Laser Physics Letters最新文献

{"title":"Coherent control of parametric generation of laser beams via intersubband transitions in quantum wells","authors":"Astro Ltd, K. M. Batoo, M. H. Kamona, Sh H Zaki, H. A. Lafta, S. Hussain, M. Khazaal, H. M. Hamoody, A. H. Abdulkadhim, M. L. Shaghnab, F. A. Rasen, A. Alawadi, A. Alsalamy","doi":"10.1088/1612-202X/ad1096","DOIUrl":"https://doi.org/10.1088/1612-202X/ad1096","url":null,"abstract":"This paper investigates the propagation dynamics of laser beams within a semiconductor quantum well (QW) system. The study explores various scenarios involving different detuning values and spatially varying incident beams. The light–matter interaction within the QW system shows a complex interplay between detuning, spatial characteristics, and beam properties. In the resonant case, where the detuning values for probe and signal beams are zero, we observe exponential relaxation of both beams reaching a common value. Introducing detuning leads to oscillatory behaviors, with larger detuning values promoting more pronounced oscillations and an enhanced signal beam. The investigation takes an intriguing turn when we consider position-dependent incident beams. In these cases, the spatial patterns of the initial beam are transferred to the generated beam, leading to soliton-like propagation and the creation of beams with specific spatial dependencies. Remarkably, under substantial detuning, both incident and generated beams adopt periodic patterns in two dimensions, forming lattice structures with spot-like peak intensities. These findings underscore the versatility and controllability of the QW system, offering opportunities for engineered spatial and spectral properties in laser beams.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"28 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Third harmonic generation microscopy of magnetic domains in garnet films","authors":"A. Maydykovskiy, Nikita S Popov, Tatiana Murzina","doi":"10.1088/1612-202X/ad12af","DOIUrl":"https://doi.org/10.1088/1612-202X/ad12af","url":null,"abstract":"Nonlinear optical microscopy is a powerful non-destructive technique that allows to study a wide range of phenomena. Optical third harmonic generation (THG) is mostly known by its applications in investigation of biological structures, while magneto-optical effects in THG are not well recognized. Here we demonstrate high efficiency of the THG probe in studies of magnetic domain structure of epitaxial garnet films. We show that in spite of relatively small values of the magneto-optical effect at the THG wavelength, the THG microscopy may be efficient for the characterization of magnetic surface domains if the THG wavelength falls in the absorption band of a medium. Moreover, the in-depth sensitivity of this probe may be higher as compared to the case of the second harmonic generation microscopy.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"38 17","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139446222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bimetallic solid solution MAX phase Ti2NbAlC2 as saturable absorber for passively Q-switched Er3+-doped fiber laser","authors":"Bin Zhao, Hong-Ping Zhang, Rong-Ze Ma, Gerald Farrell, Zhen-Rui Li, Peng-Fei Wang","doi":"10.1088/1612-202x/ad174c","DOIUrl":"https://doi.org/10.1088/1612-202x/ad174c","url":null,"abstract":"In this paper, we demonstrated a stable Q-switched fiber laser operation with a central wavelength of 1531.43 nm using a bimetallic solid solution MAX phase Ti₂NbAlC₂ saturable absorber. The minimum pulse duration of 3.67 <italic toggle=\"yes\">μ</italic>s and the maximum repetition rate of 32.56 kHz were acquired at the pump power of 300 mW. Furthermore, the Q-switched pulse has a maximum output power of 1.08 mW and a maximum pulse energy of 33.14 nJ. Our results indicate that the Ti₂NbAlC₂ is a promising saturable absorber material. The bimetallic solid solution MAX phase materials may be developed as novel nonlinear photonic devices with outstanding performance.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"32 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139092416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Propagation of electromagnetic pulses with nonzero area in dissipative media","authors":"A V Bogatskaya, E A Volkova, A M Popov","doi":"10.1088/1612-202x/ad174d","DOIUrl":"https://doi.org/10.1088/1612-202x/ad174d","url":null,"abstract":"The propagation of ultrashort electromagnetic pulses with a nonzero electric area in dielectric and conducting media is studied in the frame of a unidirectional propagation model. General solutions for the electric pulse area are obtained for different types of media with a linear response to the external field. It is shown that the evolution of the electric area of the pulse is dramatically different for conducting and non-conducting media. In the case of dielectrics, where the current induced by an external field arises from the polarization of bound electrons, the electric pulse area is an invariant of pulse propagation in spite of the dissipation process. For media with free charge carriers (plasma or semiconductors), the electric pulse area decreases with time due to Joule heating of the media by the static component of the field.