Journal of Russian Laser Research最新文献

{"title":"Design and performance analysis of an end-Pumped solar nd:YAG laser system using four-Rod configuration and off-Axis parabolic mirrors","authors":"Imene Kouicem,&nbsp;Belkhir Tioua","doi":"10.1007/s10946-026-10315-3","DOIUrl":"10.1007/s10946-026-10315-3","url":null,"abstract":"<div><p>This investigation evaluates a multi-rod end-pumped solar laser architecture. The system utilizes four Nd:YAG rods with individual dimensions of 5.2 mm in diameter and 34 mm in length. ZEMAX® and LASCAD™ platforms provided the simulation framework. The multi-stage concentration strategy integrates four large primary Off-Axis Parabolic Mirrors, four smaller redirection off axis parabolic mirrors, and two fused silica aspheric lenses. While the collection efficiency measured 24.13 W/m² in this specific configuration, the multimode laser output power reached 96.51 W. The multi-rod arrangement optimizes absorption efficiency and beam brightness. Furthermore, strategic distribution of solar flux across the four gain media effectively minimizes thermal loading within the resonator. These refinements maximize laser output stability.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 5","pages":"459 - 472"},"PeriodicalIF":1.0,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903584","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":"Thermal management of a CW dual-slab side-pumped high-power laser based on the optical path difference","authors":"Mohsen Ghaedrahmati,&nbsp;Masoud Kavosh Tehrani,&nbsp;Abbas Maleki,&nbsp;Seyed Ayoob Moosavi","doi":"10.1007/s10946-026-10311-7","DOIUrl":"10.1007/s10946-026-10311-7","url":null,"abstract":"<div><p>This study investigated the thermal management of a continuous-wave (CW) dual-slab side-pumped high-power Nd:YAG laser, optimizing the cooling channel design to enhance performance. We highlight the critical roles of the cooling channel thickness, coolant flow velocity, and coolant medium type in minimizing the temperature gradient, optical path difference (OPD), and thermal stress within the active medium. We derived an equation to calculate the OPD caused by thermal stress in a side-pumped laser. Our findings indicate that an optimal cooling channel thickness of 0.5 mm effectively balances heat dissipation with mechanical integrity. Furthermore, increasing the coolant flow velocity markedly reduces the OPD and thermal gradient. We established that the relationship between the fluid inlet velocity and OPD is nonlinear, with a reduction in OPD from 13.1 to 6.71 μm as the fluid velocity increases from 0.2 m/s to 0.6 m/s. Comparative analysis revealed that the use of heavy water instead of pure water reduced the thermal gradient, enhanced the beam quality, and reduced the thermal stress. The transition from pure water to heavy water at optimal conditions reduced OPD from 10.2 to 9.47 μm, underscoring the potential of advanced cooling solutions in laser applications.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 5","pages":"429 - 445"},"PeriodicalIF":1.0,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903301","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":"Extracavity third-harmonic generation at 213 nm of a passively Q-switched Pr:YLF laser","authors":"Yi Yao,&nbsp;Yue Zhao,&nbsp;Jidong Li,&nbsp;Chuanbo Wang,&nbsp;Fang Ma,&nbsp;Wei Dou,&nbsp;Quan Zheng","doi":"10.1007/s10946-026-10295-4","DOIUrl":"10.1007/s10946-026-10295-4","url":null,"abstract":"<div><p>We report on short pulse deep ultraviolet (DUV) laser operating at 213 nm from an extracavity third harmonic generation (THG) of a passively Q‑switched (PQS) Pr:YLF laser. By compensating the thermal lens effect of the laser crystal and utilizing Co:MgAl₂O₄ (MALO) as the saturable absorber (SA), we obtain the highest pulse output power at 213 nm generated from a PQS Pr:YLF laser by the method of THG. Under pumping with a fiber coupled blue laser diode, we realized 11.87 ns pulse width at a repetition rate of 11.95 kHz, with an average output power of 152.8 mW at 213 nm. This is the highest PQS pulse deep UV at 213 nm generated by extracavity third harmonic generation of a passively Q‑switched Pr:YLF laser.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 5","pages":"423 - 428"},"PeriodicalIF":1.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903500","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":"Thermal effects on the emission characteristics of colloidal quantum dots for laser-driven color conversion applications","authors":"Kaliprasanna Swain,&nbsp;Rasmita Kumari Mohanty,&nbsp;Gopinath Palai,&nbsp;Sudipta Dash,&nbsp;Bibhu Kalyan Mishra","doi":"10.1007/s10946-026-10308-2","DOIUrl":"10.1007/s10946-026-10308-2","url":null,"abstract":"<div><p>This work evaluates the temperature stability and photonics application performance of elastomeric colloidal quantum dot (CQD) color converters by analyzing their spectral irradiance characteristics under different thermal settings. We present an extensive assessment of the effects of high temperatures on the optical characteristics of CQDs by examining shifts in peak wavelength, intensity fluctuations, as well as modifications in the full-width at half-maximum (FWHM) at various temperature settings. Our results show considerable variations in emission intensities and peak wavelengths, together with a notable broadening and narrowing of the spectral lines, indicating temperature impacts on the quantum dot size distribution and energy band gap. These observations are critical to the optimization of CQD applications in high-temperature devices, like modern display technologies and Aser-based lighting and projection systems. These findings are particularly relevant for laser-driven color conversion systems, where high optical flux and localized thermal loading significantly influence emission stability and spectral purity.</p></div>","PeriodicalId":663,"journal":{"name":"Journal of Russian Laser Research","volume":"47 5","pages":"446 - 458"},"PeriodicalIF":1.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148903502","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":"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":"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}