{"title":"Direct optimal calculation method for obtaining the thickness and complex refractive index of chalcogenide glass films","authors":"Yue Zhang, Yao Zhou, Yinghao Cao, Jianxing Zhao, Rui Hong, Jiaxuan Ren, Gong Zhang, Shigeng Song, Chonge Wang, Yinglin Song, Jianhong Zhou","doi":"10.1007/s00340-025-08526-8","DOIUrl":"10.1007/s00340-025-08526-8","url":null,"abstract":"<div><p>A direct optimal calculation method was proposed to determine the thickness, refractive index, and extinction coefficient of thin films solely from experimental transmittance data. Unlike conventional approaches, this method does not rely on any dispersion model. Numerical and experimental analyses confirm its accuracy. The variations in refractive index and extinction coefficient curves demonstrate the chemical bond properties of chalcogenide films. This work provides a useful method for analyzing the optical parameters of the optical films.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167554","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":"A novel geometrical approach to quantum teleportation and remote estimation","authors":"Seyed Mohammad Hosseiny, Jamileh Seyed-Yazdi, Milad Norouzi, Somayyeh Ghorbani, Pouyan Ghiasi","doi":"10.1007/s00340-025-08519-7","DOIUrl":"10.1007/s00340-025-08519-7","url":null,"abstract":"<div><p>The process of transmitting an arbitrary unknown quantum state through quantum and classical channels between distant sender and receiver locations is commonly referred to as quantum teleportation. When physical presence at the quantum teleportation destination is impossible, we utilize quantum remote estimation to analyze the received information. This study introduces a novel geometrical approach to quantum teleportation based on a dipolar interacting magnetic system. Furthermore, we examine quantum remote estimation of the initial phase at the output of the geometric quantum teleportation via the current model. The research explores the impact of quantum-level crossings resulting from the magnetic anisotropies of dipolar interacting systems on the processes of quantum teleportation and quantum remote estimation. The results indicate that quantum teleportation and quantum remote estimation encounter challenges at the boundary of quantum level crossings but can be optimized in other states, such as the ground states. Our finding highlights the need for further investigations into geometric quantum teleportation and its implications.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167654","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}
Applied Physics BPub Date : 2025-07-21DOI: 10.1007/s00340-025-08521-z
Daisy R. H. Smith, Silpa Muralidharan, Roland Hablützel, Georgina Croft, Klara Theophilo, Alexander Owens, Yashna N. D. Lekhai, Scott J. Thomas, Cameron Deans
{"title":"A comparison of calcium sources for ion-trap loading via laser ablation","authors":"Daisy R. H. Smith, Silpa Muralidharan, Roland Hablützel, Georgina Croft, Klara Theophilo, Alexander Owens, Yashna N. D. Lekhai, Scott J. Thomas, Cameron Deans","doi":"10.1007/s00340-025-08521-z","DOIUrl":"10.1007/s00340-025-08521-z","url":null,"abstract":"<div><p>Trapped-ion technology is a leading approach for scalable quantum computing. A key element of ion trapping is reliable loading of atomic sources into the trap. While thermal atomic ovens have traditionally been used for this purpose, laser ablation has emerged as a viable alternative in recent years, offering the advantages of faster and more localized loading with lower heat dissipation. Calcium is a well-established ion for qubit applications. Here we examine a range of calcium sources for ablation and provide a comprehensive analysis of each. We consider factors such as ease of use, temperature and yield of the ablation plume, and the lifetime of ablation spots. For each target, we estimate the number of trappable atoms per ablation pulse for a typical surface and 3D ion trap.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12279569/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144697300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Applied Physics BPub Date : 2025-07-16DOI: 10.1007/s00340-025-08532-w
S. Armaghani, A. Rostami
{"title":"Enhancing entangled photon pair propagation through apodized bragg grating with advanced dispersion management","authors":"S. Armaghani, A. Rostami","doi":"10.1007/s00340-025-08532-w","DOIUrl":"10.1007/s00340-025-08532-w","url":null,"abstract":"<div><p>Quantum optical integrated circuits are revolutionizing quantum information processing by utilizing integrated photonics technology to create complex optical circuits on a single chip. Historically, these circuits encountered various challenges in quantum applications, but recent advancements have enabled them to meet the rigorous demands of both research and industry. A key area of exploration is the establishment and maintenance of quantum properties within photonic substrates. Bragg grating structures, essential for many optical applications, are anticipated to significantly contribute to the development of integrated circuits. However, they face a challenge with dispersion, which can threaten the integrity of quantum states. When entangled photons pass through a waveguide, their correlation function tends to broaden due to this dispersion. To address this issue, the study emphasizes the importance of apodizing the grating structure, as this can help reduce the broadening of the correlation function, provided that the apodization function’s standard deviation can adapt to variations in the refractive index. The proposal of apodized waveguide gratings aims to enhance the correlation of biphotons, offering a promising strategy for advancing the field.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166255","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}