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"23 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139096703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of quantum steering for the generalized Werner states via artificial neural networks","authors":"Guo-Zhu Pan, Shu-Ting Zou, Ming Yang, Jian Zhou, Gang Zhang","doi":"10.1088/1612-202x/ad174e","DOIUrl":"https://doi.org/10.1088/1612-202x/ad174e","url":null,"abstract":"Quantum steering is an important nonlocal resource and has a wide range of applications in quantum information processing. Although a lot of steering criteria have been proposed, it is still very difficult to efficiently detect quantum steering in experiment. Here we employ machine learning techniques to tackle the problem of quantum steering detection in two-qubit system. The quantum steering and un-steering inequalities are combined together, so as to construct quantum steering classifiers for the generalized Werner states via artificial neural networks. More steerable and unsteerable quantum states can be identified by the classifiers proposed here than by the quantum steering inequality or un-steering inequality, which provides a new way to detect steering with only partial information of the given quantum states. We consider two types of artificial neural networks, one is the single-layer perceptron and the other is the multi-layer perceptron. The result shows that the multi-layer perceptron outperforms the single-layer perceptron in terms of accuracy. Compared with the existing quantum steering criteria, our methods do not require the whole information of the quantum state, and the steering of it is detected by using state-independent measurements, so it is easy to realize in experiment.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"26 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An optical encryption method based on double-threshold correspondence imaging","authors":"Mingze Sun, Xingdu Bai, Zhan Yu, Xinjia Li, Yang Liu, Yue Li, Jialin Zhang, Dan Zhao, Xin Zhou","doi":"10.1088/1612-202X/ad12b1","DOIUrl":"https://doi.org/10.1088/1612-202X/ad12b1","url":null,"abstract":"An optical cryptosystem called double-threshold correspondence imaging (DTCI) encryption method is proposed. In DTCI encryption, two thresholds are used to select the larger and smaller bucket detector values, and the object image can be recovered only by averaging the speckle patterns corresponding to these selected bucket detector values. Compared with the traditional computational ghost imaging encryption, the ciphertext of DTCI encryption is a group of serial numbers rather than all bucket detector values, which not only reduces the volume of ciphertext but also enhances the security. Furthermore, the average operation replaces the second-order correlation operation in the decryption process, simplifying the decryption process and reducing the time cost. And the feasibility and high security of this method are verified by computer simulations.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"63 39","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of photodynamic action on pure and mixed cultures of gram-negative bacteria: related to growth mechanisms","authors":"Rebeca V de Lima, Jennifer M Soares, Kate C Blanco, Vanderlei S Bagnato","doi":"10.1088/1612-202x/ad12b0","DOIUrl":"https://doi.org/10.1088/1612-202x/ad12b0","url":null,"abstract":"Gram-negative bacteria present a significant challenge to conventional treatments due to their structurally complex cell walls, setting them apart from their gram-positive counterparts. These structural distinctions, coupled with various antimicrobial resistance mechanisms, make them highly resilient. Photodynamic inactivation (PDI) has emerged as a promising technique to address this challenge, capitalizing on oxidative stress induced by the synergy of light and a photosensitizer (PS). In this study, we delved into the application of PDI and its repercussions on both <italic toggle=\"yes\">Klebsiella pneumoniae</italic> and <italic toggle=\"yes\">Escherichia coli</italic> bacteria, in both pure cultures and mixed populations. Our investigation encompassed an analysis of changes in growth curves when influenced by photodynamic and the response to the susceptibility to gentamicin. Methods: Various concentrations (50 <italic toggle=\"yes\">μ</italic>M, 100 <italic toggle=\"yes\">μ</italic>M, and 150 <italic toggle=\"yes\">μ</italic>M) of synthetic curcumin solutions served as PS in treatment groups. Additionally, solvents such as dimethyl sulfoxide and 0.1% sodium dodecyl