Optics Communications最新文献

{"title":"Phase control of transmission and reflection in a sample of duplicated two-level systems driven by a stationary control field","authors":"F.A. Hashmi ,&nbsp;E. Brion ,&nbsp;M.A. Bouchene","doi":"10.1016/j.optcom.2025.131874","DOIUrl":"10.1016/j.optcom.2025.131874","url":null,"abstract":"<div><div>In this article, we study the optical response of a duplicated two-level atomic medium subjected to a stationary control field and a weak co-propagating probe field, orthogonally polarized to each other. We show that both the reflected and transmitted components of the probe can be absorbed or amplified. Furthermore, for moderate optical depths, the reflection and transmission factors are controlled by the relative phase between the control and probe fields, making the configuration we present here promising for the development of optical devices. We also determine the exact conditions under which reflection and transmission factors can be controlled by the relative phase between the control and probe fields.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"587 ","pages":"Article 131874"},"PeriodicalIF":2.2,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Dynamics of light localization via coherent control: The interplay of transmission, absorption and disorder in photonic crystals","authors":"Nancy Ghangas ,&nbsp;Shubhrangshu Dasgupta ,&nbsp;Ghanasyam Remesh ,&nbsp;Venu Gopal Achanta","doi":"10.1016/j.optcom.2025.131876","DOIUrl":"10.1016/j.optcom.2025.131876","url":null,"abstract":"<div><div>This study investigates the interplay between structural disorder, absorption, and Lyapunov exponent dynamics to exploit localization phenomena in photonic crystals with engineered defect layers. We generate disorder by introducing random refractive index variations in one of the bilayers, while the application of a control field to <span><math><mi>Λ</mi></math></span>-type atoms within a central defect layer enables dynamic tuning of the crystal’s effective refractive index. We have employed traditional transfer matrix method to demonstrate transmission, Lyapunov exponents and absorption in the crystal. Through coherent control, we dynamically tune absorption, revealing sharp contrasts in band gap and band edge regions. while Lyapunov exponents, quantifying localization lengths, exhibit a consistent scaling across both band gap and band edge frequencies, and this behavior remains robust even in the presence of disorder. Hence, distinct localization mechanisms emerge at bandgap and band-edge frequencies. Bandgap localization arises from optical mode confinement and resonant alignment of atomic transitions with the probe field while band edge localization stems from a synergy of loss-difference-induced trapping and Anderson-like disorder effects. Notably, while disorder weakens confinement localization in the band gap, it actually strengthens localization at the band edges. These results deepen the understanding of light-matter coupling in disordered photonic systems and provide a framework for designing reconfigurable optical devices with tailored localization properties.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"587 ","pages":"Article 131876"},"PeriodicalIF":2.2,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Optimization of photon counting algorithm based on ICMOS detectors","authors":"Hongli Tuo ,&nbsp;Bingli Zhu ,&nbsp;Yonghong Li ,&nbsp;Weiwei Cao ,&nbsp;Ziyuan Ma ,&nbsp;Shuai Long ,&nbsp;Yonglin Bai","doi":"10.1016/j.optcom.2025.131941","DOIUrl":"10.1016/j.optcom.2025.131941","url":null,"abstract":"<div><div>ICMOS detectors usually use analog integration method to process signals in the low-light field, but when the light intensity is reduced to the single-photon level for very-low-light detection, the detection sensitivity and Signal-to-Noise Ratio (SNR) are significantly degraded due to the limitations of low photoelectric conversion efficiency and system noise. To enhance the performance of ICMOS detectors in very-low-light detection, this study introduces photon-counting imaging through algorithmic optimization and improves the single-photon event resolution accuracy through noise suppression to optimize the quality of photon-counting imaging. In this paper, a three-step photon counting algorithm optimization scheme is proposed: firstly, the background noise level under different light intensity conditions is optimized by combining the system characteristics with Gaussian fitting and dynamic threshold adjustment of adjustment factor <span><math><mrow><mi>k</mi></mrow></math></span>; secondly, the signal cluster response are extracted by combining the connected component analysis and the 8-connected seed-filling algorithm, and the residual background noise, which is manifested as the point response, is removed; and lastly, the single-photon event resolution is performed by the centroid method. In addition, in order to verify the effectiveness of the optimization scheme, this paper compares the optimized photon counting algorithm with the traditional analog integration method, and verifies the improvement of the SNR by photon counting statistics and contrast calculation. The results show that the optimized photon counting algorithm not only significantly improves the detection sensitivity and SNR of the ICMOS detector, but also effectively improves the spatial resolution.