Applied Physics BPub Date : 2025-07-14DOI: 10.1007/s00340-025-08524-w
Hongda Wu, Mingzhu Yuan, Feitong Chen, Dong Liu, Chong Liu
{"title":"16.8 GHz longitudinal mode spacing 486 nm blue laser for oceanic high-spectral-resolution lidar","authors":"Hongda Wu, Mingzhu Yuan, Feitong Chen, Dong Liu, Chong Liu","doi":"10.1007/s00340-025-08524-w","DOIUrl":"10.1007/s00340-025-08524-w","url":null,"abstract":"<div>\u0000 \u0000 <p>A sub-nanosecond blue laser with a large longitudinal mode spacing at 486 nm was demonstrated based on a frequency-doubled potassium titanyl phosphate optical parametric oscillator. The pump laser was a 532 nm green laser with a pulse width of 0.76 ns at the maximum pulse energy of 4 mJ. With a cavity optical length of 8.9 mm, the output energy of 972 nm signal laser reached 0.8 mJ, corresponding to a conversion efficiency of 20%. The signal laser was frequency-doubled to a blue laser with a longitudinal mode spacing of 16.8 GHz, matching the frequency spacing of seawater Brillouin scattering signal peaks excited by 486 nm laser. The spectral linewidth, pulse width and single pulse energy of the blue laser were 0.28 nm, 0.57 ns, and 80 μJ, respectively. This blue laser provides a reliable laser source for verifying the feasibility of multi-longitudinal-mode laser technique in oceanic high-spectral-resolution lidar.</p>\u0000 </div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165717","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}
Applied Physics BPub Date : 2025-07-11DOI: 10.1007/s00340-025-08506-y
Boyan Obreshkov, Tzveta Apostolova
{"title":"High-harmonic generation in zinc oxide subjected to intense mid-infrared femtosecond laser pulse","authors":"Boyan Obreshkov, Tzveta Apostolova","doi":"10.1007/s00340-025-08506-y","DOIUrl":"10.1007/s00340-025-08506-y","url":null,"abstract":"<div><p>We theoretically investigate photo-excitation of electron–hole pairs and high harmonic generation in the bulk of zinc oxide (ZnO) subjected to intense femto-second laser pulses with mid-infrared wavelength. The main microscopic mechanism of solid-state HHG is identified by separating resonant from non-resonant non-linear optical responses in the photo-excited solid. We obtain an effective light-matter interaction in which electrons are subject to weak atto-second pulse train with the second harmonic of the drive laser frequency being the repetition frequency in the train. Under a condition of constructive interference of electronic transitions between consecutive half-cycles of the drive laser pulse, resonant-like excitation of electron–hole pairs occurs which contribute to the multi-cycle accumulation of photo-current. The inter-band motion of charge carriers creates rapidly oscillating electric dipole moment, which emits continuum bremsstrahlung-like radiation during each half-cycle of the drive laser pulse. If the laser-cycles of the drive pulse are identical, the emissions from consecutive half-cycles are phase-coherent, and their mutual interference produces a frequency comb in the spectral domain, which is composed of the odd-integer harmonics of the drive laser frequency. The spectral intensity of each harmonic scales with the fourth power of the total number of cycles in the drive pulse. In contrast, if consecutive cycles in the pulse are non-identical, the interference pattern in the frequency domain is less well defined and blurred. The importance of the pulse envelope for producing clean frequency combs as observed in the experiments is discussed. Good semi-quantitative agreement with the experimental data is found: clean and well defined odd-order harmonic peaks extending well beyond the band edge of ZnO are exhibited for laser linearly polarized at right angles to the optical axis of the crystal.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164842","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}
Applied Physics BPub Date : 2025-07-11DOI: 10.1007/s00340-025-08510-2
Ali Mardan Dezfouli, Mario Rakić, Hrvoje Skenderović
{"title":"Complete modal characterization in Laguerre-Gaussian Beams using a paraboloid off-axis reflector","authors":"Ali Mardan Dezfouli, Mario Rakić, Hrvoje Skenderović","doi":"10.1007/s00340-025-08510-2","DOIUrl":"10.1007/s00340-025-08510-2","url":null,"abstract":"<div><p>Characterizing both the radial (p) and azimuthal (ℓ) indices of Laguerre-Gaussian (LG) beams remains a challenge mainly due to their transverse amplitude profiles. We report a simple yet robust method for simultaneously identifying both mode indices using an off-axis parabolic mirror (OPM). The far-field diffraction pattern produced by an incident LG beam on OPM exhibits characteristic spot distributions, which can be analyzed to determine the magnitude and sign of the topological charge, as well as the radial index. Furthermore, we show that this technique exhibits excellent tolerance to beam misalignment. Experimental results show good agreement with numerical simulations.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164790","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}
