Applied Physics BPub Date : 2026-08-01DOI: 10.1007/s00340-026-08699-w
Katrin Meier, Arvid Klösgen, Kerstin Harland, Lina Hansen, Lars Barnekow, Chen Guo, Caroline Juliano, Jin Niu, Cord L. Arnold, Jan Vogelsang
{"title":"Multiscale carrier-envelope phase characterization of 2-µm pulses delivered by a 200-kHz optical parametric amplifier","authors":"Katrin Meier, Arvid Klösgen, Kerstin Harland, Lina Hansen, Lars Barnekow, Chen Guo, Caroline Juliano, Jin Niu, Cord L. Arnold, Jan Vogelsang","doi":"10.1007/s00340-026-08699-w","DOIUrl":"10.1007/s00340-026-08699-w","url":null,"abstract":"<div><p>Light fields with a central wavelength of 2 µm are very well suited for strong-field-driven charge carrier control: Their photon energy lies far below the band gap of many materials, while their oscillation period remains significantly shorter than the coherence time of charge carrier oscillations. The resulting potential for field-driven charge carrier control is contingent on the reproducibility of the field structure of such ultrashort laser pulses. Here, we present a compact 200-kHz laser system that delivers ultrashort pulses with a duration of less than 20 fs in the spectral range around 2 µm and with a pulse energy of 25 µJ. The electric field structure of the 2-µm pulses is characterized in detail. In particular, the carrier-envelope phase (CEP) is measured over a wide range of timescales, from microseconds to hours. Passive stabilization due to difference frequency generation results in a root mean square value of carrier-envelope phase noise of less than 70 mrad over all measured time scales. The applicability of the pulses is demonstrated by measuring CEP-dependent high-order harmonic spectra with energies of up to 160 eV.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08699-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148628493","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":"Physics-guided stepwise tomography framework for high-precision reconstruction of temperature and concentration","authors":"Yaojie Jia, Dongdong Pang, Jiarui Lei, Peng Liu, Xin Zhou","doi":"10.1007/s00340-026-08707-z","DOIUrl":"10.1007/s00340-026-08707-z","url":null,"abstract":"<div><p>This paper presents a physics-guided stepwise tomography framework that decouples the ill-posed tomography of temperature and concentration into three measurement- and prior-guided stages. By sequentially embedding two-line thermometry, projection matrix, and structural similarity, the framework first reconstructs a preliminary temperature field via a physics-data collaborative network, then employs it as a structural prior to guide iterative concentration inversion, and finally restores spatial details through a joint superresolution network, achieving high-fidelity reconstruction under a sparse optical layout with 40 optical paths and 2 absorption lines. Comprehensive validation in three cases supports improved robustness in the tested cases. In Case A, an in-distribution LES test dataset achieved dataset-averaged temperature/concentration mean relative errors (<span>(E_T/E_X)</span>) of 1.35%/2.51% and temperature/concentration structural similarity indices (<span>(SSIM_T/SSIM_X)</span>) of 0.991/0.989. In Case B, an out-of-distribution LES flame with modified inlet conditions showed section-dependent performance, with representative noise-free longitudinal sections giving <span>(E_T=4.54%-7.67%)</span>, <span>(E_X=5.55%-14.11%)</span>, <span>(SSIM_T=0.742-0.974)</span>, and <span>(SSIM_X=0.763-0.965)</span>. In Case C, an experimentally derived axisymmetric flame case constructed from Sandia Flame D measurements further showed that the main jet, reaction-zone, and diffusion-region structures can still be captured; representative cross-sections achieved <span>(E_T<5%)</span>, <span>(E_X<8%)</span>, <span>(SSIM_T>0.98)</span>, and <span>(SSIM_X>0.96)</span>. This strategy provides a promising route toward real-time combustion diagnostics in geometrically complex environments with restricted optical access.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08707-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614401","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":"Correction: Modulation of optical properties of adipose tissue in diabetes mellitus associated with its glycation and hydration","authors":"Irina Yanina, Kirill Berezin, Daria Tuchina, Natalia Shushunova, Ekaterina Stepanovich, Alla Bucharskaya, Artyom Mylnikov, Nikita Navolokin, Valery Tuchin","doi":"10.1007/s00340-026-08705-1","DOIUrl":"10.1007/s00340-026-08705-1","url":null,"abstract":"","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08705-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613651","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 : 2026-07-21DOI: 10.1007/s00340-026-08706-0
Spencer C. Barnes, Sean Clees, Joshua A. Vandervort, Christopher L. Strand, Ronald K. Hanson
