Results in OpticsPub Date : 2025-05-02DOI: 10.1016/j.rio.2025.100831
Abebe Yeshaw, Misrak Getahun
{"title":"Effects of atom and nonlinear crystal on quantum properties of cavity light","authors":"Abebe Yeshaw, Misrak Getahun","doi":"10.1016/j.rio.2025.100831","DOIUrl":"10.1016/j.rio.2025.100831","url":null,"abstract":"<div><div>We examine the cavity modes with a nonlinear crystal and a lambda-type three-level atom coupled to the squeezed vacuum reservoir. The expectation values of the cavity and atomic variables at steady state have been used to determine quadrature variances and logarithmic negativity. The cavity modes exhibit quadrature squeezing and entanglement according to the criteria. The existence of a nonlinear crystal in the cavity and squeezed vacuum reservoir coupling the cavity modes increases the degree of squeezing and entanglement. The coupling constant for atom and cavity modes reduces both the degree of squeezing and entanglement. Furthermore, Duan et al. and logarithmic negativity criteria for entanglement are directly proportional to the variance of the minus quadrature.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100831"},"PeriodicalIF":0.0,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-28DOI: 10.1016/j.rio.2025.100835
Mohammed S. Al-Ghamdi , Norah A. Al-anazi , Ivan B. Karomi
{"title":"Investigation of the optical modal gain in an InAsP/AlGaInP quantum dot laser diode structure","authors":"Mohammed S. Al-Ghamdi , Norah A. Al-anazi , Ivan B. Karomi","doi":"10.1016/j.rio.2025.100835","DOIUrl":"10.1016/j.rio.2025.100835","url":null,"abstract":"<div><div>The light–current (L–I) and current–voltage (I–V) characteristics of self-assembled InAsP/AlGaInP quantum dots grown by organometallic vapor-phase epitaxy were measured over a temperature range of 160–400 K. The investigated samples had different cavity lengths (1, 2, 3, and 4 mm). Our results show that the threshold current decreases with increasing cavity length. The lower threshold current density was 212 A/cm<sup>2</sup>, which corresponds to a cavity length of 4 mm. Moreover, the threshold modal gains for various stripe cavity lengths were investigated at room temperature. The longest cavity (4 mm) consisted of many dots; therefore, it easily reached the threshold modal gain of 6.5 cm<sup>−1</sup>. The temperature dependence of the threshold current density (<em>J<sub>th</sub></em>) was investigated. It was found that <em>J<sub>th</sub></em> increased with increasing temperature and it increases faster at high operating temperatures. A 4 mm device is less temperature dependent with <em>T<sub>0</sub></em> ≈ 83 K when operated between 320 and 360 K. The emission spectra exhibited a redshift of approximately 14 nm when the cavity length increased from 1 to 4 mm. The ideality factor and series resistance of the diode laser structures decrease with increasing temperature.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100835"},"PeriodicalIF":0.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-28DOI: 10.1016/j.rio.2025.100837
Monika Kosowska , Valery V. Tuchin , Małgorzata Szczerska
{"title":"Concept study on using fiber-optic sensors with nanocrystalline diamond sheet for tissue monitoring in radiotherapy","authors":"Monika Kosowska , Valery V. Tuchin , Małgorzata Szczerska","doi":"10.1016/j.rio.2025.100837","DOIUrl":"10.1016/j.rio.2025.100837","url":null,"abstract":"<div><div>Ionizing radiation plays a crucial role in medical diagnostics and therapy, particularly in cancer treatment. This paper presents a novel concept for real-time tissue monitoring during radiotherapy using fiber-optic sensors integrated with a diamond nanosheet protection. The system could monitor tissue refractive index changes, enabling differentiation between healthy and cancerous tissues. Optical phantoms are used to simulate biological tissues, facilitating controlled experiments. The diamond coating ensures sensor biocompatibility, stability, and durability in medical environments. This technology promises enhanced treatment accuracy by providing real-time feedback on tissue changes during radiotherapy.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100837"},"PeriodicalIF":0.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-27DOI: 10.1016/j.rio.2025.100834
Arun Kumar , Nishant Gaur , Aziz Nanthaamornphong
{"title":"A mathematical PAPR estimation of OTFS network using a machine learning SVM algorithm","authors":"Arun Kumar , Nishant Gaur , Aziz Nanthaamornphong","doi":"10.1016/j.rio.2025.100834","DOIUrl":"10.1016/j.rio.2025.100834","url":null,"abstract":"<div><div>The article presents a Support Vector Machine (SVM) algorithm to lower the peak-to-average power ratio (PAPR) in networks that work in orthogonal time frequency space (OTFS). High PAPR makes power amplifiers less efficient and lowers signal quality. This makes OTFS modulation challenging, even though it is known for being strong in situations with a lot of movement. We present a mathematical framework that uses SVM, selective mapping (SLM), partial transmission sequence (PTS), and clipping and filtering (C&F) to estimate PAPR correctly, effectively lowering the PAPR while maintaining bit error rate (BER) performance. The proposed SVM method reduces the PAPR associated with conventional PAPR estimation techniques. The numerical results reveal that the proposed SVM obtained a signal-to-noise ratio (SNR) gain in the range of 1 dB–3 dB and retained the BER performance of the framework. This leads to better power control and overall better network performance. This paper demonstrates the potential of machine learning in optimizing OTFS networks, paving the way for more reliable and efficient radio systems.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100834"},"PeriodicalIF":0.0,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-25DOI: 10.1016/j.rio.2025.100833
