Optics and Laser Technology最新文献_第2页

Rapid in-situ accuracy evaluation and exposure optimization method for fringe projection profilometry 条纹投影轮廓测量法的快速原位精度评估和曝光优化方法

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-24 DOI: 10.1016/j.optlastec.2024.111844

{"title":"Rapid in-situ accuracy evaluation and exposure optimization method for fringe projection profilometry","authors":"","doi":"10.1016/j.optlastec.2024.111844","DOIUrl":"10.1016/j.optlastec.2024.111844","url":null,"abstract":"<div><div>Fringe projection profilometry (FPP) has become one of the most powerful techniques for three-dimensional (3D) non-contact measurement. However, in practical scenarios, the various reflectivity of the unknown measured objects often greatly makes the system unable to achieve the theoretical precision under the same system parameter settings. Therefore, the adaptively system parameter setting is essential to be developed. In this paper, we propose a novel metric model, i.e. the accuracy quality function, for initial accuracy evaluation using in-situ acquired images under the current parameter settings. The causes that potentially affects the ultimate accuracy are analyzed via theoretical derivation and further adopted within the evaluation model. In addition, an optimal exposure selection method based just two images is carried out to fast adjusting. Experimental results demonstrated that the proposed accuracy quality model aligns well with the actual condition. Under optimal exposure, it achieved a significant reduction in phase error by 36.15% and by 21.39% in low- and high- exposure, highlighting its strong performance and potential for high-accuracy and in-situ 3D shape measurement applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315846","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

Thermoelectric and optoelectronic features of C- and N- doped CsZnBr3 halide perovskite for use in spin filter and energy efficient devices 掺杂 C 和 N 的 CsZnBr3 卤化物包晶的热电和光电特性，可用于自旋过滤器和高效节能设备

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-24 DOI: 10.1016/j.optlastec.2024.111833

{"title":"Thermoelectric and optoelectronic features of C- and N- doped CsZnBr3 halide perovskite for use in spin filter and energy efficient devices","authors":"","doi":"10.1016/j.optlastec.2024.111833","DOIUrl":"10.1016/j.optlastec.2024.111833","url":null,"abstract":"<div><div>Present study reports mainly thermoelectric and optical properties followed by its structural, electronic, magnetic properties of CsZnBr<sub>3</sub> halide perovskite using full potential linearized augmented plane wave method in the framework of density functional theory. Further we analyzed the impact of C and N on CsZnBr<sub>3</sub> for their electronic structure, magnetic nature, thermoelectric, and optical properties. CsZnBr<sub>3</sub> under optimum conditions exhibits a non-magnetic phase, which interestingly upon doping of C and N, turns out to be ferromagnetic with magnetic moments of 3.0 and 2.0 μ<sub>B</sub> for CsZnBr<sub>2</sub>C and CsZnBr<sub>2</sub>C, respectively. Furthermore, Semiconducting CsZnBr<sub>3</sub> exhibits spin filter semiconductor nature with energy band gaps of 1.38↑ and 3.26↓ eV for CsZnBr<sub>2</sub>C and 2.72↑ and 1.67↓ eV for CsZnBr<sub>2</sub>N. These doped materials can be used in spintronics as spin-filter devices for lower power consumption leading to more energy-efficient electronics. The thermoelectric parameters as Seebeck coefficient, power factor, thermal conductivity and figure of merit are estimated using BoltzTrap code. The figure of merit value found enhanced from 0.88 to 1.06 with one orientation of spins for CsZnBr<sub>2</sub>C at high temperature, which suggests its potential use in thermoelectric applications. In optical reference photon energy can be absorbed in UV-region.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315847","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

A mathematical model for ultrafast laser processing of the slight curvature surface 微曲率表面超快激光加工数学模型

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-23 DOI: 10.1016/j.optlastec.2024.111786

