Journal of lasers, optics & photonics最新文献_第4页

Generation of Arbitrary Waveform Based on Optical Frequency Comb Using a Dual Parallel Mach-Zehnder Modulator and an Optical Filter 利用双平行马赫-曾德调制器和光滤波器实现基于光频梳的任意波形的产生

Journal of lasers, optics & photonics Pub Date : 2018-01-01 DOI: 10.4172/2469-410X.1000180

N. Liu, S. Wu

引用次数: 0

Inter-Relation between Laser Induced Photoconductance and Millimeter Wave Absorption Using C-Si Intrinsic Resistivity 利用C-Si本征电阻率研究激光诱导光导与毫米波吸收的关系

Journal of lasers, optics & photonics Pub Date : 2018-01-01 DOI: 10.4172/2469-410X.1000175

B. Roy, A. Tsui, O. Oni, B. Vlahovic

{"title":"Inter-Relation between Laser Induced Photoconductance and Millimeter Wave Absorption Using C-Si Intrinsic Resistivity","authors":"B. Roy, A. Tsui, O. Oni, B. Vlahovic","doi":"10.4172/2469-410X.1000175","DOIUrl":"https://doi.org/10.4172/2469-410X.1000175","url":null,"abstract":"In a contactless photo conductance measurement system the radio-frequency (RF) probe transmission (ΔV/ V0) should be proportional to the product of laser-induced carrier concentration and carrier mobility (IΣμ) through a sensitivity factor (A). We use 532 nm laser (pump)-millimeter wave (mmw-probe) system whose concentrations (I) are calculated by considering single-surface reflection of the laser beam and mobility (Σμ) derived from a model. In order to ascertain A we use five c-Si (100) samples having resistivity in the range 15-130 Ω-cm. For relating (ΔV/V0) with IΣμ to find A, we take their ratio and quantify A once using a quadratic-fit functional form of the ratio of sample resistivity to air resistivity (ρ/ρ0), and another time using product of free-space impedance and sample thickness (ρ/Z0t). A is ascertained for (ΔV/V0)-laser fluence linear region while fluence is in range 0-1.7 μJ/cm2 and probe frequency is fixed at 140 GHz. Value of A is further fine-tuned by multiplying with 0.85 (to linearize the ratio with the non-dimensional function) and finally obtain sensitivity A=0.291. Standard error in mmw photo conductance (obtained using calculated A) between the two approaches diminish with laser attenuation roughly at a rate ± 0.53 × 10-5 S, per decimal neutral density filter size.","PeriodicalId":92245,"journal":{"name":"Journal of lasers, optics & photonics","volume":"8 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88452326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stimulated Brillouin Scattering in High-Power Photonic Crystal Fiber Lasers in Different Pump Schemes 不同泵浦方案下高功率光子晶体光纤激光器中的受激布里渊散射

Journal of lasers, optics & photonics Pub Date : 2017-12-20 DOI: 10.4172/2469-410X.1000170

M. Abouricha, A. Boulezhar, S. Amrane, N. Azami

引用次数: 1

Theory of unified matter 统一物质理论

Journal of lasers, optics & photonics Pub Date : 2017-11-10 DOI: 10.4172/2469-410X-C1-015

S. Budnik

{"title":"Theory of unified matter","authors":"S. Budnik","doi":"10.4172/2469-410X-C1-015","DOIUrl":"https://doi.org/10.4172/2469-410X-C1-015","url":null,"abstract":"U (UV) photonic devices such as laser diodes (LDs) and light-emitting diodes (LEDs) have drawn great interest in many applications including lighting, optical storage, and purification. From a theoretical viewpoint, III-nitride (III-N) semiconductors can be good candidates for UV photonic application because of its band gap which may cover a wide wavelength range of ultraviolet (UV) to visible red. The (Al,Ga,In)N multiple quantum wells (MQWs) are extensively used as active region for deep UV wavelengths. These structures are characterized by the existence of both spontaneous and piezoelectric polarization arising from the lack of lattice-matched substrate. The polarization-induced internal electric field causes charge separation which leads to reduction in TE-polarized spontaneous emission radiative recombination rate (Rsp) and TE-polarized optical gain (GTE). One of the challenges for high efficiency UV lasers is the need to reduce this internal electric field. We present here a comprehensive analysis of structure based on III-N quaternary QWs as an alternative for high efficiency deep-UV lasers using the 8x8 wurtzite k.p Hamiltonian matrix to calculate the energies band structures and the wave functions by taking into account the valence band anisotropy mixing, the interband interaction and the spontaneous and piezoelectric polarization. Simulation of lasers performance are realized using matlab genetic algorithm. Our proposed design is optimized by adjusting the (Al,In) content and thickness of the sublayers of staggered AluInvGa1-u-vN/AlxInyGa1-x-yNdelta-AlxGa1-xN QWs surrounded by quaternary AlInGaN for peak emission wavelengths at 229 nm. since TE-polarized optical gain peak intensity larger than such achieved by conventional AlInN-delta-GaN-based QWs.","PeriodicalId":92245,"journal":{"name":"Journal of lasers, optics & photonics","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77891112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experiments directly demonstrating that the speed of light is independent of the velocity of the source: An experimental fact or a misconception 直接证明光速与光源速度无关的实验:实验事实或误解