G. Martinot-Lagarde, H. Mariey, N. Maurice, J. Scariot, H. Viot
{"title":"The optical challenge of two-colour lunar laser ranging at MéO station","authors":"G. Martinot-Lagarde, H. Mariey, N. Maurice, J. Scariot, H. Viot","doi":"10.1016/j.rio.2025.100833","DOIUrl":"10.1016/j.rio.2025.100833","url":null,"abstract":"<div><div>This article describes recent optical developments for the Nd:YAG laser at the MéO station, which regularly carries out <strong>L</strong>unar/<strong>S</strong>atellite Laser Ranging (<strong>L</strong>LR/<strong>S</strong>LR) observations for fundamental physics and space geodesy. MéO (registred as GRSM 7845 in the International Laser Ranging Service network) ranges to the Moon since 1981 with lasers undergoing continuous development for improved reliability. Since 2012, a 150 ps pulsed laser version has provided reliable green LLR. Infrared LLR followed from 2015 and two-colour ranging started recently. This work focuses on the recent optical improvements to this laser to achieve this two-colour capability. There, the Paraxial Gaussian Beam tool of the <em>Zemax OpticStudio</em> software models the evolution of the beam shape throughout its propagation inside the station. This enhanced optical set-up drastically improved the lifetime of the biggest rod of the amplification chain, cancelled an annoying thermal pointing drift and supressed infrared vignetting. In 2023, these developments provided 91 two-colour LLR observations for lunar heights greater than 32°. Finally, the text suggests two perspectives for achieving two-colour LLR for Moon heights below 32°.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100833"},"PeriodicalIF":0.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-24DOI: 10.1016/j.rio.2025.100832
Zheyuan Li, Shiyu Wang, Lequn Li, Bing Bin Li, Defang Cai, Qian Guo, Taibo Wang, Fuqiang Ma
{"title":"Transient temperature field analysis of periodic side-pumped solid-state lasers","authors":"Zheyuan Li, Shiyu Wang, Lequn Li, Bing Bin Li, Defang Cai, Qian Guo, Taibo Wang, Fuqiang Ma","doi":"10.1016/j.rio.2025.100832","DOIUrl":"10.1016/j.rio.2025.100832","url":null,"abstract":"<div><div>For the effective thermal management of a diode-pumped solid-state laser (DPSSL) with periodic pulsing and side-pumping, the transient temperature field of a side-pumped diode-pumped solid-state laser is calculated. The transient temperature field of the DPSSL under periodic pumping is analyzed, and the time-varying characteristics of the transient temperature field of the DPSSL under multidirection pumping are revealed. The results show that the transient temperature of the laser crystal increases rapidly and then decreases slowly in a single pumping period. Upon extending the pumping period, the peak value of the crystal transient temperature increases gradually and eventually becomes constant. After leveling off, the temperature field presents an axisymmetrical distribution that is high in the middle and low in the periphery, which is more uniform than that in the initial pumping stage. This study provides a theoretical basis for modeling and simulating the DPSSL side pump temperature field and provides theoretical support for further research into the transient thermal effects of the DPSSL system.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100832"},"PeriodicalIF":0.0,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-17DOI: 10.1016/j.rio.2025.100830
A.M. Beigzadeh , M.R. Rashidian Vaziri , B. Shakeri Jooybari
{"title":"Evaluation of nonlinear optical properties of neutron irradiated polymethyl methacrylate and their recovery over time","authors":"A.M. Beigzadeh , M.R. Rashidian Vaziri , B. Shakeri Jooybari","doi":"10.1016/j.rio.2025.100830","DOIUrl":"10.1016/j.rio.2025.100830","url":null,"abstract":"<div><div>Poly(methyl methacrylate) (PMMA) is a synthetic polymer that is widely used in the world due to its transparency, toughness, ease of shaping, low cost, and high resistance to UV light and weathering. It has many applications in various industries such as nuclear and space industries in the form of optical PMMA fibers and may be subjected to high energy neutrons. The structural and optical properties of PMMA change due to neutron irradiation, which may have adverse effects on its functionality in these applications. In this study, the effect of reactor neutron irradiation on structural and nonlinear optical properties of PMMA has been experimentally investigated. It is shown that neutron irradiation results in inducing a negative nonlinear refractive index in PMMA that gradually decreases over time. It is further shown that the induced nonlinear refractive index decreases to 0.4 of its initial value after 80 days. It is proposed that this negative nonlinear refractive index can be an additional source of radiation induced attenuation (RIA) in PMMA optical fibers. To the best of our knowledge, this is the first indication that negative nonlinearity can be a source of RIA in PMMA fibers. Aside from its adverse effects on signal propagation in PMMA fibers, the induced negative nonlinearity by neutrons can be beneficially used to design new photonic components such as all-optical switches, modulators, and more with bulk PMMA pieces.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100830"},"PeriodicalIF":0.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-16DOI: 10.1016/j.rio.2025.100819