{"title":"High-temperature spectrally resolved NO laser-induced fluorescence for temperature and pressure measurement using a rapidly tunable UV laser","authors":"Spencer C. Barnes, Sean Clees, Joshua A. Vandervort, Christopher L. Strand, Ronald K. Hanson","doi":"10.1007/s00340-026-08706-0","DOIUrl":"10.1007/s00340-026-08706-0","url":null,"abstract":"<div><p>Spatially resolved, quantitative laser diagnostics are needed to understand high-temperature and high-speed flow fields. To that end, a spectrally resolved laser-induced fluorescence diagnostic targeting nitric oxide (in bath gases of Ar and N<sub>2</sub>) was developed and validated in a series of static cell and shock tube experiments. Also, a spectrally resolved fluorescence model was created to simulate the underlying processes of diatomic spectrally resolved fluorescence and quantify the maximum theoretical measurement rate under various conditions. The diagnostic was validated from 295–1350 K and 2.1–47.0 kPa, and validation experiments showed good agreement with known values—a 3.0% and 5.5% average error in temperature and pressure (for collisional-to-Doppler width ratios greater than 0.30), respectively.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08706-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613652","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 : 2026-07-19DOI: 10.1007/s00340-026-08702-4
Wenjie Nie, Qiang Ling, Jiayi Liu, Lingyu Wang, Anping Xiao, Jie Du, Yanhong Li, Ying Wang, Barerem-Melgueba Mao, Zhangwei Yu, Zhengtian Gu, Daru Chen
{"title":"Highly sensitive micro-curvature sensor based on double-clad polarization-maintaining fiber","authors":"Wenjie Nie, Qiang Ling, Jiayi Liu, Lingyu Wang, Anping Xiao, Jie Du, Yanhong Li, Ying Wang, Barerem-Melgueba Mao, Zhangwei Yu, Zhengtian Gu, Daru Chen","doi":"10.1007/s00340-026-08702-4","DOIUrl":"10.1007/s00340-026-08702-4","url":null,"abstract":"<div><p>Precise measurement of micro-curvature enables early detection of issues before they reach critical levels, facilitating preventive maintenance and mitigating the risk of significant economic losses and safety hazards. In this paper, we proposed and experimentally demonstrated an innovative sensor for dual parametric simultaneous measurement based on Sagnac-interferometer (SI) constructed by double-clad polarization-maintaining fiber (DPMF). The sensor is designed using a 2 × 2 coupler to connect the DPMF, forming an optical fiber loop structure while granted with a Fiber Bragg granting (FBG). The experiment proves that the SI exhibits curvature sensitivity of − 89.1 nm/m<sup>−1</sup> from 0.062 to 0.176 m<sup>−1</sup> and − 179.09 nm/m<sup>−1</sup> from 0.186 to − 0.26 m<sup>−1</sup> while temperature sensitivity of − 1.65 nm/°C. By adding FBG to realize dual parametric simultaneous measurement. The FBG has showed sensitivities of curvature and temperature are − 6.97 nm/m<sup>−1</sup> and 0.009 nm/°C. The coefficient matrix approach is employed to simultaneously measure both curvature and temperature. The sensor exhibits ultra-high curvature resolution of 1.1 × 10<sup>−4</sup> m<sup>−1</sup> and achieves dual-parameter simultaneous measurement for curvature and temperature through a simple fabrication process. Its characteristics of high sensitivity and resolution, low production costs, and straightforward manufacturing make its application prospects in industrial manufacturing and aerospace fields broader.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08702-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613413","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 : 2026-07-17DOI: 10.1007/s00340-026-08703-3
Moritz Badtke, Sascha Kalusniak, Ole Hahn, Hiroki Tanaka, Christian Kränkel
{"title":"Green Tb3+:ZBLAN fiber laser","authors":"Moritz Badtke, Sascha Kalusniak, Ole Hahn, Hiroki Tanaka, Christian Kränkel","doi":"10.1007/s00340-026-08703-3","DOIUrl":"10.1007/s00340-026-08703-3","url":null,"abstract":"<div><p>We demonstrate continuous-wave laser operation of a terbium (Tb<sup>3+</sup>)-doped ZBLAN fiber emitting in the green spectral region. Under pumping at 486 nm, laser oscillation at 542 nm was achieved in a 4 m long Tb<sup>3+</sup>:ZBLAN double-clad fiber. A maximum output power of 6.2 mW was obtained with a slope efficiency of 1.2% with respect to the launched pump power and 4.1% not taking into account the transmitted pump light. Versus the actual absorbed pump power, the efficiency is estimated to be comparable to crystalline fluoride hosts. The results represent a significant improvement over previously reported Tb<sup>3</sup>⁺-doped fiber lasers and highlight the potential of fluoride fibers for compact visible laser sources provided sufficient absorption efficiency can be achieved.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08703-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466235","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 : 2026-07-14DOI: 10.1007/s00340-026-08704-2
Tatsuki Tahara
{"title":"Thermal-light self-reference digital holographic microscopy with submicron resolution","authors":"Tatsuki Tahara","doi":"10.1007/s00340-026-08704-2","DOIUrl":"10.1007/s00340-026-08704-2","url":null,"abstract":"<div><p>I designed and experimentally performed digital holographic microscopy (DHM) in which a halogen lamp is used as a light source and theoretical two-point resolution is submicron. The DHM system consists of a commercially available optical microscope and a common-path self-reference in-line digital holography system. Quantitative phase imaging of a three-dimensional (3D) object is performed without speckle noise. 3D imaging of an object containing submicron apertures is performed with temporally incoherent thermal light.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08704-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465726","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 : 2026-07-03DOI: 10.1007/s00340-026-08700-6
