Progress in Optics最新文献_第10页

Micro-Machining of Diamond, Sapphire and Fused Silica Glass Using a Pulsed Nano-Second Nd:YVO4 Laser 脉冲纳秒Nd:YVO4激光微加工金刚石、蓝宝石和熔融石英玻璃

3区物理与天体物理

Progress in Optics Pub Date : 2021-08-17 DOI: 10.3390/opt2030016

D. Waugh, C. Walton

{"title":"Micro-Machining of Diamond, Sapphire and Fused Silica Glass Using a Pulsed Nano-Second Nd:YVO4 Laser","authors":"D. Waugh, C. Walton","doi":"10.3390/opt2030016","DOIUrl":"https://doi.org/10.3390/opt2030016","url":null,"abstract":"Optically transparent materials are being found in an ever-increasing array of technological applications within industries, such as automotive and communications. These industries are beginning to realize the importance of implementing surface engineering techniques to enhance the surface properties of materials. On account of the importance of surface engineering, this paper details the use of a relatively inexpensive diode-pumped solid state (DPSS) Nd:YVO4 laser to modify the surfaces of fused silica glass, diamond, and sapphire on a micrometre scale. Using threshold fluence analysis, it was identified that, for this particular laser system, the threshold fluence for diamond and sapphire ranged between 10 Jcm−2 and 35 Jcm−2 for a laser wavelength of 355 nm, dependent on the cumulative effects arising from the number of incident pulses. Through optical microscopy and scanning electron microscopy, it was found that the quality of processing resulting from the Nd:YVO4 laser varied with each of the materials. For fused silica glass, considerable cracking and deformation occurred. For sapphire, good quality features were produced, albeit with the formation of debris, indicating the requirement for post-processing to remove the observed debris. The diamond material gave rise to the best quality results, with extremely well defined micrometre features and minimal debris formation, comparative to alternative techniques such as femtosecond laser surface engineering.","PeriodicalId":54548,"journal":{"name":"Progress in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73256355","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}

引用次数: 2

A Preliminary Investigation on the Photothermal Properties of Luminescent Solar Concentrators 发光太阳能聚光器光热性能的初步研究

3区物理与天体物理

Progress in Optics Pub Date : 2021-08-05 DOI: 10.3390/opt2030014

Yilin Li, Yujian Sun, Yongcao Zhang, Wenji Dong

引用次数: 1

Design Simulation of Czerny–Turner Configuration-Based Raman Spectrometer Using Physical Optics Propagation Algorithm 基于物理光学传播算法的Czerny-Turner组态拉曼光谱仪设计仿真

3区物理与天体物理

Progress in Optics Pub Date : 2021-07-31 DOI: 10.3390/opt3010001

Muddasir Naeem, Noor-ul-ain Fatima, M. Hussain, T. Imran, A. Bhatti

{"title":"Design Simulation of Czerny–Turner Configuration-Based Raman Spectrometer Using Physical Optics Propagation Algorithm","authors":"Muddasir Naeem, Noor-ul-ain Fatima, M. Hussain, T. Imran, A. Bhatti","doi":"10.3390/opt3010001","DOIUrl":"https://doi.org/10.3390/opt3010001","url":null,"abstract":"We report the design simulation of the Raman spectrometer using Zemax optical system design software. The design is based on the Czerny–Turner configuration, which includes an optical system consisting of an entrance slit, two concave mirrors, reflecting type diffraction grating and an image detector. The system’s modeling approach is suggested by introducing the corresponding relationship between detector pixels and wavelength, linear CCD receiving surface length and image surface dimension. The simulations were carried out using the POP (physical optics propagation) algorithm. Spot diagram, relative illumination, irradiance plot, modulation transfer function (MTF), geometric and encircled energy were simulated for designing the Raman spectrometer. The simulation results of the Raman spectrometer using a 527 nm wavelength laser as an excitation light source are presented. The present optical system was designed in sequential mode and a Raman spectrum was observed from 530 nm to 630 nm. The analysis shows that the system’s image efficiency was quite good, predicting that it could build an efficient and cost-effective Raman spectrometer for optical diagnostics.","PeriodicalId":54548,"journal":{"name":"Progress in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73173833","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}

引用次数: 2

Biochemical Profiles of In Vivo Oral Mucosa by Using a Portable Raman Spectroscopy System 便携式拉曼光谱系统在体内口腔黏膜的生化特征研究

3区物理与天体物理

Progress in Optics Pub Date : 2021-07-16 DOI: 10.3390/OPT2030013

Marcelo Saito Nogueira, Victória Ribeiro, M. Pires, F. Peralta, L.F.C.S. Carvalho