Mukesh Kumar , Arpit Khandelwal , Azeemuddin syed
{"title":"Effect of steady-state thermal blooming on atmospheric propagation of Laguerre Gaussian beam","authors":"Mukesh Kumar , Arpit Khandelwal , Azeemuddin syed","doi":"10.1016/j.rio.2025.100819","DOIUrl":"10.1016/j.rio.2025.100819","url":null,"abstract":"<div><div>In this article, the effect of steady-state thermal blooming on various modes of Laguerre Gaussian (LG) beams propagating through the atmosphere is studied analytically. The intensity and distortion parameter expressions for different modes of LG beams are derived and analyzed under the influence of thermal blooming. The outcomes demonstrate that augmenting the propagation distance, input power, and atmospheric absorption coefficient while keeping other parameters constant intensifies the thermal blooming impact on the LG beam. Conversely, a rise in the initial radius and transverse wind speed decreases the impact of thermal blooming. The results indicate that as the mode order of Laguerre Gaussian beams increases, they experience a reduced thermal blooming effect. Higher LG modes exhibit less intensity distortion than lower LG modes. The shift in centroid position due to thermal blooming is minimal in the higher mode of the LG beam, in contrast to the lower mode. These findings provide valuable insights into determining the beam quality and intensity variation of different modes of LG beams in thermal blooming.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100819"},"PeriodicalIF":0.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-10DOI: 10.1016/j.rio.2025.100817
Hamed Saghaei , Mohammad Soroosh , Mohammad Javad Maleki , Haraprasad Mondal , Tofiq Nurmohammadi , Behnam Jafari , Mohsen Shahi , Vahid Sepahvandi , Ehsan Adibnia
{"title":"High-performance and compact photonic crystal channel drop filter using P-shaped ring resonator","authors":"Hamed Saghaei , Mohammad Soroosh , Mohammad Javad Maleki , Haraprasad Mondal , Tofiq Nurmohammadi , Behnam Jafari , Mohsen Shahi , Vahid Sepahvandi , Ehsan Adibnia","doi":"10.1016/j.rio.2025.100817","DOIUrl":"10.1016/j.rio.2025.100817","url":null,"abstract":"<div><div>We propose and demonstrate a novel high-performance optical channel drop filter based on two-dimensional photonic crystal ring resonators with a P-shaped configuration. This innovative structure represents a significant advancement over existing designs by achieving a near-unity dropping efficiency of 99.9 % and a quality factor of 876 at a resonant wavelength of 1533.8 nm within a compact footprint of 12.75 μm × 12.75 μm. The optimized configuration introduces a CMOS-compatible fabrication process, facilitating seamless integration into next-generation photonic integrated circuits. Our design not only achieves superior performance metrics compared to previously reported structures but also addresses the critical challenges of miniaturization and fabrication simplicity. These advancements make the proposed filter particularly suited for advanced optical communication systems, including 5G/6G networks, and contribute to the ongoing development of high-efficiency, scalable photonic devices.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100817"},"PeriodicalIF":0.0,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in OpticsPub Date : 2025-04-10DOI: 10.1016/j.rio.2025.100826
Muhammad Salman Mohsin , Mariana Lanzarini-Lopes , Katrina Fitzpatrick
{"title":"Mathematical modeling and experimental validation of optical coupling efficiency in Ultraviolet-C light emitting diode systems","authors":"Muhammad Salman Mohsin , Mariana Lanzarini-Lopes , Katrina Fitzpatrick","doi":"10.1016/j.rio.2025.100826","DOIUrl":"10.1016/j.rio.2025.100826","url":null,"abstract":"<div><div>This study provides a novel mathematical model for predicting the coupling efficiency (C.E) between multimode optical fibers (MMF) and ultraviolet light-emitting diodes (UV-C LEDs) with a high degree of accuracy. Unlike previous models, which rely on simplified assumptions (ideal conditions), this approach incorporates real-world variations in LED emission profiles, optical misalignments, and Fresnel losses. The model was validated using four distinct optical system configurations, demonstrating strong agreement (R<sup>2</sup> = 0.94) with experimental data. The results from this study provide a robust framework for designing efficient UV delivery systems, particularly for disinfection and sensing applications and will serve as a practical guideline that may be useful for both the scientific and industrial community.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100826"},"PeriodicalIF":0.0,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}