Journal of Russian Laser Research最新文献

{"title":"Anatomical mapping of transdermal laser irradiation over the carotid and radial arteries: a cadaveric study on light penetration and dosimetry","authors":"Juliano Abreu Pacheco,&nbsp;Kelly Fernanda Molena,&nbsp;Renato Bittencourt Pacheco,&nbsp;Angelita Maria Stabile","doi":"10.1007/s10946-026-10307-3","DOIUrl":"10.1007/s10946-026-10307-3","url":null,"abstract":"<div><h3>Objective</h3><p>This study aimed to map the dispersion of transdermal red-light laser irradiation in anatomical structures adjacent to the common carotid artery (CCA) and radial artery (RA). Using a cadaveric model, the investigation quantifies light attenuation and estimates the effective dosage reaching these clinically relevant vascular targets and surrounding neurovascular tissues.</p><h3>Methods</h3><p>A detailed dissection was performed on a male cadaveric specimen at the University of São Paulo, Brazil. A 660 nm continuous-wave laser with an output power of 100 mW was used, resulting in a surface irradiance of 200 mW/cm² over a 0.5 cm² area. The active laser tip was positioned perpendicularly over the CCA and RA regions for a 60-second exposure to visualize and document light dispersion. The Beer-Lambert law was applied to calculate the percentage of initial light intensity reaching each artery, using an effective tissue attenuation coefficient (μ_eff) of 0.5 mm⁻¹.</p><h3>Results</h3><p>Visual analysis confirmed that laser irradiation extended beyond the target arteries, illuminating significant adjacent structures. At the neck, the vagus nerve, internal jugular vein, and sternocleidomastoid muscle were irradiated. At the wrist, the median nerve and pronator quadratus muscle were affected. Dosimetric calculations revealed a substantial difference in light penetration: approximately 28.65% of the surface light intensity reached the RA (at a depth of 2.5 mm), while only 0.0045% reached the CCA (at a depth of 20 mm). The estimated irradiance at the RA was 57.30 mW/cm², a therapeutically relevant dose, whereas the irradiance at the CCA was negligible (0.0091 mW/cm²).</p><h3>Conclusion</h3><p>This anatomical and dosimetric analysis demonstrates that the RA is a far more efficient and predictable site for transdermal laser therapy aiming for systemic vascular effects compared to the CCA, due to its superficial location. The study highlights that transdermal laser application is not target-specific, resulting in the concomitant irradiation of multiple neurovascular and muscular structures. This expanded regional photobiomodulation should be considered when interpreting clinical outcomes and designing therapeutic protocols. These findings provide a critical anatomical and physical basis for future research in systemic photobiomodulation.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"357 - 365"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10946-026-10307-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution behavior of a partially coherent vector beam carrying the elliptical vortex phase propagating in non-uniform turbulent atmosphere","authors":"Yonggen Xu,&nbsp;Bocheng Li,&nbsp;Fenghe Tian,&nbsp;Kai Huang,&nbsp;Yuqiang Li","doi":"10.1007/s10946-026-10304-6","DOIUrl":"10.1007/s10946-026-10304-6","url":null,"abstract":"<div><p>Analytical expressions for cross-spectral density matrix of a partially coherent vector beam carrying the elliptical vortex phase (i.e., partially coherent elliptical vortex vector beam, PCEVV beam) propagating through a turbulent atmosphere along an uplink path are obtained with the help of extended Huygens-Fresnel principle. Effects of beam parameters and turbulence parameters on evolution behaviors of PCEVV beam are studied in detail by numerical simulations. Our findings indicate that the PCEVV beam will self-rotate and self-split in turbulence, and atmospheric turbulence will induce the generation and annihilation of coherent vortices. Studies for degree of polarization (DOP) and polarization power imply that the beam depolarization can be dropped by increasing topological charge and initial correlation length as well as reducing zenith angle. It also can be found that evolution of state of polarization (SOP) mainly depends on ellipticities of beam. Our results hold great significance for atmospheric polarization imaging and measurement, free-space optical communications.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"317 - 333"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458717","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":"Bipartite entangled states in inverse fourth-Harmonic generation","authors":"Sourish Sarkar,&nbsp;Dilip Kumar Giri","doi":"10.1007/s10946-026-10309-1","DOIUrl":"10.1007/s10946-026-10309-1","url":null,"abstract":"<div><p>A theoretical model is developed for the generation of nonclassical light in the process of Inverse Fourth-Harmonic Generation (IFHG) using a first-order interaction Hamiltonian under the short-time approximation framework. The analysis reveals the emergence of two-mode quadrature squeezing and bipartite entanglement as primary signatures of quantum correlations in this process. A larger coherent input amplitude and stronger nonlinear coupling significantly enhance the depth of quadrature squeezing. At the same time, the relative phase plays a decisive role in controlling interference and suppressing quantum noise. The criteria for bipartite entanglement, as outlined by Duan et al., are derived and satisfied. Quantitative verification of entanglement is further carried out using the Hillery-Zubairy (HZ) criteria HZ‑1 and HZ‑2, with HZ‑1 demonstrating greater sensitivity under conditions of strong coherence. The explicit dependence of these criteria on amplitude and phase highlights the tunability of entanglement through experimentally controllable parameters. In essence, IFHG emerges as a viable mechanism for achieving robust two-mode squeezing and bipartite entanglement, offering valuable prospects for quantum communication, continuous-variable quantum information technologies, and integrated quantum photonic systems.