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Absolute modal wavefront reconstruction in a rotational shearing interferometer by iterative optimization. 通过迭代优化重建旋转剪切干涉仪中的绝对模态波前。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.545344
Huy Vu, Tiendung Vu
{"title":"Absolute modal wavefront reconstruction in a rotational shearing interferometer by iterative optimization.","authors":"Huy Vu, Tiendung Vu","doi":"10.1364/OL.545344","DOIUrl":"https://doi.org/10.1364/OL.545344","url":null,"abstract":"<p><p>We propose an iterative optimization approach for wavefront reconstruction in a rotational shearing interferometer based on Zernike polynomials. Two incorrect shearing amounts are optimized simultaneously, enabling the absolute reconstruction of wavefronts with high uniformity in the root mean square (<i>RMS</i>). Simulations under noisy conditions show that the reconstruction error, in terms of peak-to-valley (<i>PV</i>) and <i>RMS</i>, remains within the <i>μλ</i> range. The approach was experimentally validated by identifying asymmetric aberrations in an imperfectly collimated light source, showing strong agreement with the wavefront obtained from a Shack-Hartmann sensor.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"940-943"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Hundred-watt-level supercontinuum generation from an erbium-ytterbium doped fiber amplifier based on the cross-phase modulation. 基于交叉相位调制的掺铒镱光纤放大器产生百瓦级超连续真空。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.546595
Li Jiang, Rui Song, Kailong Li, Desheng Zhao, Jing Hou, Kai Han
{"title":"Hundred-watt-level supercontinuum generation from an erbium-ytterbium doped fiber amplifier based on the cross-phase modulation.","authors":"Li Jiang, Rui Song, Kailong Li, Desheng Zhao, Jing Hou, Kai Han","doi":"10.1364/OL.546595","DOIUrl":"https://doi.org/10.1364/OL.546595","url":null,"abstract":"<p><p>The pumping mechanism based on the cross-phase modulation (XPM) effect can achieve a flat broadband supercontinuum (SC) output. In this paper, we demonstrate a novel, to the best of our knowledge, scheme for SC generation from a large mode area (LMA) erbium-ytterbium co-doped fiber (EYDF) amplifier based on this XPM effect by utilizing both the gain and dispersion characteristics of the EYDF, achieving a hundred-watt-level flat broadband SC output. The scheme consists of two pulsed lasers with a synchronized trigger signal and a LMA-EYDF amplifier. In order to enhance the XPM effect effectively, the central wavelengths of two pulsed lasers are selected as 1030 nm and 1535 nm according to the calculated group velocity curve of the passive fiber in the EYDF amplifier. The output powers of 1030 nm and 1535 nm pulses are scaled to 58 W and 131 W after the EYDF, where the dual-wavelength is first amplified and the output power is the highest level in the 1 µm/1.5 µm dual-wavelength lasers reported so far. After the dual-wavelength lasers undergo the nonlinear accumulation in the EYDF amplifier, the final SC with a spectrum spanning the 770 nm-2055 nm at -10 dB level excluding the residual pump peak is achieved and an output power of 104 W is obtained. This is the widest spectral bandwidth at -10 dB level and the highest output power in the reported SC generation from an EYDF amplifier. This work provides a common platform to generate a high-power flat broadband SC independent of fiber design, further promoting the development of LMA fiber-based SC sources.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"1037-1040"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Isotropic and anisotropic edge enhancement using a lemon-star polarization dipole. 利用柠檬星极化偶极子实现各向同性和各向异性边缘增强。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.549873
Anuj Maurya, B S Bhargava Ram, Sarvesh Bansal, P Senthilkumaran
{"title":"Isotropic and anisotropic edge enhancement using a lemon-star polarization dipole.","authors":"Anuj Maurya, B S Bhargava Ram, Sarvesh Bansal, P Senthilkumaran","doi":"10.1364/OL.549873","DOIUrl":"https://doi.org/10.1364/OL.549873","url":null,"abstract":"<p><p>A spiral phase filter can perform a radial Hilbert transform (RHT) and is useful in isotropic edge enhancement. For selective edge enhancement, the inclusion of anisotropy warrants the filter to be replaced. In this Letter, we introduce for the first time, to our knowledge, a novel and versatile filter that can be tuned between isotropic/anisotropic edge detection and contrast enhancement protocols. To achieve this, we use a <i>lemon-star polarization dipole</i>: a special kind of spin-orbit beam that is a superposition of spin and orbital angular momentum states of light. We devised a 4<i>f</i> imaging setup in microscope configuration to encode the object Fourier spectrum into inhomogeneous polarization distribution. The novelty and advantages of the proposed method lie in selecting the spatial frequency content through polarization transformations in the image reconstruction path, just before the detector, without altering the Fourier plane parameters. Considering a scalar-to-vector diffraction approach and invoking the polarization degree of freedom of light, the edge enhancement capabilities of a lemon-star polarization dipole and a monopole (star or lemon) are shown through experiment results.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"1033-1036"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Low-complexity cluster-assisting look-up-table-based Volterra decision-feedback equalizer for IM/DD systems. 用于 IM/DD 系统的基于 Volterra 决策反馈均衡器的低复杂度集群辅助查找表。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.551003