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"586 ","pages":"Article 131941"},"PeriodicalIF":2.2,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Two-step hybrid retrieval algorithm for characterizing ultrashort optical pulse from its SHG-FROG trace","authors":"Xiaowei Dong,&nbsp;Xingmi Wei","doi":"10.1016/j.optcom.2025.131940","DOIUrl":"10.1016/j.optcom.2025.131940","url":null,"abstract":"<div><div>In this paper, we propose a two-step hybrid retrieval algorithm for characterizing ultrashort optical pulse from its measured SHG-FROG trace. In the first step, we use a modified ResNet50 deep neural network and a very small training datasets containing only 4000 FROG-trace samples to quickly obtain the rough characteristics of the pulse to be retrieved. Then, we use the results obtained in the first step as the initial values of the iterative optimization in the second step, which can further obtain more accurate characteristics of ultrashort optical pulse. Results demonstrate that the two-step hybrid retrieval algorithm can achieve very high accuracy in characterizing ultrashort optical pulses. And the correlation coefficient between the reconstructed FROG trace based on the retrieved ultrashort optical pulse and the original measured FROG trace can approximately reach 1.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"587 ","pages":"Article 131940"},"PeriodicalIF":2.2,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Fabrication of single-mode photonic molecular microcavity laser using femtosecond laser direct writing","authors":"Mutian Li ,&nbsp;Chao Zhang ,&nbsp;Jin Ding ,&nbsp;Licheng Wang ,&nbsp;Shulin Han ,&nbsp;Liang Chen ,&nbsp;Yan Wang","doi":"10.1016/j.optcom.2025.131854","DOIUrl":"10.1016/j.optcom.2025.131854","url":null,"abstract":"<div><div>Currently, optical microcavities are widely applied to serve various purposes such as high-precision sensing and detection, which is due to their sensitivity to the surrounding environment. Herein, SU 8 photoresist is applied through femtosecond laser direct writing (FsLDW) to produce high-precision single-mode whispering gallery mode (WGM) microcavity resonators. During the experimental process, three microcavities with different radii (R₁ = 10 μm, R₂ = 12 μm, R₃ = 15 μm) are obtained by superimposing single-mode selective microcavities. Despite multiple laser modes of three microcavities with different radii, only the coexisting modes are subject to multiple internal total reflections after dissipation field coupling, which results in a single-mode laser spectrum. The research results obtained through this study are expected to contribute novel ideas to the production of single-mode photonic molecular microcavities.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"587 ","pages":"Article 131854"},"PeriodicalIF":2.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Non-degenerate signal pulse compression and amplification using DFG-based nonlinear interaction via controlling pump pulse power and shape","authors":"Hamid Nadgaran ,&nbsp;Mohammad Amin Izadi ,&nbsp;Rahman Nouroozi","doi":"10.1016/j.optcom.2025.131894","DOIUrl":"10.1016/j.optcom.2025.131894","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This study investigates the simultaneous amplification and compression of signal and idler pulses through the nonlinear difference-frequency generation (DFG) process in quasi-phase-matched Ti in-diffused LiNbO&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; (LNB) nonlinear optical waveguides. Using the split-step Fourier transform numerical method, we demonstrate that pulsed pump sources can achieve simultaneous amplification and compression of signal and idler pulses, provided the slope of the idler pulse peak growth (&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;) relative to the idler energy conversion efficiency (&lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;) remains positive. Under optimized conditions, signal energy conversion efficiency (&lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;) reaches up to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;22&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;7&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, with the full width at half maximum (FWHM) of the resultant signal pulses reduced from &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;9&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; ps at a propagation length of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;20&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Furthermore, employing pump pulses with shorter FWHM (FWHM = &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) than the initial signal pulses, enhances compression and amplification, achieving an FWHM of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;32&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; for the signal pulses with initial FWHM of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Also, &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; reaches to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;12&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;8&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. In a realistic scenario involving a 50 km conventional single-mode fiber (CSF), severely distorted pulses with an FWHM of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;300&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;&gt;&lt;/mo&gt;&lt;mn&gt;90&lt;/mn&gt;&lt;mstyle&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; energy loss are successfully amplified to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;9&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mstyle&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;/mstyle&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and ","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"587 ","pages":"Article 131894"},"PeriodicalIF":2.