Pub Date : 1998-01-01DOI: 10.1364/cleo_europe.1998.cfk1
D. Anderson
Summary not available.
摘要不可用。
{"title":"Compact Photorefractive Sensors and Systems","authors":"D. Anderson","doi":"10.1364/cleo_europe.1998.cfk1","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cfk1","url":null,"abstract":"Summary not available.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81155884","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cwf45
E. Camelar, J. Muñoz, R. Nevado, P. Pernas, J. Sanz, G. Lifante, F. Cussó, F. Jaque
Among the optoelectronic devices developed based in rare-earth doped LiNbO3 crystals, the Erbium doped LiNbO3 laser has shown excellent performances [1] becoming the starting point of advanced integrated devices. A limitation in its performances arises from the relatively low absorption cross section in the laser diodes emission range, which limits the pump efficiency. One possible way of improvement, which has been succesfully implemented in other materials, consists on the use of Yb as codopant. Ytterbium not only has a high absorption cross section in the InGaAs emission range but it has also a broad absorption band that offers the possibility of excitation tunning in the 875-1000 nm wavelength region. The great overlap between ytterbium emission and erbium absorption bands allows efficient energy transfer from Yb3+ to Er3+.
{"title":"Characterisation of LiNbO3:Er/Yb Waveguides","authors":"E. Camelar, J. Muñoz, R. Nevado, P. Pernas, J. Sanz, G. Lifante, F. Cussó, F. Jaque","doi":"10.1364/cleo_europe.1998.cwf45","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf45","url":null,"abstract":"Among the optoelectronic devices developed based in rare-earth doped LiNbO3 crystals, the Erbium doped LiNbO3 laser has shown excellent performances [1] becoming the starting point of advanced integrated devices. A limitation in its performances arises from the relatively low absorption cross section in the laser diodes emission range, which limits the pump efficiency. One possible way of improvement, which has been succesfully implemented in other materials, consists on the use of Yb as codopant. Ytterbium not only has a high absorption cross section in the InGaAs emission range but it has also a broad absorption band that offers the possibility of excitation tunning in the 875-1000 nm wavelength region. The great overlap between ytterbium emission and erbium absorption bands allows efficient energy transfer from Yb3+ to Er3+.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77851164","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cwf46
V. Mikhailov, P. V. Prokoshin, K. Yumashev, N. N. Posnov, V. Kozich
Recently, laser performance of new Yb3+: KY(WO4)2 crystal (Yb3+:KYW) has been obtained at 1025 nm [1]. The Yb3+:KYW crystal is promising for the microchip and passive mode-locked lasers tuning in the range of 1020-1060 nm. It is known that Kerr-lens mode-locking technique based on the nonlinear refractive index n2 of the laser medium itself is a manner for femtosecond laser pulse generation. Such a regime on Yb3+:KYW crystal is in progress. The efficiency of Kerr-lens mode-locking depends on the n2 magnitude, and it is very important to know the n2 of laser medium for the development of Kerr-lens mode-locking. In this paper, the nonlinear refractive index of the Yb3+:KYW crystal has been measured using the Z-scan technique with a picosecond laser pulses Using a single laser beam in a tight focus geometry one measures the transmittance of a nonlinear medium through a finite aperture in the far field as a function of the sample position z measured with respect to the focal plane. The 15-ps laser pulses having an energy of 0.45 mJ are focused into the sample to the beam waist of 80 µm Figure shows a Z-scan of a 1.5 mm thick Yb3+:KY(WO4)2 crystal which has no absorption at 1.08 µm. The curve displays positive induced changes in the refractive index, and, as consequence, positive sign of n2. The index change is calculated from the phase distortion ϕ(z,r) in the sample, which is found from fitting experimental and model curves using “Gaussian decomposition” method.
