Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1313717
T. Schreiber, J. Limpert, S. Nolte, H. Zellmer, A. Tunnermann, R. Iliew, F. Lederer, J. Broeng, G. Vienne, A. Petersson, C. Jakobsen
In this paper, we present the results of a high power photonic crystal fiber laser, where the well-known concepts of double-clad and large-mode-area design are transfered to an actively doped microstructured fiber. The double-clad design is achieved by surrounding the inner cladding (pump core) with a web of silica bridges (as thin as 390 nm and approximately 50 /spl mu/m long) which are substantially narrower than the wavelength of the guided radiation. It is concluded that air-clad microstructure ytterbium-doped large-mode-area fibers should be scalable to kW-level output powers, where nonlinearity will limit the performance.
在本文中，我们展示了高功率光子晶体光纤激光器的结果，其中众所周知的双包层和大模面积设计概念被转移到主动掺杂微结构光纤中。双包层设计是通过将内包层(泵芯)包裹在硅桥网(薄至390纳米，长约50 /spl μ m /m)中实现的，该桥网比引导辐射的波长窄得多。结果表明，空气包层微结构掺镱大模面积光纤的输出功率应可扩展到kw级，非线性将限制其性能。
{"title":"High-power air-clad large-mode-area photonic crystal fiber laser","authors":"T. Schreiber, J. Limpert, S. Nolte, H. Zellmer, A. Tunnermann, R. Iliew, F. Lederer, J. Broeng, G. Vienne, A. Petersson, C. Jakobsen","doi":"10.1109/CLEOE.2003.1313717","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313717","url":null,"abstract":"In this paper, we present the results of a high power photonic crystal fiber laser, where the well-known concepts of double-clad and large-mode-area design are transfered to an actively doped microstructured fiber. The double-clad design is achieved by surrounding the inner cladding (pump core) with a web of silica bridges (as thin as 390 nm and approximately 50 /spl mu/m long) which are substantially narrower than the wavelength of the guided radiation. It is concluded that air-clad microstructure ytterbium-doped large-mode-area fibers should be scalable to kW-level output powers, where nonlinearity will limit the performance.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"21 22","pages":"656-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72603977","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1312384
A. Kornev, I. Kuchma, V. Pokrovskiy, L. Soms, V. K. Stupnikov
The present paper describes an alternative approach to the image forming, which is in a spatial modulation of the gain in the active medium, by the spatial modulation of the density of pump. The problems for the super-Rayleigh resolution are discussed and a possibility of gray scale image generation was shown. The fragmentation of the cross section of the Fabry-Perot cavity helps to suppress smoothening of the image edges during large objects generation. A numerical model of pump modulated lasing pixels (PMLP) was developed, the results of calculation being in good agreement with experiments.
{"title":"Pump modulated lasing pixels: a new approach for image generation","authors":"A. Kornev, I. Kuchma, V. Pokrovskiy, L. Soms, V. K. Stupnikov","doi":"10.1109/CLEOE.2003.1312384","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1312384","url":null,"abstract":"The present paper describes an alternative approach to the image forming, which is in a spatial modulation of the gain in the active medium, by the spatial modulation of the density of pump. The problems for the super-Rayleigh resolution are discussed and a possibility of gray scale image generation was shown. The fragmentation of the cross section of the Fabry-Perot cavity helps to suppress smoothening of the image edges during large objects generation. A numerical model of pump modulated lasing pixels (PMLP) was developed, the results of calculation being in good agreement with experiments.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"30 1","pages":"323-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78244835","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1313809
D. Cheung, A. Somervell, T. H. Barnes, T. Haskell
The idea of feedback interferometry for aberration correction was proposed by the author. Conventional adaptive optics (AO) systems usually use separate subsystems to perform wavefront sensing and correction, which involve large matrix manipulation. In a feedback interferometer, the intensity of the interference pattern is used to control the wavefront corrector, thus combining the two subsystems together. To develop a practical system for use in real turbulent environments, there are several issues that need to be considered. There are concerns in the control algorithm as well when try to use the system in practice. Scintillation and frequency response are the major issues. The frequency response determines how fast the aberration that the system can track and correct. Atmospheric induced aberration might have frequency components as high as 200 Hz.