Junwei Zhang, Heyun Tan, Alan Pak Tao Lau, Zhaohui Li, Chao Lu
{"title":"Low-complexity cluster-assisting look-up-table-based Volterra decision-feedback equalizer for IM/DD systems.","authors":"Junwei Zhang, Heyun Tan, Alan Pak Tao Lau, Zhaohui Li, Chao Lu","doi":"10.1364/OL.551003","DOIUrl":"https://doi.org/10.1364/OL.551003","url":null,"abstract":"<p><p>To address the challenges posed by chromatic dispersion (CD)-induced power fading and nonlinear signal distortions in double-sideband (DSB) intensity modulation and direct detection (IM/DD) transmission systems, a combination of a Volterra feed-forward equalizer (VFFE) and a Volterra decision-feedback equalizer (VDFE) is widely employed. However, the conventional VFFE-VDFE exhibits significant computational complexity, particularly for longer memory lengths. In this Letter, a low-complexity cluster-assisting look-up table-based VDFE (CLUT-VDFE) is proposed to effectively reduce the computational complexity associated with compensating for CD and nonlinear distortions. By utilizing CLUTs, all multiplication operations required for the implementation of the VDFE are completely eliminated. To validate the effectiveness of the proposed CLUT-VDFE, experiments on a C-band 100-Gb/s PAM-4 transmission system over a 60-km standard single-mode fiber (SSMF) are conducted. The experimental results show that the CLUT-VDFE not only achieves comparable equalization performance to the conventional VDFE but also effectively eliminates multiplication operations and significantly saves 48.8% real-valued additions.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"992-995"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Single-pass superluminescent diodes with grazing stripe waveguide.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.546571
N Yu Gordeev, A S Payusov, Yu M Shernyakov, G O Kornyshov, A A Beckman, M V Maximov
{"title":"Single-pass superluminescent diodes with grazing stripe waveguide.","authors":"N Yu Gordeev, A S Payusov, Yu M Shernyakov, G O Kornyshov, A A Beckman, M V Maximov","doi":"10.1364/OL.546571","DOIUrl":"https://doi.org/10.1364/OL.546571","url":null,"abstract":"<p><p>We report on an investigation of InGaAs/GaAs quantum well-dot superluminescent diodes (SLDs) based on what we believe to be a novel and simple design of stripe waveguides. The design employing a chip side facet as a component of the SLD structure allows effective suppression of optical feedback, thus increasing the optical power. The test SLDs under study emitting in 950-1150 nm spectral range show CW optical power as high as 150 mW in combination with broad emission spectra of 20 nm full width at half maximum (FWHM).</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"956-959"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Temperature-compensated ultra-stable optical cavity with re-entrant design.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.550052
Jialu Chang, Qiyue Wu, Zhiyuan Wang, Jingxuan Zhang, Qiang Wei, Xiaoxu Chen, Zehuang Lu, Jie Zhang
{"title":"Temperature-compensated ultra-stable optical cavity with re-entrant design.","authors":"Jialu Chang, Qiyue Wu, Zhiyuan Wang, Jingxuan Zhang, Qiang Wei, Xiaoxu Chen, Zehuang Lu, Jie Zhang","doi":"10.1364/OL.550052","DOIUrl":"https://doi.org/10.1364/OL.550052","url":null,"abstract":"<p><p>Ultra-stable optical cavities with adjustable zero-crossing temperatures feature low thermal expansion and low-temperature control power consumption. We develop a re-entrant cavity featuring flexible and nondestructive zero-crossing temperature tuning capabilities, with a tunable range of 49°C. Using the same ultra-low expansion glass (ULE) batch with a zero-crossing temperature of 16.0(4)°C, we experimentally demonstrate a re-entrant cavity with a higher zero-crossing temperature tuning to 24.7(4)°C, significantly increasing the operational range compared to traditional sandwich cavities. The ultra-stable laser system developed on this re-entrant cavity shows a thermal noise limited performance of 1.05(1) × 10<sup>-15</sup> at 0.2 s and a good long-term performance, making it suitable for portable applications such as space-borne laser sources.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"868-871"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Asymmetric reflection quantitative phase microscopy with a scalable field of view using dynamic speckle illumination.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.548001
Cong Wei, Zikun Li, Jingqi Xu, Nianfeng Wang, Ze Zhou, Jun Ma, Jin Huang, Lin Yao, Han Gu