{"title":"Z-scan measurements of nonlinear refraction in Yb3+: KY(WO4)2","authors":"V. Mikhailov, P. V. Prokoshin, K. Yumashev, N. N. Posnov, V. Kozich","doi":"10.1364/cleo_europe.1998.cwf46","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf46","url":null,"abstract":"Recently, laser performance of new Yb3+: KY(WO4)2 crystal (Yb3+:KYW) has been obtained at 1025 nm [1]. The Yb3+:KYW crystal is promising for the microchip and passive mode-locked lasers tuning in the range of 1020-1060 nm. It is known that Kerr-lens mode-locking technique based on the nonlinear refractive index n2 of the laser medium itself is a manner for femtosecond laser pulse generation. Such a regime on Yb3+:KYW crystal is in progress. The efficiency of Kerr-lens mode-locking depends on the n2 magnitude, and it is very important to know the n2 of laser medium for the development of Kerr-lens mode-locking. In this paper, the nonlinear refractive index of the Yb3+:KYW crystal has been measured using the Z-scan technique with a picosecond laser pulses Using a single laser beam in a tight focus geometry one measures the transmittance of a nonlinear medium through a finite aperture in the far field as a function of the sample position z measured with respect to the focal plane. The 15-ps laser pulses having an energy of 0.45 mJ are focused into the sample to the beam waist of 80 µm Figure shows a Z-scan of a 1.5 mm thick Yb3+:KY(WO4)2 crystal which has no absorption at 1.08 µm. The curve displays positive induced changes in the refractive index, and, as consequence, positive sign of n2. The index change is calculated from the phase distortion ϕ(z,r) in the sample, which is found from fitting experimental and model curves using “Gaussian decomposition” method.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72812798","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cwl3
G. Belenky, D. Donetsky, C. Reynolds, G. Shtengel, R. Kazarinov, S. Luryi
We carried out growth, fabrication, as well as characterization and modeling of InGaAsP/InP lasers with 9 QW active region and different p-doping profiles within the temperature range of 10 - 80 °C and the range of injection current densities up to 10 kA/cm2. Measurements of the threshold current, external efficiency, and optical loss were carried out for broad area and capped mesa buried heterostructure devices. We used broad area devices with electron collector on the top of p-contact for leakage measurements [1] and a modified Andrekson technique to measure optical loss. For simulation we used “Padre” program based on drift-diffusion approximation. Experiment shows that for devices with moderately doped SCH, the threshold current at room temperature reaches the value of 115 A/cm2 per QW and T0 = 64K (Fig.1).
{"title":"1.3 µm InGaAsP/InP MQW Lasers for High Temperature Operation Experiment and Modeling","authors":"G. Belenky, D. Donetsky, C. Reynolds, G. Shtengel, R. Kazarinov, S. Luryi","doi":"10.1364/cleo_europe.1998.cwl3","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwl3","url":null,"abstract":"We carried out growth, fabrication, as well as characterization and modeling of InGaAsP/InP lasers with 9 QW active region and different p-doping profiles within the temperature range of 10 - 80 °C and the range of injection current densities up to 10 kA/cm2. Measurements of the threshold current, external efficiency, and optical loss were carried out for broad area and capped mesa buried heterostructure devices. We used broad area devices with electron collector on the top of p-contact for leakage measurements [1] and a modified Andrekson technique to measure optical loss. For simulation we used “Padre” program based on drift-diffusion approximation. Experiment shows that for devices with moderately doped SCH, the threshold current at room temperature reaches the value of 115 A/cm2 per QW and T0 = 64K (Fig.1).","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79078143","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 : 1998-01-01DOI: 10.2184/lsj.27.Supplement_147
K. Takasago, F. Kannari, H. Kasuya, M. Mori, R. Goto, T. Goto, K. Yamane, Satoshi Uramatsu, T. Genji, K. Imamura, Y. Imada, A. Tsuruhara, M. Yoshida, Fumitomo Usui, H. Sawada, Y. Hirano, M. Kosaki, N. Nishizawa
There is increasing interest in utilizing optical code-division multiple-access (CDMA) schemes in fiber-optic local area networks because of its wide bandwidth, high information security, and the capability for multiple access. Both synchronous and asynchronous optical CDMA system have been actively studied. In general, the numbers of subscribers and the simultaneous users are larger in the synchronous CDMA although the system is more complex. However, a femtosecond CDMA scheme based on spectral encoding and decoding, which is categorized as an asynchronous scheme [1], can allow a large number of simultaneous users. [2] In this paper, we demonstrate the femtosecond code-division multiple-access based on spectral encoding of 1.3 μm Cr:forsterite laser.