Applied Physics BPub Date : 2025-07-11DOI: 10.1007/s00340-025-08482-3
Mario De Lucia, Mahya Khorramshahi, Thomas Reisinger, Ioan Pop, Gerhard Ulbricht
{"title":"Measurement of optical absorption in granular aluminum thin films at room temperature","authors":"Mario De Lucia, Mahya Khorramshahi, Thomas Reisinger, Ioan Pop, Gerhard Ulbricht","doi":"10.1007/s00340-025-08482-3","DOIUrl":"10.1007/s00340-025-08482-3","url":null,"abstract":"<div><p>Because of their versatility and scalability, Microwave Kinetic Inductance Detectors (MKIDs) represent a rapidly developing class of cryogenic superconducting detectors. In the context of optical photon detectors, the efficiency of MKIDs faces limitations due to the reflection of visible and near-infrared (VIS-NIR) photons by low resistivity metallic films, which prevents a significant portion of incident photons from being absorbed and detected. To address this issue, we propose the use of granular Aluminum (grAl), a disordered superconductor which can achieve resistivity as high as 10 m<span>(Omega cdot)</span>cm. We measure optical transmission and reflection of grAl thin films in the wavelength range 400 nm to 1100 nm, from which we infer their absorption. Compared to other commonly used superconductors in the MKIDs community, for grAl we observe comparable or superior absorption, depending on the wavelength and the film thickness, which makes it a promising alternative material.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165131","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}
Applied Physics BPub Date : 2025-07-08DOI: 10.1007/s00340-025-08505-z
S. Sarkar, Vivek Singh, K. A. P. Singh, A. Chaudhary, V. B. Tiwari, S. R. Mishra
{"title":"On Rabi oscillations in ground hyperfine states of 87Rb atom driven by a microwave field","authors":"S. Sarkar, Vivek Singh, K. A. P. Singh, A. Chaudhary, V. B. Tiwari, S. R. Mishra","doi":"10.1007/s00340-025-08505-z","DOIUrl":"10.1007/s00340-025-08505-z","url":null,"abstract":"<div><p>We have observed the Rabi oscillations of the population of <span>(^{87}Rb)</span> atoms in the hyperfine ground state, when a cold atom cloud prepared in the hyperfine ground state (<span>(F = 1)</span>) was exposed to a microwave (MW) radiation field resonant to the <span>(|F = 1, m_{F} = 0>)</span> <span>(rightarrow)</span> <span>(|F = 2, m_{F} = 0>)</span> transition. After exposure to MW field, the atom cloud was imaged using the absorption probe method. The absorption images have revealed that population excited to the hyperfine state (<span>(F = 2)</span>) varied with the position in the atom cloud, showing the position dependent atom-field coupling strength. At a given position in the atom cloud, the excited population shows Rabi oscillations between two hyperfine states. Thus, we have demonstrated that by measuring the position dependent Rabi frequency, the spatial variation of magnetic field can be measured using a cold atom cloud.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-025-08505-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Study on the temporal evolution characteristics of Cu and Mo in a low-pressure environment using the FO-LIBS","authors":"Qi He, Shiming Liu, Boliang Men, Cong Li, Ding Wu, Ran Hai, Xingwei Wu, Hongbin Ding","doi":"10.1007/s00340-025-08522-y","DOIUrl":"10.1007/s00340-025-08522-y","url":null,"abstract":"<div><p>Fiber-Optic Laser-Induced Breakdown Spectroscopy (FO-LIBS) technology offers excellent remote diagnostic capabilities and flexibility in complex environments, making it highly promising for monitoring the elemental distribution in wall materials of future fusion devices. This study focused on the low-pressure conditions, where a FO-LIBS experimental system was developed to systematically analyze the temporal evolution of Cu and Mo plasma spectra under pressures ranging from 0.2 to 20 Pa. The results demonstrated that the intensities of key spectral lines, such as Cu I and Mo I, show linear growth with increasing laser energy within the specified pressure range. Additionally, the intensities of these characteristic spectral lines decrease significantly as pressure rises, becoming much weaker than at atmospheric pressure. The presence of an argon atmosphere further reduces these spectral line intensities. Time-resolved measurements indicate that plasma lifetimes are approximately 400 ns under 0.2 Pa, which happens earlier than under atmospheric pressure. Calculated electron densities, estimated using the Stark broadening method, correspond with the trends in spectral line intensity variations. This research provides optimized FO-LIBS parameter selection for in situ elemental diagnostics under low-pressure environments in fusion devices.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 8","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163279","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}