Journal of lasers, optics & photonics Pub Date : 2017-09-30 DOI: 10.4172/2469-410X.1000164

Apollonov Vv

引用次数: 2

Free Space Optical Communication: The Last Mile Solution to High Speed Communication Networks 自由空间光通信:高速通信网络的最后一英里解决方案

Journal of lasers, optics & photonics Pub Date : 2017-09-01 DOI: 10.4172/2469-410X.1000E112

R. Miglani

引用次数: 4

“Smart Dust” & Internet of Things (IoT): Progress & Challenges “智能粉尘”与物联网(IoT):进展与挑战

Journal of lasers, optics & photonics Pub Date : 2017-06-30 DOI: 10.4172/2469-410X.1000160

D. Sadana, Ning Li, S. Bedell, Ghavam S Shahidi

{"title":"“Smart Dust” & Internet of Things (IoT): Progress & Challenges","authors":"D. Sadana, Ning Li, S. Bedell, Ghavam S Shahidi","doi":"10.4172/2469-410X.1000160","DOIUrl":"https://doi.org/10.4172/2469-410X.1000160","url":null,"abstract":"Copyright: © 2017 Sadana DK, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The breath taking progress in CMOS scaling over last five decades has made it possible to shrink complex digital integrated circuits (ICs), such as a microprocessor into dimensions that are approaching a dust particle (<1 mm). For example, the latest 10 nm CMOS product is expected to have ~ 100 million transistors/mm2 (1). This makes fabrication of highly advanced smart dust equipped with a low-power (μW) micro-processor a reality and at a cost of less than a dime! Such unimaginable cost reduction is achievable because a 300 mm Si wafer can easily accommodate over 100,000 advanced ICs on a foot print of <0.8 mm × 0. 8 mm. This allows the recent emergence of Internet of Things (IoT) to be expanded using the “smart dust”. Continued proliferation of IoT is expected to exploit advances in smart dust and low-power wireless communication technologies in conjunction with progress in data security. The impact of IoT in monitoring and controlling various environments, such as agricultural fields, medical, healthcare, manufacturing plants, transportation systems and sending continuous streams of accurate and real-time data can be truly transformational (Figures 1 and 2).","PeriodicalId":92245,"journal":{"name":"Journal of lasers, optics & photonics","volume":"10 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77593184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Strongly Optical Absorbing Nanostructures Containing Metal QuantumDots: Theory 含金属量子点的强光吸收纳米结构:理论

Journal of lasers, optics & photonics Pub Date : 2017-06-30 DOI: 10.4172/2469-410X.1000156

S. Pokutnyi

引用次数: 1

Optothermodynamic Method of Diagnosis of Absorption Coefficient in theLiquids 液体吸收系数诊断的光热力学方法

Journal of lasers, optics & photonics Pub Date : 2017-06-30 DOI: 10.4172/2469-410X.1000162

Musayev Ma, Hesenov Qt, Hashimova Nn, Ceferova An

引用次数: 0

Method of Elimination of the Residual Lumination of the LuminescentCovering of Screen 一种消除屏幕荧光屏残光的方法

Journal of lasers, optics & photonics Pub Date : 2017-06-30 DOI: 10.4172/2469-410X.1000159

B. Marina, B. Narkiza, K. Borodina, S. Sorokina

引用次数: 0