{"title":"Femtosecond code-division multiple-access system with 1.3 μm Cr:forsterite laser","authors":"K. Takasago, F. Kannari, H. Kasuya, M. Mori, R. Goto, T. Goto, K. Yamane, Satoshi Uramatsu, T. Genji, K. Imamura, Y. Imada, A. Tsuruhara, M. Yoshida, Fumitomo Usui, H. Sawada, Y. Hirano, M. Kosaki, N. Nishizawa","doi":"10.2184/lsj.27.Supplement_147","DOIUrl":"https://doi.org/10.2184/lsj.27.Supplement_147","url":null,"abstract":"There is increasing interest in utilizing optical code-division multiple-access (CDMA) schemes in fiber-optic local area networks because of its wide bandwidth, high information security, and the capability for multiple access. Both synchronous and asynchronous optical CDMA system have been actively studied. In general, the numbers of subscribers and the simultaneous users are larger in the synchronous CDMA although the system is more complex. However, a femtosecond CDMA scheme based on spectral encoding and decoding, which is categorized as an asynchronous scheme [1], can allow a large number of simultaneous users. [2] In this paper, we demonstrate the femtosecond code-division multiple-access based on spectral encoding of 1.3 μm Cr:forsterite laser.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87378895","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.ctuk8
A. V. Shestakov
Bring results of complex studies in the field of making the new materials for solid state lasers and methods of their preparation, executed at last years in Russia by several scientific groups. Studies were conduct in following directions:- Elaboration of disordered oxide crystalline materials co-doped by rare earth ions for efficient solid state lasers working in self-modelocking regime under semiconductor diode pumping.
{"title":"Recent Developments on Solid State Laser Materials.","authors":"A. V. Shestakov","doi":"10.1364/cleo_europe.1998.ctuk8","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.ctuk8","url":null,"abstract":"Bring results of complex studies in the field of making the new materials for solid state lasers and methods of their preparation, executed at last years in Russia by several scientific groups. Studies were conduct in following directions:- Elaboration of disordered oxide crystalline materials co-doped by rare earth ions for efficient solid state lasers working in self-modelocking regime under semiconductor diode pumping.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78273181","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cmg4
J. Diettrich, I. McKinnie, D. Warrington, V. Ter-mikirtychev
Tunable, single mode, solid state lasers are required for many spectroscopic and remote sensing applications in the near infrared region. Although the important wavelength range between 1.05 and 1.3 µm is only covered by colour centre lasers, widespread use of LiF:F 2 − lasers has been limited by relatively low crystal quality, passive loss and F 2 − photodegradation processes. Narrowband LiF:F 2 − lasers have, consequently received little attention [1], operaring with low efficiency and poor long term stability. However, the recent development of crystals containing more stable F 2 − centres as well as improved crystal irradiation and annealing techniques have led to increased operating lifetime and laser efficiency [2]. (We have observed no degradation in laser performance during seven months of operation). Here we demonstrate efficient single frequency operation using a recently-developed LiF:F 2 − rod in an innovative dual cavity configuration. We anticipate that this resonator will be widely applicable to other laser media.