{"title":"A mathematical model for ultrafast laser processing of the slight curvature surface","authors":"","doi":"10.1016/j.optlastec.2024.111786","DOIUrl":"10.1016/j.optlastec.2024.111786","url":null,"abstract":"<div><div>The precise control of the amount of material removal in the ultrafast laser ablation process is hindered by a number of factors, rendering it unable to meet the demand for accurate processing of complex surfaces. It is essential to employ an effective simulation method to predict the outcomes of ablation processing, thereby facilitating subsequent optimisation of parameters and precision process research. In this paper, a pulse-by-pulse mathematical model is presented for simulating the ultrafast laser ablation process for general materials. The mathematical model of the focused Gaussian beam considers the influences of key parameters, including the propagation direction of the beam, the position of the focal point, and the laser fluence, among others. The evolution process of etching materials was analysed, and the material ablation rate under different beam states was calculated. The actual processing was then simulated pulse by pulse using the grid division method. The model is straightforward and accessible, with parameters determined through a limited number of calibration experiments. The simulation accuracy for points, lines, and planes is approximately 0.9, with a mean simulation time of 1.3 s for a single pulse. The ablation model is well-suited for simulating complex curved surfaces, offering a valuable tool for precise ultra-fast laser machining.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310749","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

Diode-pumped continuous-wave Nd:GSAG lasers operating at 1.4 μm 工作波长为 1.4 μm 的二极管泵浦连续波 Nd:GSAG 激光器

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-23 DOI: 10.1016/j.optlastec.2024.111846

引用次数: 0

2 × 2 arrayed, single-longitudinal-mode 1064-nm Nd:YVO4 laser with Dammann array pumping 采用达曼阵列泵浦的 2 × 2 阵列单纵模 1064 nm Nd:YVO4 激光器

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-23 DOI: 10.1016/j.optlastec.2024.111814

引用次数: 0

A multi-angle numerical model for laser cladding from the nozzle to cladding formation 激光熔覆从喷嘴到熔覆形成的多角度数值模型

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-23 DOI: 10.1016/j.optlastec.2024.111802

{"title":"A multi-angle numerical model for laser cladding from the nozzle to cladding formation","authors":"","doi":"10.1016/j.optlastec.2024.111802","DOIUrl":"10.1016/j.optlastec.2024.111802","url":null,"abstract":"<div><div>This study developed a comprehensive model that integrated fluid finite element computational mechanics, powder discrete element dynamics, and molten pool heat and mass transfer. The model accurately described the various phenomena occurring during the laser cladding process. This model, known as the multi-angle powder–gas–laser–liquid multiphase coupling model, extensively elucidated powder–gas transport, laser energy distribution, and heat and mass transfer within the molten pool. Additionally, the model comprehensively simulated the entire process of powder flow, from the nozzle to the formation of the cladding, even under varying substrate inclinations at different angles. Additionally, the study investigated the influence of substrate deflection angles, laser power, and scanning speed on the morphology of the cladding layer. The results revealed that as the substrate deflection angle varied from 0° to 150°, the height of the cladding layer first decreased and then increased, reaching a minimum value of 0.34 mm at 90°. Similarly, at a deflection angle of 90°, the width and offset of the layer first increased and then decreased, reaching peak values at 2.96 mm and 116 μm, respectively. However, the depth of the cladding layer displayed minimal variations, with an initial decrease followed by an increase. Moreover, as the laser power increased from 900 to 1500 W, the height, width, depth, and offset of the cladding layer gradually increased. Conversely, as the scanning speed increased from 5 to 11 mm/s, the dimensions of the layer gradually decreased. These findings address current challenges in numerical simulations, such as discontinuity and staging issues. Moreover, the findings provide valuable theoretical guidance for selecting and optimizing process parameters in multi-angle laser cladding, thereby filling a crucial knowledge gap.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310747","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

Characteristics of Y3Fe5O12 ceramic at mid-infrared wavelengths and its Faraday isolator application Y3Fe5O12 陶瓷在中红外波长下的特性及其在法拉第隔离器中的应用