Irina Yanina, Kirill Berezin, Daria Tuchina, Natalia Shushunova, Elena Stepanovich, Alla Bucharskaya, Artyom Mylnikov, Nikita Navolokin, Valery Tuchin
{"title":"Modulation of optical properties of adipose tissue in diabetes mellitus associated with its glycation and hydration","authors":"Irina Yanina, Kirill Berezin, Daria Tuchina, Natalia Shushunova, Elena Stepanovich, Alla Bucharskaya, Artyom Mylnikov, Nikita Navolokin, Valery Tuchin","doi":"10.1007/s00340-026-08700-6","DOIUrl":"10.1007/s00340-026-08700-6","url":null,"abstract":"<div><p>Diabetes mellitus (DM) is a group of metabolic diseases characterized by chronic hyperglycemia, which develops due to insulin resistance (T2DM), insulin deficiency, or glucagon overproduction (T1DM). One of the key consequences of hyperglycemia is nonenzymatic glycation of biomolecules, including proteins, lipoproteins, and lipids. The aim of this study was to determine the optical properties of adipose tissue in healthy rats and rats with experimentally induced T1DM using multiwavelength refractometry and spectroscopy, followed by data verification through histological analysis and molecular modeling. Glycation of collagen and phosphatidylethanolamine was shown to lead to expansion and destabilization of their hydration shells. A comprehensive analysis revealed a correlation between optical properties, structural changes in tissues, and their hydration. The differences in the optical properties of abdominal fat, arising from pathological glycation and hydration, could enable the development of label-free optical methods to monitor T1DM in experimental settings. This approach may ultimately support new strategies for predicting, diagnosing, and tracking the progression of T1DM in humans.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08700-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148366003","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 : 2026-06-24DOI: 10.1007/s00340-026-08698-x
Florian Bienert, Christian Schmittner, Christoph Röcker, Andreas Michalowski, Thomas Graf, Marwan Abdou Ahmed
{"title":"Determination of misalignment in a multi-pass amplifier using a neural network","authors":"Florian Bienert, Christian Schmittner, Christoph Röcker, Andreas Michalowski, Thomas Graf, Marwan Abdou Ahmed","doi":"10.1007/s00340-026-08698-x","DOIUrl":"10.1007/s00340-026-08698-x","url":null,"abstract":"<div><p>We present the first step towards an intelligent thin-disk multi-pass amplifier (I-TDMPA), by simulatively proving the ability of a neural network (NN) for the detection of misalignment. A digital twin of one of our experimental systems was implemented using a specifically developed ray tracing simulation. The digital twin was used to generate more than 200,000 sets of training data to train a neural network (NN) with the goal to be able to determine misalignment of the many optical elements of a multi-pass amplifier in a simulation model, solely by observing the beam. The predictions of the NN agree very well with the simulated misalignments, which confirms the suitability of artificial-intelligence methods to ensure a safe and stable operation of complex optical systems.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 7","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08698-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323326","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 : 2026-06-15DOI: 10.1007/s00340-026-08695-0
Ryo Aoki, Ryo Kondo, Kenya Sugimoto, Fan Wang, Tomoyoshi Ito, Tomoyoshi Shimobaba
{"title":"Data compression for single-pixel imaging using audio codecs","authors":"Ryo Aoki, Ryo Kondo, Kenya Sugimoto, Fan Wang, Tomoyoshi Ito, Tomoyoshi Shimobaba","doi":"10.1007/s00340-026-08695-0","DOIUrl":"10.1007/s00340-026-08695-0","url":null,"abstract":"<div><p>Single-pixel imaging (SPI) reconstructs an object’s image via computational methods using a single-point photodetector and a sequence of mask patterns. A fundamental trade-off exists in SPI between the sampling rate and the fidelity of the reconstructed image: while increasing the number of patterns enhances image quality, it simultaneously scales the volume of the measured light intensity data. In this study, we propose a SPI data compression based on audio compression technology, taking advantage of the fact that light intensity data is inherently one-dimensional. Our results demonstrate that the Free Lossless Audio Codec algorithm achieves significantly higher compression ratios than conventional lossless methods based on LZ77 and Huffman coding, without compromising image quality. Furthermore, we show that lossy formats such as MP3 and Ogg Vorbis can achieve even higher compression ratios, albeit with minor degradation in the final reconstruction.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"132 7","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-026-08695-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281231","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}