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Analytical model of supercontinuum coherence degradation induced by pump intensity noise","authors":"Zhao Zhang ,&nbsp;Haihao Cheng ,&nbsp;Ting Zhang ,&nbsp;Jing Jia ,&nbsp;Ran Pan ,&nbsp;Xiaohong Hu ,&nbsp;Yishan Wang","doi":"10.1016/j.optcom.2025.131939","DOIUrl":"10.1016/j.optcom.2025.131939","url":null,"abstract":"<div><div>The coherence of supercontinuum (SC), which presents the pulse-to-pulse stability, is important for optical frequency combs because it determines the phase noise performance of the detected carrier-envelope offset frequency. However, researches on coherence degradation of an octave SC induced by the inherent intensity noise of pump pulses injected into highly-nonlinear photonic crystal fiber (HN-PCF) are incomplete. In this study, we propose a novel characterization method for SC coherence under pump intensity noise, which uses the coherence of soliton with the maximum red-shifted rate to represent the overall SC coherence. This method is verified by numerically solving the nonlinear Schrödinger equation. An analytical model which converts the soliton coherence into phase stability of the optical field is further present to prove the simulation results. Our investigations show that, when the pump pulse is injected into anomalous-dispersion region of the HN-PCF, for a fixed SC spectral range and root-mean-square relative intensity noise value of pump light, coherence degradation across an octave SC band is more intense with a decline of the injected pulse peak power, the adoption of HN-PCF with a smaller nonlinear parameter and when the pump wavelength lies further away from the zero dispersion point of HN-PCF. Moreover, it is found that, for a fixed pulse peak power and HN-PCF parameters, the impacts of injected pulse duration are negligible. Our research provides effective avenues to improve the octave SC coherence under pump intensity noise.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"586 ","pages":"Article 131939"},"PeriodicalIF":2.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Aligning spectral emissivity profiles to the atmospheric transmission window for radiative cooling using layered dielectrics augmented with metamaterial interfaces","authors":"Niloufar Pirouzfam,&nbsp;Muhammed Ali Kecebas,&nbsp;Kursat Sendur","doi":"10.1016/j.optcom.2025.131935","DOIUrl":"10.1016/j.optcom.2025.131935","url":null,"abstract":"<div><div>Passive radiative cooling, an innovative approach for cooling buildings and devices, has attracted considerable attention in recent years. One significant challenge in radiative cooling is the need for surfaces with selective spectral emissivity that aligns with the atmospheric transmission of earth. The spectral emissivity of the surface in the 8–13 μm serves as a crucial factor in enhancing the net cooling capacity of the surface. In this study, we achieved a spectral surface emissivity that is aligned with the atmospheric transmission window using layered dielectrics augmented with a metamaterial interface. By harnessing the strong coupling within the gap of a bowtie antenna resulting from the interaction of light with metallic surfaces, we achieve a broadband absorption around a resonance frequency within the atmospheric window spectrum. Additionally, we successfully attained broadband reflection in the visible region with a reflectivity of more than approximately 97 % and in the near-infrared spectra through the design and optimization of alternating layers with high and low refractive indices (SiO₂–TiO₂) deposited on a thin silver layer. Our results indicate that merging the metamaterial surface with dielectric layers eliminates the need for thick layers in conventional radiative cooling structures. This configuration significantly improves cooling performance, and it results in a more compact and thinner stack.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"587 ","pages":"Article 131935"},"PeriodicalIF":2.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Excited-state-induced decoherence in long-lived Bloch oscillation","authors":"Haodan Yang,&nbsp;Fusheng Liu,&nbsp;Guangjiong Dong","doi":"10.1016/j.optcom.2025.131898","DOIUrl":"10.1016/j.optcom.2025.131898","url":null,"abstract":"<div><div>Long-lived Bloch oscillation (BO) of the macroscopic wavefunction for a Bose–Einstein condensate in a tilted far-off resonant optical lattice has been exploited for precision measurement. The self-interaction between the ground state atoms is one main dephasing factor. When the self-interaction is effectively reduced to nearly zero by Feshbach resonance, experiments show that the long-lived BO can be achieved; however, after several seconds, the decoherence, not expected by conventional theory, can be induced. In this paper, we show that in this situation, the cross-interaction between atoms in the excited state and ground state becomes an important decoherence factor. Our numerical results show that for a short interrogation time, the cross-interaction has little influence on the BO, whereas, after a few seconds, the cross-interaction plays an important role of deteriorating BO. The Gross–Pitaevskii equation including the influence of excited atoms has been developed, giving much improved description of the long-lived BO dynamics.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"586 ","pages":"Article 131898"},"PeriodicalIF":2.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Low-cost 3D-printed laser beam quality meter","authors":"Riccardo Brameri ,&nbsp;Riccardo Gotti ,&nbsp;Sara Pizzurro ,&nbsp;Antonio Agnesi","doi":"10.1016/j.optcom.2025.131936","DOIUrl":"10.1016/j.optcom.2025.131936","url":null,"abstract":"<div><div>A low-cost laser beam profiler and beam quality meter has been developed, based on inexpensive off-the-shelf components assembled with 3D-printing technology. The device requires manual operation and an external PC, which is readily available in most practical cases. The alignment and measurement procedures are straightforward and highly useful for quick yet reliable operations.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"586 ","pages":"Article 131936"},"PeriodicalIF":2.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}