{"title":"Practical issues of feedback interferometry for adaptive optics","authors":"D. Cheung, A. Somervell, T. H. Barnes, T. Haskell","doi":"10.1109/CLEOE.2003.1313809","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313809","url":null,"abstract":"The idea of feedback interferometry for aberration correction was proposed by the author. Conventional adaptive optics (AO) systems usually use separate subsystems to perform wavefront sensing and correction, which involve large matrix manipulation. In a feedback interferometer, the intensity of the interference pattern is used to control the wavefront corrector, thus combining the two subsystems together. To develop a practical system for use in real turbulent environments, there are several issues that need to be considered. There are concerns in the control algorithm as well when try to use the system in practice. Scintillation and frequency response are the major issues. The frequency response determines how fast the aberration that the system can track and correct. Atmospheric induced aberration might have frequency components as high as 200 Hz.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"12 1","pages":"734-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75084292","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1312142
E. Rugi, P. Mueller, P. Lambelet
The Contraves Space development activities for Optical Inter-satellite Link Communications have developed a scalable high brightness laser diode based pump. The optical design of using multidiode lasers allows flexibility with regard to the optical power and the pump wavelength while increasing the reliability figures of a single diode laser. The active alignment during integration guarantees an optical coupling efficiency higher than 60%. Material selection and thermo-mechanical design have been carried out to withstand the harsh environmental conditions typical of the launch phase and of the in orbit operation. Optimisation of mass and volume led to a compact and easy to accommodate solution. The functional and opto-mechanical performance has been validated by test.
{"title":"Scalable high brightness laser pump for aerospace applications","authors":"E. Rugi, P. Mueller, P. Lambelet","doi":"10.1109/CLEOE.2003.1312142","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1312142","url":null,"abstract":"The Contraves Space development activities for Optical Inter-satellite Link Communications have developed a scalable high brightness laser diode based pump. The optical design of using multidiode lasers allows flexibility with regard to the optical power and the pump wavelength while increasing the reliability figures of a single diode laser. The active alignment during integration guarantees an optical coupling efficiency higher than 60%. Material selection and thermo-mechanical design have been carried out to withstand the harsh environmental conditions typical of the launch phase and of the in orbit operation. Optimisation of mass and volume led to a compact and easy to accommodate solution. The functional and opto-mechanical performance has been validated by test.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"47 1","pages":"81-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74992857","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1313700
A. Chardon, D. Shepherd, P. Camy, J. Doualan, E. Daran, G. Lacoste
In this paper, the gain measurements and lasing action at 2.8 /spl mu/m and fluorescence spectroscopy in Er:LaF/sub 3/ planar waveguides fabricated by molecular beam epitaxy was demonstrated. The spectroscopic analysis shows that fluorescence lifetimes calculated by a Judd-Ofelt model based on the measured absorption spectra were in good agreement with measured fluorescence lifetimes.
{"title":"Gain measurements at 2.8 /spl mu/m and fluorescence spectroscopy in Er:LaF/sub 3/ waveguides fabricated by molecular beam epitaxy","authors":"A. Chardon, D. Shepherd, P. Camy, J. Doualan, E. Daran, G. Lacoste","doi":"10.1109/CLEOE.2003.1313700","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313700","url":null,"abstract":"In this paper, the gain measurements and lasing action at 2.8 /spl mu/m and fluorescence spectroscopy in Er:LaF/sub 3/ planar waveguides fabricated by molecular beam epitaxy was demonstrated. The spectroscopic analysis shows that fluorescence lifetimes calculated by a Judd-Ofelt model based on the measured absorption spectra were in good agreement with measured fluorescence lifetimes.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"56 1","pages":"639-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74997333","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1312159
P. Straka, H. Turčičova, J. Skála, B. Králiková, J. Dostál, K. Rohlena, J. Ullschmied, K. Jungwirth
In this paper we build a new smaller iodine laser SOFIA and we also aim to develop the optical parametric chirped pulse amplification (OPCPA) method in laboratory of solid-state oscillator followed by iodine amplifiers and prepare its fast implementation at PALS(Prague Asterix Laser System).
{"title":"High power hybrid laser SOFIA with a solid state oscillator and gaseous amplifiers","authors":"P. Straka, H. Turčičova, J. Skála, B. Králiková, J. Dostál, K. Rohlena, J. Ullschmied, K. Jungwirth","doi":"10.1109/CLEOE.2003.1312159","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1312159","url":null,"abstract":"In this paper we build a new smaller iodine laser SOFIA and we also aim to develop the optical parametric chirped pulse amplification (OPCPA) method in laboratory of solid-state oscillator followed by iodine amplifiers and prepare its fast implementation at PALS(Prague Asterix Laser System).","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"48 1","pages":"98-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77581929","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1313588
A. Waddie, K. Symington, J. Snowdon, M. Taghizadeh
In this paper we outline some of the changes needed to implement multilayer feed-forward neural networks using the demonstrator hardware which was based on around an array of vertical cavity surface emitting lasers. Network simulations show that the neural network demonstrator hardware can be used to implement two different classes of feed-forward network, the multilayer perceptron (MLP) and radial basis function (RBF) networks. In both cases, the actual training of the networks is performed offline using hardware simulations and the weighted interconnections between neurons are fixed before application to the optoelectronic hardware.
