostructured 2D materials in large areas for practical applications in electronics, optoelectronics, catalysis, and sensing.

Comparison of corneal consumption in correcting high with-the-rule astigmatism between refractive lenticule extraction and laser-assisted in situ keratomileusis.

To compare corneal thickness (CT) and corneal volume (CV) consumption after the refractive lenticule extraction and the femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) in myopic eyes with high with-the-rule (WTR) astigmatism. 70 myopic eyes (50 patients) with high WTR astigmatism (-2.00 to -3.25 D) received refractive lenticule extraction (35 eyes) or FS-LASIK (35 eyes) in this retrospective study. Predicted central corneal thickness (CCT) consumption was obtained from the corresponding laser platform software. The CT in different positions (thinnest location, center, around the thinnest location at 2mm, 4mm, 6mm rings and four different directions points in every ring), and CV in different areas (around the CCT at 3mm, 5mm, 7mm, and 10mm zone) were measured via corneal tomography before surgeries and at 1, 3, and 6-month follow-up. The results of the postoperative examination indicated that refractive lenticule extraction and FS-LASIK had proximate satisfaction, safety, accuracy, and stability. In SMILE group and FS-LASIK group, the predicted CCT consumption was 111.66 ± 13.08μm and 103.26 ± 12.79μm, respectively (P = 0.010). At the 6-month follow-up, the actual changes of CCT in two groups were 96.71 ± 12.88μm and 114.74 ± 16.42μm, respectively (P < 0.001). The reduction of CCT was overestimated by 14.94 ± 8.42μm (P < 0.001) in SMILE group, while it was underestimated by 11.34 ± 7.61μm (P < 0.001) in FS-LASIK group. The ΔCT (every area and each point) was significantly lower than in FS-LASIK group at 3 postoperative time points (1, 3, 6 months) in SMILE group. The data showed that ΔCV of all areas (3, 5, 7, 10-mm diameter area) in SMILE group was significantly fewer than FS-LASIK group in each follow-up. Refractive lenticule extraction had less consumption in CT and CV compared with FS-LASIK in equivalent refractive error. In refractive lenticule extraction, the CCT consumption has been overrated, whereas underrated in FS-LASIK. Compared with refractive lenticule extraction, the actual CCT changes of FS-LASIK approached the predicted value. What is known Corneal consumption is known as the important index in the treatment of refractive lenticule extraction and the femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) for patients who suffer from myopia with astigmatism. What is new This study evaluated corneal thickness (CT) and corneal volume (CV) consumption of myopic patients with high with-the-rule (WTR) astigmatism before and after refractive lenticule extraction and FS-LASIK. There was less ΔCT and ΔCV consumption in SMILE group compared with FS-LASIK group in patients with high WTR astigmatism. The predictability of CCT consumption in FS-LASIK is better than in refractive lenticule extraction.

Li diffusion in plagioclase crystals and glasses – implications for timescales of geological processes

Abstract. The growing interest in Li diffusion as a tool to determine timescales of short-time magmatic events, such as magma ascent during eruption, increases the necessity to better understand Li diffusion in common mineral phases. In this context, well-constrained diffusion coefficients and understanding of kinetic processes specific to mineral phases are of crucial importance. To gain further insight especially into the kinetic processes in plagioclase, we investigated the diffusion of Li between natural An61 plagioclase crystals and synthetic glasses of An80 plagioclase composition. Experiments were conducted at 200 MPa in rapid-heat/rapid-quench cold-seal pressure vessels (RH/RQ CSPVs) and internally heated pressure vessels (IHPVs) at temperatures between 606 and 1114 °C. Concentration and isotope profiles of Li were measured using femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry (fs-LA-MC-ICP-MS). We adopted a multispecies diffusion model and specified boundary conditions for plagioclase of labradoritic composition. Using this model, we were able to distinguish between an interstitial (DLii) and a vacancy process (DLiA), with the interstitial process being 0.2–1 orders of magnitude faster than the vacancy process, depending on temperature. DLii=10-3.76±0.58exp⁡-180.0±12.0kJmol-1RTm2s-1DLiA=10-5.53±0.16exp⁡-151.7±3.2kJmol-1RTm2s-1 Our data indicate charge compensation of Li by Na in both the crystal and the glass. Chemical Li diffusion coefficients in An80 glass are up to 3 orders of magnitude slower compared to Li tracer diffusion in silicate and aluminosilicate glasses and melts, which is attributed to slow Na diffusion at high An content. Our results for chemical diffusion of Li in plagioclase crystals are 1.5–2 orders of magnitude slower than Li tracer diffusion in An- and Ab-rich plagioclase determined in previous studies. This indicates that earlier studies on natural intermediate plagioclase compositions have underestimated timescales by up to 2 orders of magnitude. For accurate determination of timescales from Li diffusion in plagioclase we suggest further exploring the role of Na and a possible dependence on An content.