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"366 - 398"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458719","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":"Terahertz emission from plasma induced by an extraordinary femtosecond laser pulse","authors":"Konstantin N. Ovchinnikov","doi":"10.1007/s10946-026-10310-8","DOIUrl":"10.1007/s10946-026-10310-8","url":null,"abstract":"<div><p>The generation of terahertz (THz) radiation from a magnetized plasma under the normal incidence of a linearly polarized femtosecond laser pulse, whose electric field is perpendicular to the static magnetic field in the plasma, is investigated. The case where the carrier frequency of the laser pulse is close to the plasma frequency is considered. In this case, the static magnetic field varies from a value at which the carrier frequency coincides with the upper cutoff frequency to values at which the carrier frequency approaches the upper hybrid frequency. The possibility of a significant enhancement of the THz radiation is demonstrated upon increasing the static magnetic field when the pulse carrier frequency approaches the upper hybrid frequency.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"399 - 407"},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148459054","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":"Gaze-Aware inverse light field mapping for autostereoscopic displays","authors":"Hang Su,&nbsp;Yingchao Xu,&nbsp;Subin Wang,&nbsp;Bo Liu,&nbsp;Ronghui Hong","doi":"10.1007/s10946-026-10297-2","DOIUrl":"10.1007/s10946-026-10297-2","url":null,"abstract":"<div><p>To overcome the limitations of traditional light field mapping algorithms, including pixel holes in depth discontinuities and computational complexity that grows polynomially as scene resolution increases, we propose a gaze-aware inverse light field mapping algorithm. A corresponding autostereoscopic display system is also developed. In this method, we decouple real-time gaze tracking and inverse light field mapping, executing them as parallel processing threads. The gaze-tracking thread processes video streams from the depth camera. A deep neural network is used to achieve real-time localization of the human eye’s 3D coordinates. Based on the real-time 3D eye coordinates, the inverse mapping thread establishes an inverse mapping model from the elemental image to the scene. Experimental results demonstrate that the proposed algorithm effectively eliminates the pixel holes in depth discontinuities common in traditional algorithms, thereby improving light field reproduction quality. As the scene resolution doubles, the speedup factor of the proposed method over the traditional one reaches 1.15–1.20, confirming the method’s efficiency and practicality in high-resolution scenarios.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 3","pages":"250 - 263"},"PeriodicalIF":1.0,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380632","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":"Investigation of fractional quantum information measures in an SU(1,1) quantum system coupled to two atoms","authors":"S. Sanad,&nbsp;S. Al-Awfi,&nbsp;E. M. Khalil,&nbsp;H. F. Habeba","doi":"10.1007/s10946-026-10302-8","DOIUrl":"10.1007/s10946-026-10302-8","url":null,"abstract":"<div><p>In this work, we investigate the effects of fractional-order dynamics on SU(1,1) quantum system interacting with two two-level atoms. Using a fractional Hamiltonian framework, we analyze the time evolution of key quantum information measures, including the quantum Fisher information, the I₁-norm of coherence, and quantum steering. The atomic subsystem is initially prepared in the superposition state, while the SU(1,1) quantum system is assumed to be in the Perelomov coherent state. The obtained results show that the fractional parameters play a crucial role in controlling and enhancing the non classical properties of the system. This study provides a deeper understanding of how fractional dynamics can be used to control and optimize quantum correlations in SU(1,1)-atom interaction systems and suggest potential applications in quantum metrology, quantum sensing, and quantum communication.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"297 - 307"},"PeriodicalIF":1.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458732","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":"Manipulating THz signal with optical waveguide for identification of breast tumour cells","authors":"Gopinath Palai,&nbsp;Rasmita Kumari Mohanty,&nbsp;Abinash Panda,&nbsp;Archana Rath,&nbsp;Milan Kumar Sahoo","doi":"10.1007/s10946-026-10306-4","DOIUrl":"10.1007/s10946-026-10306-4","url":null,"abstract":"<div><p>In this study, a two-dimensional triangular photonic crystal waveguide structure (TPCS) is proposed for the rapid identification of breast tumour cells using terahertz (THz) frequency. The structure is proposed with a 2 D photonic crystal on a glass substrate, on which cylindrical air holes are etched, each having a diameter of 860 nm and a lattice spacing of 1 µm, was analyzed using the Plane Wave Expansion (PWE) method to evaluate the field distribution and sensing parameters. From the literature survey, four input frequencies—0.5 THz, 1.0 THz, 1.5 THz, and 2.0 THz—were taken and examined to distinguish between normal and tumour tissues based on field intensity distribution, refractive index variation, and spectral response. The refractive index difference (∆n) reached a maximum of 0.70 at 1.0 THz, indicating the strongest dielectric contrast. Electric Field Enhancement (EFE) was found to peak at 1.0 THz, corresponding to enhanced optical confinement and localized energy interaction within tumour samples. Sensitivity and Figure of Merit (FOM) analysis confirmed optimal performance at 1.0 THz, with the highest detection accuracy and contrast ratio of CR ≈ 5. Conversely, at 2.0 THz, the refractive index difference dropped to 0.11, and the contrast ratio decreased drastically, signifying poor differentiation capability. The proposed sensor achieved a detection time of 40 µs, demonstrating a fast and non-invasive approach for tissue discrimination. These results confirm that the 0.5–1.5 THz range provides effective operational frequencies for biomedical sensing, offering a compact and efficient platform for tumour detection.