{"title":"Biochemical Profiles of In Vivo Oral Mucosa by Using a Portable Raman Spectroscopy System","authors":"Marcelo Saito Nogueira, Victória Ribeiro, M. Pires, F. Peralta, L.F.C.S. Carvalho","doi":"10.3390/OPT2030013","DOIUrl":"https://doi.org/10.3390/OPT2030013","url":null,"abstract":"Most oral injuries are diagnosed by histopathological analysis of invasive and time-consuming biopsies. This analysis and conventional clinical observation cannot identify biochemically altered tissues predisposed to malignancy if no microstructural changes are detectable. With this in mind, detailed biochemical characterization of normal tissues and their differentiation features on healthy individuals is important in order to recognize biomolecular changes associated with early tissue predisposition to malignant transformation. Raman spectroscopy is a label-free method for characterization of tissue structure and specific composition. In this study, we used Raman spectroscopy to characterize the biochemistry of in vivo oral tissues of healthy individuals. We investigated this biochemistry based on the vibrational modes related to Raman spectra of four oral subsites (buccal, gingiva, lip and tongue) of ten volunteers as well as with principal component (PC) loadings for the difference between the four types of oral subsites. Therefore, we determined the biochemical characteristics of each type of healthy oral subsite and those corresponding to differentiation of the four types of subsites. In addition, we developed a spectral reference of oral healthy tissues of individuals in the Brazilian population for future diagnosis of early pathological conditions using real-time, noninvasive and label-free techniques such as Raman spectroscopy.","PeriodicalId":54548,"journal":{"name":"Progress in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75778765","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}

引用次数: 9

Design of Refractive/Diffractive Hybrid Projection Lens for DMD-Based Maskless Lithography 基于dmd无掩模光刻的折射/衍射混合投影透镜设计

3区物理与天体物理

Progress in Optics Pub Date : 2021-06-08 DOI: 10.3390/OPT2020011

Zhuohui Xu, Jinyun Zhou, Bo Wang, Ziming Meng

引用次数: 0

A 100 Gbps OFDM-Based 28 GHz Millimeter-Wave Radio over Fiber Fronthaul System for 5G 基于100gbps ofdm的5G光纤前传28 GHz毫米波无线电系统

3区物理与天体物理

Progress in Optics Pub Date : 2021-06-01 DOI: 10.3390/OPT2020008

J. Gadze, R. Akwafo, K. Agyekum, K. A. Opare

{"title":"A 100 Gbps OFDM-Based 28 GHz Millimeter-Wave Radio over Fiber Fronthaul System for 5G","authors":"J. Gadze, R. Akwafo, K. Agyekum, K. A. Opare","doi":"10.3390/OPT2020008","DOIUrl":"https://doi.org/10.3390/OPT2020008","url":null,"abstract":"Due to the unprecedented growth in mobile data traffic, emerging mobile access networks such as fifth-generation (5G) would require huge bandwidth and a mobile fronthaul architecture as an essential solution in providing a high capacity for support in the future. To increase capacity, utilizing millimeter waves (mm-waves) in an analog radio over fiber (RoF) fronthaul link is the major advancement and solution in achieving higher bandwidth and high data rate to cater for 5G mobile communication. In this paper, we demonstrate the feasibility of transmission and reception of a 100 Gbits/s data rate link at 28 GHz. The performance of three modulation formats (16-PSK, 16-QAM and 64-QAM) have been compared for an optical fiber length from 5 km up to 35 km for two detection systems; coherent and direct detection. Also, in this paper, the transmission impairments inherent to transmission systems are realized through the implementation of a digital signal processing (DSP) compensation scheme in the receiver system to enhance system performance. Quality factor (QF) and bit error rate (BER) are used as metrics to evaluate the system performance. The proposed system model is designed and simulated using Optisystem 16.","PeriodicalId":54548,"journal":{"name":"Progress in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89172719","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}

引用次数: 2

Modelling Dispersion Compensation in a Cascaded-Fiber-Feedback Optical Parametric Oscillator 级联光纤反馈光参量振荡器色散补偿的建模

3区物理与天体物理

Progress in Optics Pub Date : 2021-05-28 DOI: 10.3390/OPT2020010

Ewan Allan, C. Ballantine, Sebastian C. Robarts, D. Bajek, R. McCracken

引用次数: 0

Raman and Surface-Enhanced Raman Spectroscopy of Fatty Acids and Lipids 脂肪酸和脂类的拉曼光谱和表面增强拉曼光谱