{"title":"Optoelectronic neural networks: mapping multilayer architectures on to an optoelectronic demonstrator","authors":"A. Waddie, K. Symington, J. Snowdon, M. Taghizadeh","doi":"10.1109/CLEOE.2003.1313588","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313588","url":null,"abstract":"In this paper we outline some of the changes needed to implement multilayer feed-forward neural networks using the demonstrator hardware which was based on around an array of vertical cavity surface emitting lasers. Network simulations show that the neural network demonstrator hardware can be used to implement two different classes of feed-forward network, the multilayer perceptron (MLP) and radial basis function (RBF) networks. In both cases, the actual training of the networks is performed offline using hardware simulations and the weighted interconnections between neurons are fixed before application to the optoelectronic hardware.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"110 1","pages":"526-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77699871","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1312352
L. Ivleva, N. Polozkov, P. Lykov, V. Osiko, T. Volk
This paper investigated the modification of ferroelectric, photorefractive and photochromic properties of SBN crystals by means of introduction of the transition metals into the matrix. The two- and four-wave interaction in the crystals doped with Co;Cr;Ni was studied to determine the efficiency of their application in the storage of optical information and in phase conjugation of laser radiation. It was established that, of SBN crystals doped with Co;Cr;Ni, SBN:Co only is characterized by a strong dichroism in linear and photoinduced absorption. The steady-state and dynamic behavior of absorption gratings in nonpoled SBN:Co was studied.
{"title":"Growth and physical properties of photorefractive SBN single crystals, doped with Co, Cr, Ni","authors":"L. Ivleva, N. Polozkov, P. Lykov, V. Osiko, T. Volk","doi":"10.1109/CLEOE.2003.1312352","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1312352","url":null,"abstract":"This paper investigated the modification of ferroelectric, photorefractive and photochromic properties of SBN crystals by means of introduction of the transition metals into the matrix. The two- and four-wave interaction in the crystals doped with Co;Cr;Ni was studied to determine the efficiency of their application in the storage of optical information and in phase conjugation of laser radiation. It was established that, of SBN crystals doped with Co;Cr;Ni, SBN:Co only is characterized by a strong dichroism in linear and photoinduced absorption. The steady-state and dynamic behavior of absorption gratings in nonpoled SBN:Co was studied.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"65 1","pages":"291-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80272569","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1313684
Jayanta K. Sahu, C. Codemard, R. Selvas, J. Nilsson, Mathieu Laroche, W. Clarkson
We report the continuous-wave operation of a thulium-doped silica fibre laser, pumped at 1567 nm from an erbium/ytterbium-doped fibre laser. The quantum efficiency of 51% (with respect to absorbed pump power) is obtained at a wavelength of 1830 nm. The laser can be tuned continuously from 1750 to 1880 nm using an external grating.
{"title":"Tunable Tm-doped silica fibre laser","authors":"Jayanta K. Sahu, C. Codemard, R. Selvas, J. Nilsson, Mathieu Laroche, W. Clarkson","doi":"10.1109/CLEOE.2003.1313684","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313684","url":null,"abstract":"We report the continuous-wave operation of a thulium-doped silica fibre laser, pumped at 1567 nm from an erbium/ytterbium-doped fibre laser. The quantum efficiency of 51% (with respect to absorbed pump power) is obtained at a wavelength of 1830 nm. The laser can be tuned continuously from 1750 to 1880 nm using an external grating.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"1 1","pages":"621-622"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79239878","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}
Pub Date : 2003-06-22DOI: 10.1109/CLEOE.2003.1313631
W. Schulz, J. Michel, S. Pfeiffer, M. Niessen, V. Kostrykin
Summary form only given. Laser cutting is an established separation process. Reliable machining at high productivity and quality as well as simplified machine operation are the actual goals. Monitoring and control of the dynamical process is investigated. This work describes the advances in fundamental physical modeling of time dependent processes such as piercing and contour cutting. Singular perturbation and spectral methods are applied to reveal the number and type of characteristic dynamical variables. Refinement of the dynamical model is performed in order to identify the relations between phase space dimension of the model, properties of the monitoring signals and the quality features of the process. As result the dynamical properties of the process are mapped to different domains of the processing parameters.
{"title":"Identification of process domains in cutting","authors":"W. Schulz, J. Michel, S. Pfeiffer, M. Niessen, V. Kostrykin","doi":"10.1109/CLEOE.2003.1313631","DOIUrl":"https://doi.org/10.1109/CLEOE.2003.1313631","url":null,"abstract":"Summary form only given. Laser cutting is an established separation process. Reliable machining at high productivity and quality as well as simplified machine operation are the actual goals. Monitoring and control of the dynamical process is investigated. This work describes the advances in fundamental physical modeling of time dependent processes such as piercing and contour cutting. Singular perturbation and spectral methods are applied to reveal the number and type of characteristic dynamical variables. Refinement of the dynamical model is performed in order to identify the relations between phase space dimension of the model, properties of the monitoring signals and the quality features of the process. As result the dynamical properties of the process are mapped to different domains of the processing parameters.","PeriodicalId":6370,"journal":{"name":"2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)","volume":"41 1","pages":"569-"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81496104","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}
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