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"344 - 356"},"PeriodicalIF":1.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458733","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":"Passively Q-switched mode-locked Nd:YAG laser with Cr:YAG saturable absorber and double-corner-cube-retroreflector cavity","authors":"Haitao Jiang,&nbsp;Xianwei Meng,&nbsp;Guanqu Hu","doi":"10.1007/s10946-026-10300-w","DOIUrl":"10.1007/s10946-026-10300-w","url":null,"abstract":"<div><p>A stable unidirectional operated passively Q‑switched mode-locked Nd:YAG laser based on the double corner-cube-retroreflectors (CCRs) ring cavity with Cr:YAG saturable absorber is demonstrated. The performance was characterized using Cr:YAG saturable absorbers with different initial transmissions (38% and 59%), where a lower transmission was found to promote deeper modulation and more stable temporal profiles for the mode-locked pulses. At a pump repetition rate of 100 Hz, the laser achieved a single-envelope energy of 0.434 mJ and a maximum output energy of 5.86 mJ (pump peak power: 320.4 W). With the variation of the initial transmission of the Cr:YAG, the temporal measurements showed envelope durations of 46 ns and 64 ns, with an intra-envelope pulse spacing of 2.6 ns and 2.9 ns. The system exhibited rapid start-up and maintained stable operation for over 30 min, benefiting from the strong inherent anti-misalignment of the double-CCR design. Experimental results verify that this cavity structure significantly enhances tolerance to both angular and translational alignment errors, while the initial transmission of the saturable absorber provides a direct means to tailor the output pulse characteristics.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 3","pages":"280 - 286"},"PeriodicalIF":1.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380450","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":"Adjustable anomalous hollow Hermite elliptical vortex beam and its properties","authors":"Siqi Wang,&nbsp;Dajun Liu,&nbsp;Yaochuan Wang,&nbsp;Haiyang Zhong","doi":"10.1007/s10946-026-10303-7","DOIUrl":"10.1007/s10946-026-10303-7","url":null,"abstract":"<div><p>In this paper, we have introduced a new beam with elliptical vortex named adjustable anomalous hollow Hermite elliptical vortex beam (AAHHVEB), and the expression of such AAHHVEB consists of adjustable anomalous part, elliptical Gaussian part and elliptical vortex part. Under the paraxial propagation, the intensity of such AAHHVEB can show the different profiles, such as multi-spots pattern, or the elliptical ring shape. The propagation equation of such AAHHVEB in (gradient-index) GRIN medium is derived, and the evolution of such AAHHVEB in GRIN medium is analyzed. It is shown that the intensity pattern of such AAHHVEB in GRIN will show the periodic focusing and defocusing phenomenon during propagation, and the intensity profiles of such AAHHVEB in GRIN medium are modulated by parameters of beam and GRIN medium.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 4","pages":"308 - 316"},"PeriodicalIF":1.0,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148459088","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":"Numerical analysis of femtosecond second-harmonic generation in periodically poled GaN crystals","authors":"O. I. Sabirov,&nbsp;A. S. Ashirov,&nbsp;U. K. Sapaev","doi":"10.1007/s10946-026-10296-3","DOIUrl":"10.1007/s10946-026-10296-3","url":null,"abstract":"<div><p>This work presents a numerical investigation of second-harmonic generation (SHG) from ultrashort femtosecond laser pulses in gallium nitride (GaN) nonlinear photonic crystals with a periodically modulated second-order nonlinear susceptibility. A coupled-wave model is employed to simulate the spatiotemporal evolution of the fundamental and second-harmonic pulses, taking into account linear absorption, group-velocity mismatch, dispersive effects, and quasi-phase matching. The influence of these factors on the conversion efficiency and temporal pulse profiles is systematically analyzed.</p><p>The results demonstrate that linear absorption in GaN significantly limits the effective interaction length and reduces the achievable conversion efficiency in the femtosecond regime. Dispersive effects lead to a pronounced degradation of the conversion efficiency for shorter pulses and cause substantial temporal pulse distortion, including pulse splitting. In addition, the SHG process is shown to be highly sensitive to deviations of the domain length from the value required for quasi-phase matching, with even moderate fabrication errors resulting in a noticeable efficiency reduction. These findings highlight the critical role of dispersion management, absorption minimization, and precise domain engineering for the realization of efficient GaN-based femtosecond frequency converters.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 3","pages":"240 - 249"},"PeriodicalIF":1.0,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380322","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}