3区物理与天体物理

Progress in Optics Pub Date : 2021-05-27 DOI: 10.11648/J.OPTICS.20211001.12

Eric Amankwa

{"title":"Raman and Surface-Enhanced Raman Spectroscopy of Fatty Acids and Lipids","authors":"Eric Amankwa","doi":"10.11648/J.OPTICS.20211001.12","DOIUrl":"https://doi.org/10.11648/J.OPTICS.20211001.12","url":null,"abstract":"The goal of this thesis was to study, determine, and measure Raman and surface-enhanced Raman spectroscopy (SERS) of fatty acids and lipids. Firstly, the Raman measurement was done using silver substrate where the activation process was achieved by focusing crystals of green laser radiation 5 mW power at 5 minutes on the silver substrate. The Raman measurement again was done using Invia Raman Spectroscopy with 514 nm excitation and objective 100x magnification where the samples to be measured were incubated using RH6G (good signal analyzer). After the incubation process, the samples were rinsed with water and allowed to dry for 5 minutes where ten samples of fatty acids and lipids were measured, recorded, saved and baseline of the spectra’s were corrected using matlab codes and averaged. Secondly the SERS measurement was done by growing silver chloride nanoparticle on the silver substrate where the substrate was dipped in a precursor solution of silver nitrate and sodium chloride in a cyclic process. The photosensitive silver chloride crystals were reduced into silver nanoparticles using laser light from the Invia Raman spectroscopy. The SERS measurement was done by depositing the fatty acids and lipids to be measured on the spot which contains the silver nanoparticle recorded the values, saved and baseline of the spectra’s corrected using MatLab codes and averaged. This thesis work reveals that, the peaks obtained by the Raman and SERS measurement originated from the double bonds which was used to identify saturated and unsaturated fatty acids and lipids from one another. The study reveals that, the Raman measurement occurs at higher concentrations whereas the SERS measurement occurs at lower concentrations. The study reveals that the SERS measurement depends on the nature of the analyte, integration time, shape, size and laser power whereas the Raman measurement depends on the surface area and laser power. Lastly, the study reveals that the 514 nm excitation was negligible to efficiently execute the surface Plasmons of the SERS measurement.","PeriodicalId":54548,"journal":{"name":"Progress in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79263215","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}

引用次数: 1

Dual-Output Mode Analysis of Multimode Laguerre-Gaussian Beams via Deep Learning 基于深度学习的多模拉盖尔-高斯光束双输出模式分析

3区物理与天体物理

Progress in Optics Pub Date : 2021-05-24 DOI: 10.3390/OPT2020009

Xudong Yuan, Yaguang Xu, Ruizhi Zhao, Xuhao Hong, Ronger Lu, Xia Feng, Yongchuang Chen, Ji Zou, Chao Zhang, Yiqiang Qin, Yong Zhu

引用次数: 2

Lambda-type Three-Level Laser Coupled to Squeezed Vacuum Reservoir λ型三能级激光与压缩真空库耦合

3区物理与天体物理

Progress in Optics Pub Date : 2021-03-30 DOI: 10.11648/J.OPTICS.20211001.11

Takele Teshome, Gomera Biyazn, Misrak Gatahun

{"title":"Lambda-type Three-Level Laser Coupled to Squeezed Vacuum Reservoir","authors":"Takele Teshome, Gomera Biyazn, Misrak Gatahun","doi":"10.11648/J.OPTICS.20211001.11","DOIUrl":"https://doi.org/10.11648/J.OPTICS.20211001.11","url":null,"abstract":"The squeezing, entanglement, and statistical properties of light produced by lambda-type three-level laser coupled to squeezed vacuum reservoir have been studied. We have determined the quadrature variances mean as well as variance photon number photon for cavity modes with the aid of the solutions of c-number Langevin equations associated with the normal order. The results show that the light produced by the system under consideration in squeezed state. The squeezed vacuum reservoir enhances both the quadrature squeezing and mean photon numbers. In addition, the mean photon number of mode b is greater than that of a if more atoms injected with state |a>. We have calculated the quadrature variances of the cavity modes, the result shows that the light produced by the system under consideration is in squeezed state and the squeezing occurs in the minus quadrature. The result also shows that the eﬀect of the squeezed vacuum reservoir is not only enhancing the degree of squeezing for the light modes but also to generate the photons for the system under consideration. The system produce entangled two mode light that increase with η and linear gain coeﬃcient but decrease with squeezing parameters. The correlation function of the two modes decreases as η, the linear gain coeﬃcient and increase with squeezing parameter.","PeriodicalId":54548,"journal":{"name":"Progress in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89925812","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}

引用次数: 1