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-23 DOI: 10.1016/j.optlastec.2024.111829

{"title":"Characteristics of Y3Fe5O12 ceramic at mid-infrared wavelengths and its Faraday isolator application","authors":"","doi":"10.1016/j.optlastec.2024.111829","DOIUrl":"10.1016/j.optlastec.2024.111829","url":null,"abstract":"<div><div>Compared to the commonly used 1 μm wavelength Faraday isolators (FIs), the performance of existing mid-infrared FIs remains unsatisfactory due to the lack of suitable magneto-optic (MO) candidate materials. In this study, we described a novel mid-infrared FI based on Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> (YIG) MO ceramics for the first time. The Faraday effects of YIG ceramics synthesized by hot-press sintering were tested and compared with those of commercial YIG single crystals and Bi-doped iron garnet (BIG) films. Faraday rotation angles of 114 deg/cm at 2.1 µm and 60 deg/cm at 3.8 µm have been demonstrated in YIG ceramics. The YIG ceramic-based FI exhibited an extinction ratio of 25.26 dB and an insertion loss of 1.01 dB at 2.1 µm, while the YIG ceramic-based Faraday rotator showed an extinction ratio of 28.30 dB and an insertion loss of 1.17 dB at 3.8 µm. Under high repetition rate pulsed laser radiation, surface damage was observed for both the YIG ceramic and the YIG crystal at similar laser power densities. Given its size scalability, further improvement in the optical quality of YIG ceramic is expected to provide a superior approach for realizing high power mid-infrared FIs.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310745","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

Widely tunable narrow-linewidth ZGP optical parametric oscillator with injection of single frequency seed 注入单频种子的宽可调窄线宽 ZGP 光参量振荡器

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-23 DOI: 10.1016/j.optlastec.2024.111834

{"title":"Widely tunable narrow-linewidth ZGP optical parametric oscillator with injection of single frequency seed","authors":"","doi":"10.1016/j.optlastec.2024.111834","DOIUrl":"10.1016/j.optlastec.2024.111834","url":null,"abstract":"<div><div>In the absence of wavelength selection elements, the output spectrum of a ZnGeP<sub>2</sub> (ZGP) optical parametric oscillator (OPO) is typically much broader than the pump spectrum due to the large parametric spectral gain bandwidth of the ZGP crystal. In this paper, we construct a narrow-linewidth ring cavity ZGP-OPO with an injection of 3.8 μm single-frequency MgO:PPLN laser. This setting achieved effective compression of the linewidth of signal and idler light, and the corresponding maximum output power of signal and idler light were 9.6 W and 6.85 W with a repetition rate of 15 kHz. With seed injection, the full width half maximum (FWHM) of linewidth of the signal light was compressed from 21.84 nm to 0.42 nm at 3816.89 nm, and the linewidth of idler light was compressed from 28.62 nm to 0.74 nm at 4622.06 nm. Furthermore, we investigated the spectral tuning characteristics, achieving a tuning range of 3696.08––3827.14 nm for signal light, corresponding to a tuning bandwidth of 131.06 nm. And the tuning range for the idler light was from 4604.48 to 4808.66 nm, corresponding to a tuning bandwidth of 204.18 nm. Our work proved that the spectrum linewidth of ZGP-OPO can be effectively compressed by seed injection technology.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310748","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

Laser ablation behavior of Al0.2CrNbTiV refractory high-entropy alloy coating deposited by high speed laser cladding 高速激光熔覆沉积的 Al0.2CrNbTiV 难熔高熵合金涂层的激光烧蚀行为

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-22 DOI: 10.1016/j.optlastec.2024.111816