{"title":"Asymmetric reflection quantitative phase microscopy with a scalable field of view using dynamic speckle illumination.","authors":"Cong Wei, Zikun Li, Jingqi Xu, Nianfeng Wang, Ze Zhou, Jun Ma, Jin Huang, Lin Yao, Han Gu","doi":"10.1364/OL.548001","DOIUrl":"https://doi.org/10.1364/OL.548001","url":null,"abstract":"<p><p>Dynamic speckle illumination-based quantitative phase microscopy (QPM) offers the capability to eliminate coherent noise and achieve depth selection; however, the low coherence of the illumination restricts the flexibility in objective lens selection. An asymmetric reflective quantitative phase microscopy method is proposed in this Letter. The speckle field correlation is maintained through identical exit pupil diameters in the objectives of both interference arms. Moreover, a light source system with a delay line compensates for the optical path difference introduced by the asymmetric objectives, thereby achieving a high-contrast interferogram. Experimental measurements on a resolution target and a transparent sample demonstrate the dynamic phase imaging and depth-selection capabilities of the system across different fields of view.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"820-823"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Microsphere-assisted super-resolution polarized light microscopy for polarization-sensitive materials.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.550156
Ran Ye, Xiangyu Zhang, Lingjie Zhi, Yurong Cao, Sorin Melinte, Zengbo Wang, Songlin Yang
{"title":"Microsphere-assisted super-resolution polarized light microscopy for polarization-sensitive materials.","authors":"Ran Ye, Xiangyu Zhang, Lingjie Zhi, Yurong Cao, Sorin Melinte, Zengbo Wang, Songlin Yang","doi":"10.1364/OL.550156","DOIUrl":"https://doi.org/10.1364/OL.550156","url":null,"abstract":"<p><p>Polarization sensitivity is a fundamental phenomenon observed in nature, and its application is vital for advancing scientific discoveries. Here, we present a microsphere-assisted polarized light microscopy method that enables high-quality, label-free super-resolution imaging of polarization-sensitive materials. We investigated the imaging performance of this method using various samples, including colloidal crystals and grating structures. Both simulations and experiments were performed to explore the underlying physical mechanisms driving the enhancement in imaging quality. The results of this work have potential values for the fields of polarized light microscopy and super-resolution imaging.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"908-911"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Observation of the collision and oscillation dynamics of dissipative dual-color solitons.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.550346
Zhezhe Li, Jiangyong He, Qiongqianhui Wang, Jin Li, Shihai Wang, Yu Ning, Mingtong Xiao, Lingyu Shen, Pan Wang, Yange Liu, Zhi Wang
{"title":"Observation of the collision and oscillation dynamics of dissipative dual-color solitons.","authors":"Zhezhe Li, Jiangyong He, Qiongqianhui Wang, Jin Li, Shihai Wang, Yu Ning, Mingtong Xiao, Lingyu Shen, Pan Wang, Yange Liu, Zhi Wang","doi":"10.1364/OL.550346","DOIUrl":"https://doi.org/10.1364/OL.550346","url":null,"abstract":"<p><p>Due to their potential as excellent dual-comb light sources, the dynamics of dual-color solitons within a single cavity have garnered widespread attention. In this work, we constructed a single-cavity ytterbium-doped passively mode-locked fiber laser (MLFL). By utilizing the birefringent filtering effect, dual-color solitons were successfully generated, and both collision and oscillatory dynamics of the dual-color solitons were observed. Using time-stretched dispersive Fourier transform (DFT), we revealed the details of these two distinct dynamical behaviors. We verified through numerical simulations that by adjusting the modulation depth and bandwidth of the filtering effect, it is possible to switch between the two distinct soliton dynamics behaviors. We believe that our research will contribute to the development of single-cavity dual-comb light sources and the exploration of nonlinear dynamics.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"980-983"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Wafer-scale mapping of carrier density and mobility with terahertz time-domain ellipsometry.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-02-01 DOI: 10.1364/OL.546091
Verdad C Agulto, Toshiyuki Iwamoto, Zixi Zhao, Shuang Liu, Kosaku Kato, Makoto Nakajima
{"title":"Wafer-scale mapping of carrier density and mobility with terahertz time-domain ellipsometry.","authors":"Verdad C Agulto, Toshiyuki Iwamoto, Zixi Zhao, Shuang Liu, Kosaku Kato, Makoto Nakajima","doi":"10.1364/OL.546091","DOIUrl":"https://doi.org/10.1364/OL.546091","url":null,"abstract":"<p><p>Terahertz (THz) measurements are increasingly valued for nondestructive testing of materials in power devices and other applications. Hence, there is a growing demand for highly accurate characterization methods in the THz range. Here we demonstrate the application of THz time-domain ellipsometry (THz-TDE) to large-scale, quantitative mapping of semiconductor wafers. While THz-TDE is an established technique, its application in wafer-scale mapping, which is an important process in the semiconductor industry, has not yet been demonstrated. In this work, we highlight the effectiveness of THz-TDE by mapping the electrical properties of a widely used semiconductor, silicon carbide (SiC). Spatial distribution maps of conductivity, carrier density, and mobility of a commercial 4-in. SiC wafer are derived using the measured ellipsometric parameters. THz-TDE mapping offers a nondestructive, contactless testing method to evaluate semiconductor quality and electrical homogeneity and is notably suitable for doped semiconductors characterized by high THz absorption.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"948-951"},"PeriodicalIF":3.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
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