sulfate (SDS) were evaluated to enhance PS mobility and absorption. Growth curves for pure and mixed cultures were established, both pre- and post-PDI, and in the presence of 0.1% SDS. Blue light irradiation at 30 J cm⁻² and 450 nm was employed. The minimum inhibitory concentration (MIC) of the antibiotic was determined with and without PDI + SDS. Results: While PDI did not achieve optimal bacterial reduction for these strains, it did introduce oxidative damage that has the potential to affect other critical aspects of the temporal progression of cultures and their responses to antibiotics. Conclusion: This study shows that even with the minimal impact of PDI in the presence of 0.1% SDS, observable alterations in bacterial growth profiles and MIC values occur and can be used in favor of treatment involving such infections.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"171 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Entropic property of randomized QAOA circuits","authors":"A Yu Chernyavskiy, B I Bantysh, Yu I Bogdanov","doi":"10.1088/1612-202x/ad12ad","DOIUrl":"https://doi.org/10.1088/1612-202x/ad12ad","url":null,"abstract":"Quantum approximate optimization algorithm (QAOA) aims to solve discrete optimization problems by sampling bitstrings using a parameterized quantum circuit. The circuit parameters (angles) are optimized in the way that minimizes the cost Hamiltonian expectation value. Recently, general statistical properties of QAOA output probability distributions have begun to be studied. In contrast to the conventional approach, we analyse QAOA circuits with random angles. We provide analytical equations for probabilities and the numerical evidence that for unweighted Max-Cut problems on connected graphs such sampling always gives higher entropy of energy distribution than uniform random sampling of bitstrings. We also analyse the probability to obtain the global optima, which appears to be higher on average than for random sampling.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"6 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-wavelength Nd:CALGO laser based on differential loss of birefringent filter","authors":"Reza Akbari, Pavel Loiko, Jun Xu, Xiaodong Xu, Arkady Major","doi":"10.1088/1612-202x/ad1099","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1099","url":null,"abstract":"Continuous-wave dual-wavelength (DW) operation of an a-cut Nd:CALGO (Nd:CaGdAlO₄) laser around ∼1.08 <italic toggle=\"yes\">μ</italic>m was demonstrated using a single plate quartz birefringent filter (BRF) with an on-surface optical axis. A wide range of wavelength separations between the two laser lines ranging from sub-nm up to 10 nm was observed with controllable intensity ratios. A new regime of operation of DW laser was also identified where one of the oscillating spectral lines was in the rejection band of the filter. This is in sharp contrast with typical operation of DW lasers with BRF where wavelength separation was limited either to the free spectral range or to the linewidth of a single transmission peak of the used filter. This was enabled by differential loss introduced by a single transmission peak of the BRF. Using this mechanism, generation of a large number of laser wavelength pairs became possible.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"26 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fast reconstruction of programmable interferometers with intensity-only measurements","authors":"B I Bantysh, A Yu Chernyavskiy, S A Fldzhyan, Yu I Bogdanov","doi":"10.1088/1612-202x/ad0caf","DOIUrl":"https://doi.org/10.1088/1612-202x/ad0caf","url":null,"abstract":"Programmable linear optical interferometers are promising for classical and quantum applications. Their integrated design makes it possible to create more scalable and stable devices. To use them in practice, one has to reconstruct the whole device model taking the manufacturing errors into account. The inability to address individual interferometer elements complicates the reconstruction problem. A naive approach is to train the model via some complex optimization procedure. A faster optimization-free algorithm has been recently proposed (Bantysh <italic toggle=\"yes\">et al</italic> 2023 <italic toggle=\"yes\">Opt. Express</italic>\u0000<bold>31</bold> 16729–42). However, it requires the full transfer matrix tomography while a more practical setup measures only the fields intensities at the interferometer output. In this paper, we propose the modification of the fast algorithm, which uses additional set of interferometer configurations in order to reconstruct the model in the case of intensity-only measurements. We show that it performs slightly worse than the original fast algorithm but it is more practical and still does not require intensive numerical optimization.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"171 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}