{"title":"Laser ablation behavior of Al0.2CrNbTiV refractory high-entropy alloy coating deposited by high speed laser cladding","authors":"","doi":"10.1016/j.optlastec.2024.111816","DOIUrl":"10.1016/j.optlastec.2024.111816","url":null,"abstract":"<div><div>Al<sub>0.2</sub>CrNbTiV refractory high-entropy alloy coating were deposited on the surface of Ti-6Al-4V titanium alloy by high-speed laser cladding technology. The laser ablation resistance of Al<sub>0.2</sub>CrNbTiV coating is studied, and the results show that the coating can hinder laser ablation with a relatively flat ablation region formed in a diameter of ∼2100 μm and depth of ∼150 μm, which was mainly the reason of the structural characteristics of the Al-Cr-Nb-Ti-V high-entropy alloy system and the formation of the multiple oxides. Due to the high structural stability of Al-Cr-Nb-Ti-V system and good structural matching with Ti element, the diffused Ti from the substrate can be dissolved in the multi- principal elements high-entropy alloy, preventing the direct formation of series none-protective Ti oxides, with (Ti, Nb, V)O<em><sub>x</sub></em>, AlTi<sub>3</sub>O<sub>6</sub>, Al<sub>2</sub>TiO<sub>5</sub>/AlTi<sub>2</sub>O<sub>5</sub> eutectic and other oxides formed instead. At the same time, the vaporization of CrO<sub>3</sub> could remove a significant amount of heat, and the formation of low melting point Al<sub>2</sub>TiO<sub>5</sub>/AlTi<sub>2</sub>O<sub>5</sub> eutectic can reduce the surface temperature, relieve stress, fill cracks of the coating. Furthermore, Al<sub>0.2</sub>CrNbTiV coating has a higher thermal conductivity than the titanium substrate, conducive to heat loss and the coating remains relatively dense with no peeling or penetrating crack formed during the ablation process, which improve the flame-retardant property of the Al<sub>0.2</sub>CrNbTiV coating synergistically.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310744","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

Microstructure and mechanical properties of TiC/Ti6Al4V composite fabricated by concurrent wire-powder feeding laser-directed energy deposition 通过线-粉喂激光定向能沉积法制造的 TiC/Ti6Al4V 复合材料的微观结构和力学性能

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2024-09-22 DOI: 10.1016/j.optlastec.2024.111836

{"title":"Microstructure and mechanical properties of TiC/Ti6Al4V composite fabricated by concurrent wire-powder feeding laser-directed energy deposition","authors":"","doi":"10.1016/j.optlastec.2024.111836","DOIUrl":"10.1016/j.optlastec.2024.111836","url":null,"abstract":"<div><div>Laser-directed energy deposition concurrent wire-powder feeding (L-DED-WP) combines the advantages of wire-feeding and powder-feeding laser deposition, offering a novel method for fabricating metal matrix composites at a lower cost and higher efficiency. This work successfully produced defect-free Ti6Al4V alloy and TiC/Ti6Al4V composites using wire-feeding laser deposition and L-DED-WP, respectively. L-DED-WP process was achieved by lateral feeding of Ti6Al4V wire and coaxial feeding of TiC particles, with an additional TiC content of 2.93 wt%. The microstructure characteristics and mechanical performance of Ti6Al4V alloy and TiC/Ti6Al4V composites were analysed. The results indicate that after adding TiC particles, the in-situ eutectic-TiC precipitated in the matrix. Due to the uneven distribution of TiC particles along the build direction during solidification, the quantity of eutectic-TiC gradually increased from the bottom to the middle and top regions of the deposition layer. Correspondingly, the morphology of eutectic-TiC was granular at the bottom, short rod-like in the middle, and a mix of both granular and short rod-like in the top region. Additionally, the eutectic-TiC served as heterogeneous nucleation sites, promoting the refinement and inhibiting the growth of α-Ti, resulting in a decreased aspect ratio of α-Ti and texture strength. Compared to Ti6Al4V, the yield strength of TiC/Ti6Al4V increased by 11.19 %, while the tensile strength improved by 11.46 %. However, during the tensile testing, the non-uniformly distributed brittle eutectic-TiC could only release stress by fracturing, resulting in a 2.57 % decrease in elongation.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310743","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