{"title":"Efficient, single frequency LiF:F 2 − laser","authors":"J. Diettrich, I. McKinnie, D. Warrington, V. Ter-mikirtychev","doi":"10.1364/cleo_europe.1998.cmg4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cmg4","url":null,"abstract":"Tunable, single mode, solid state lasers are required for many spectroscopic and remote sensing applications in the near infrared region. Although the important wavelength range between 1.05 and 1.3 µm is only covered by colour centre lasers, widespread use of LiF:F 2 − lasers has been limited by relatively low crystal quality, passive loss and F 2 − photodegradation processes. Narrowband LiF:F 2 − lasers have, consequently received little attention [1], operaring with low efficiency and poor long term stability. However, the recent development of crystals containing more stable F 2 − centres as well as improved crystal irradiation and annealing techniques have led to increased operating lifetime and laser efficiency [2]. (We have observed no degradation in laser performance during seven months of operation). Here we demonstrate efficient single frequency operation using a recently-developed LiF:F 2 − rod in an innovative dual cavity configuration. We anticipate that this resonator will be widely applicable to other laser media.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78411750","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cme7
H. Gnewuch, C. Pannell, G. W. Ross, P. Smith, H. Geiger
Recently, integrated-optical elements, such as lenses, prisms, and gratings, have been demonstrated by domain-inversion in thin Lithium Niobate wafers and by applying a homogeneous electric field between the planar surface electrodes, see e.g. [1]. However, to the best of our knowledge, so far only the static response of these electro-optic (EO) devices has been characterized. We report on the transient response of a light deflector based on a poled grating in LiNbO3.
{"title":"Fast transient response of light deflectors based on periodically poled LiNbO3","authors":"H. Gnewuch, C. Pannell, G. W. Ross, P. Smith, H. Geiger","doi":"10.1364/cleo_europe.1998.cme7","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cme7","url":null,"abstract":"Recently, integrated-optical elements, such as lenses, prisms, and gratings, have been demonstrated by domain-inversion in thin Lithium Niobate wafers and by applying a homogeneous electric field between the planar surface electrodes, see e.g. [1]. However, to the best of our knowledge, so far only the static response of these electro-optic (EO) devices has been characterized. We report on the transient response of a light deflector based on a poled grating in LiNbO3.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78421916","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cthh63
I. Sokolov, V. Kulikov, S. Mailis, E. Tzamali, Ch. Papademetriou, A. Ikiades, C. Kalpouzos, N. Vainos
Indium-oxide thin films present interesting electrical and optical properties and high potential for technological applications. The conductivity of indium-oxide thin films grown by dc-magnetron or laser sputtering can be modified upon illumination with ultraviolet radiation (photon energy >3.5 eV), resulting in a variable electrical state of the films from a resistive to a purely conductive one, while recently holographic recording has been demonstrated [1] aiming to information storage and processing applications.
{"title":"Non-steady-state photocurrents and holographic recording in indium-oxide (In2O3) thin films","authors":"I. Sokolov, V. Kulikov, S. Mailis, E. Tzamali, Ch. Papademetriou, A. Ikiades, C. Kalpouzos, N. Vainos","doi":"10.1364/cleo_europe.1998.cthh63","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cthh63","url":null,"abstract":"Indium-oxide thin films present interesting electrical and optical properties and high potential for technological applications. The conductivity of indium-oxide thin films grown by dc-magnetron or laser sputtering can be modified upon illumination with ultraviolet radiation (photon energy >3.5 eV), resulting in a variable electrical state of the films from a resistive to a purely conductive one, while recently holographic recording has been demonstrated [1] aiming to information storage and processing applications.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72970874","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 : 1998-01-01DOI: 10.1364/cleo_europe.1998.cthj1
U. Habich, Heike Bartels, T. Henning, P. Loosen, C. Hertzler
High-power CO2 lasers have various applications in the automotive industry, ship building, tube and pipeline welding, surface treatment and steel production. The demands on reliability, stability, uptime etc. are the same as for the standard laser devices at lower power levels.
{"title":"Development of High Beam-Quality CO2 Lasers Exceeding 20kVV and Industrial Applications","authors":"U. Habich, Heike Bartels, T. Henning, P. Loosen, C. Hertzler","doi":"10.1364/cleo_europe.1998.cthj1","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cthj1","url":null,"abstract":"High-power CO2 lasers have various applications in the automotive industry, ship building, tube and pipeline welding, surface treatment and steel production. The demands on reliability, stability, uptime etc. are the same as for the standard laser devices at lower power levels.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82006306","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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