Strong-Field Theory of Attosecond Tunneling Microscopy

Attosecond observations of coherent electron dynamics in molecules and nanostructures can be achieved by combining conventional scanning tunneling microscopy (STM) with ultrashort femtosecond laser pulses. While experimental studies in the subcycle regime are under way, a robust strong-field theory description has remained elusive. Here we devise a model based on the strong-field approximation. Valid in all regimes, it provides a surprising analogy to the standard model of STM. We show that the intuitive three-step model of attosecond science directly emerges from our model and we also describe the optimal conditions for attosecond STM experiments. Published by the American Physical Society 2024

Arnold tongues, shrimp structures, multistability, and ecological paradoxes in a discrete-time predator–prey system

This paper explores a discrete-time system derived from the well-known continuous-time Rosenzweig–MacArthur model using the piecewise constant argument. Examining the impact of increasing carrying capacity and harvesting efforts, we uncover intricate phenomena, such as periodicity, quasiperiodicity, period-doubling, period-bubbling, and chaos. Our analysis reveals that increasing the carrying capacity of prey species can lead to both system stabilization and destabilization. We delve into normal forms associated with different bifurcation types, accompanied by numerical examples, observing multistabilities with intricate basin structures. Bistable, tristable, and quadruple attractors characterize the model’s multistable states. Additionally, we find that enriching prey species negatively affects predator abundance, and increasing carrying capacity can lead to a sudden jump in predator population to the brink of extinction. Examining the two-parameter space of predator and prey harvesting efforts, we identify organized periodic structures: Arnold tongues and shrimp-like structures within quasiperiodic and chaotic regions. Arnold tongues exhibit a sequence of periodic adding. The shrimp structures indicate the existence of period-doubling and period-bubbling phenomena. Discussions on ecological interpretations of predator harvesting, including the paradoxical hydra effect, are provided.

Dispersal induced catastrophic bifurcations, Arnold tongues, shrimp structures, and stock patterns in an ecological system.

This paper presents a comprehensive analysis of a discrete-time predator-prey model within a homogeneous two-patch environment, incorporating both prey and predator dispersal. We consider a logistic growth for both prey and predator species, and the predation process is based on the Holling type-II functional response in the isolated patches. We explore the existence of multiple coexisting equilibria and establish their stability conditions. By independently varying the prey and predator dispersal rates, we discover a sequence of phenomena including bifurcations, quasiperiodicity, and chaos. In addition, we observe a 10-period orbit, each point of the periodic orbit gives birth to a closed invariant curve. Such large number of closed invariant curves are generally not reported in spatially coupled population models. The system exhibits both catastrophic (non-smooth) jumps and smooth transitions in the dynamics whenever a bifurcation occurs. Commonly, dispersal can only destabilize the coexisting equilibrium. However, we found the stabilization of the coexisting equilibrium, which is a rare occurrence. Furthermore, a two-parameter space analysis reveals intricate dynamics when both dispersal rates are varied simultaneously, showcasing complex phenomena and the emergence of organized periodic regimes such as Arnold tongues and shrimp structures. We also investigate the stock pattern of both species with respect to the dispersal. This study enhances the understanding of predator-prey interactions in spatially homogeneous environments, illuminating their intricate and dynamic nature.