1994 Conference on Lasers and Electro-Optics Europe最新文献_第10页

Recent advances in different optics 不同光学的最新进展

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cmn1

K. Knop

引用次数: 0

Single-frequency operation of the diode-pumped partially inhomogeneously broadened Nd3+:GdVO4 laser 二极管泵浦部分非均匀展宽Nd3+:GdVO4激光器的单频工作

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctua5

E. Sorokin, I. Sorokina, E. Wintner

引用次数: 0

Flexible workstation for laser surface treatment 灵活的激光表面处理工作站

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctha1

M. Cantello

引用次数: 0

Present status of mode-locked solid-state lasers 锁模固体激光器的研究现状

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cme1

W. Sibbett

引用次数: 0

1.5 μm Room-temperature luminescence from erbium in oxygen-doped silicon grown by molecular beam epitaxy 分子束外延生长的掺氧硅中铒的1.5 μm室温发光

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cthp4

R. Serna, M. Lohmeier, E. Vlieg, A. Polman

引用次数: 0

Observation of misalignment of the subharmonic grating in photorefractive Bi12SiO20 光折变Bi12SiO20中亚谐波光栅畸变的观察

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctuh5

H. Pedersen, P. Johansen

引用次数: 0

Room temperature continuous wave Er,Yb:Y3Al5O12 laser at 1.6 μm with Yb-Er pump energy transfer 室温连续波Er,Yb:Y3Al5O12激光波长1.6 μm，以Yb-Er泵浦能量传递

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cfc3

T. Schweizer, E. Heumann, F. Heine, G. Huber

{"title":"Room temperature continuous wave Er,Yb:Y3Al5O12 laser at 1.6 μm with Yb-Er pump energy transfer","authors":"T. Schweizer, E. Heumann, F. Heine, G. Huber","doi":"10.1364/cleo_europe.1994.cfc3","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cfc3","url":null,"abstract":"Er3+ lasers emitting at 1.6 μm are useful for communication and eye-safe atmospheric measurement techniques like LIDAR. In contrast to glass, the garnet crystal YAG (Y3A15O12) as a host for rare earth ions provides good thermal conductivity. The crystals used in this paper were grown in our institute by the Czochralski method. Duczynski et al.,1 reported Er: YAG laser emission at 1.6 μm pumping with a krypton-ion laser at 647 nm with a maximum slope efficiency of 12.7%. Spariosu and Birnbaum2 achieved an Er: YAG laser by exciting the upper laser level at 1.535 μm with an Er:glass laser and obtained slope efficiencies as high as 50%. Due to the weak absorption of the 4I11/2-level of Er around 965 nm (α = 0.34 cm-1 in Er(0.5%):YAG), we investigated the co-doping with Yb to enhance the pump energy absorption (see Fig. 2). Such a pumping scheme has been used in Er glasses and is particularly interesting because high power InGaAs diode lasers emitting around 970 nm are available. Figure 1 shows the relevant energy levels of Er and Yb together with the pumping mechanism and the laser transition. We used the resonant energy transfer between the 2F5/2-level of Yb and the 4In/2-level of Er by pumping into the Yb-level. The 4I11/2-level is depopulated by phonon relaxations and 2.7 μm fluorescence into the 4I13/2-level, which is the upper laser level with a lifetime of 6.5 ms in Er(0.5%):YAG. The Fluorescence spectrum of Er,Yb:YAG shows a strong fluorescence of Yb around 1 μm indicating energy back transfer from Er to Yb, when the Er-ions are excited by the 488-nm line of an argon-ion laser (see (Fig. 2). The back transfer is pronouced due to the relatively long 4I11/2 lifetime in Er:YAG.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132804017","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

Porous silicon 多孔硅

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cwk2

L. Canham

引用次数: 0

Study of air flow in hollow bricks using holographic interferometry 用全息干涉法研究空心砖内部的气流

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.ctud2

C. Vennin, J. Watson, M. Imbabi

{"title":"Study of air flow in hollow bricks using holographic interferometry","authors":"C. Vennin, J. Watson, M. Imbabi","doi":"10.1364/cleo_europe.1994.ctud2","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctud2","url":null,"abstract":"Natural convection is a topic of considerable interest in many engineering applications. To improve the thermal insulation of walls, hollow bricks in which this kind of convection occurs could be used. Thus a good understanding of the free convection of the air inside this type of bricks is valuable. Theoretical studies consisting of computer simulation have already been carried out and give a good understanding of the flow movement, velocity, and temperature variation in different types of fluids.1-2 The aim of our study was to perfect a good holographic interferometric method to visualise the isothermal lines of a free air flow convection inside a hollow brick. By viewing and understanding the heat transfer inside, it will be possible to define a cavity shape that reduces heat exchange between the cold outdoor and the hot indoor surface (and vice versa). The hollow brick cavity dimensions were 180 × 60 × 60 mm, two walls were in aluminium, two in Tuffnal and the two windows were in a Plexiglas. Temperature differences, ΔT, of 7 to 30°C were obtained with the heater on the vertical side. The temperature was measured with four thermocouples inside the two aluminium walls.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129241525","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

Comparison of analytical methods and simulation of optically preamplified receivers 光学预放大接收机的分析方法与仿真比较

1994 Conference on Lasers and Electro-Optics Europe Pub Date : 1900-01-01 DOI: 10.1364/cleo_europe.1994.cthi6

L. Ribeiro, J. D. da Rocha, R. Ribeiro

引用次数: 0