Pub Date : 1998-01-01DOI: 10.1364/cleo_europe.1998.ctui3
A. A. Nikitichev, I. Kuchma, A. Levoshkin, A. Petrov
The crystal YAG: Yb-Ho was proposed in [1] as the prospective medium for the diode pumped laser, emitting at 2 µm. Strong and wide absorption band of Yb ions, high quantum efficiency of sensibilization at low concentration of the activator and long storage time promise significant decrease of required diode pumping power.
{"title":"Diode pumped Q-switched Y3Al5O13: Yb-Ho laser","authors":"A. A. Nikitichev, I. Kuchma, A. Levoshkin, A. Petrov","doi":"10.1364/cleo_europe.1998.ctui3","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.ctui3","url":null,"abstract":"The crystal YAG: Yb-Ho was proposed in [1] as the prospective medium for the diode pumped laser, emitting at 2 µm. Strong and wide absorption band of Yb ions, high quantum efficiency of sensibilization at low concentration of the activator and long storage time promise significant decrease of required diode pumping power.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89590917","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.ctui35
P. Chazan, M. Mikulla, S. Morgott, A. Wetzel, R. Kiefer, M. Walther, J. Braunstein, G. Weimann
The constant evolution of high power semiconductor laser sources has encouraged many groups to develop numerical methods for the calculation of the field intensity in the laser cavity. However, very few results have been reported about the comparison of experiment and simulations. In this contribution we present a 2D-model of tapered lasers and amplifiers, compare the calculations with experiment and derive some design tools for the optimization of tapered amplifiers and lasers.
{"title":"2D-Simulations of Tapered Amplifiers Comparison to Experimental Results","authors":"P. Chazan, M. Mikulla, S. Morgott, A. Wetzel, R. Kiefer, M. Walther, J. Braunstein, G. Weimann","doi":"10.1364/cleo_europe.1998.ctui35","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.ctui35","url":null,"abstract":"The constant evolution of high power semiconductor laser sources has encouraged many groups to develop numerical methods for the calculation of the field intensity in the laser cavity. However, very few results have been reported about the comparison of experiment and simulations. In this contribution we present a 2D-model of tapered lasers and amplifiers, compare the calculations with experiment and derive some design tools for the optimization of tapered amplifiers and lasers.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"111 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91487356","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.cmc7
L. E. Batay, V. P. Gribkovskii, A. A. Demidovich, A. Kaminskii, A. Kuzmin, G. I. Ryabtsev, W. Stręk
LD pumped solid state lasers are very attractive for producing of compact systems with different special lasing regimes. In this connection disordered crystals with Ca-gallogermanate structure are one of the most appropriate laser materials with broad (about 4 nm) lasing spectum [1]. Previously it was shown that Nd:La3Ga5.5Nb0.5O14 crystal like other crystals of Ca-gallogermanate group has unique combination of their physical properties [2]. In this research characteristics of LD pumped Q-switched short crystal Nd:La3Ga5.5Nb0.5O14 laser are presented.
{"title":"Q-switched microlaser with Nd:La3Ga5,5Nb0.5O14 active medium","authors":"L. E. Batay, V. P. Gribkovskii, A. A. Demidovich, A. Kaminskii, A. Kuzmin, G. I. Ryabtsev, W. Stręk","doi":"10.1364/cleo_europe.1998.cmc7","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cmc7","url":null,"abstract":"LD pumped solid state lasers are very attractive for producing of compact systems with different special lasing regimes. In this connection disordered crystals with Ca-gallogermanate structure are one of the most appropriate laser materials with broad (about 4 nm) lasing spectum [1]. Previously it was shown that Nd:La3Ga5.5Nb0.5O14 crystal like other crystals of Ca-gallogermanate group has unique combination of their physical properties [2]. In this research characteristics of LD pumped Q-switched short crystal Nd:La3Ga5.5Nb0.5O14 laser are presented.","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":"81976066","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.cthh80
M. Farsari, S. Huang, R. Young, M. I. Heywood, C. Chatwin
In order for a resin to be suitable for stereolithographic applications, it must have a high curing speed, high build resolution and low shrinkage during the liquid to solid polymerisation process. (1). We performed nondegenerate four-wave mixing on two UV curable resins, the DuPont Somos™ 6100 and the Ciba-Geigy Ciba- tool™ SL 5180. Gratings with spatial wavelength Λ=0.3 - 1.1 µm were written using an Argon ion laser operating on the λ0=351.1 nm line and for a range of irradiance 0.5-3 W/cm2. The gratings were then read using a He-Ne laser, operating at 632.8 nm. These experiments were carried out to prove the suitability of the photopoly, nerisation systems for microstereolithography.
{"title":"Holographic Measurements of Photopolymers for Microstereolithography Applications","authors":"M. Farsari, S. Huang, R. Young, M. I. Heywood, C. Chatwin","doi":"10.1364/cleo_europe.1998.cthh80","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cthh80","url":null,"abstract":"In order for a resin to be suitable for stereolithographic applications, it must have a high curing speed, high build resolution and low shrinkage during the liquid to solid polymerisation process. (1). We performed nondegenerate four-wave mixing on two UV curable resins, the DuPont Somos™ 6100 and the Ciba-Geigy Ciba- tool™ SL 5180. Gratings with spatial wavelength Λ=0.3 - 1.1 µm were written using an Argon ion laser operating on the λ0=351.1 nm line and for a range of irradiance 0.5-3 W/cm2. The gratings were then read using a He-Ne laser, operating at 632.8 nm. These experiments were carried out to prove the suitability of the photopoly, nerisation systems for microstereolithography.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82041029","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.cwf70
J.M. Tang, K. Shore
The optical switch known as the Terahertz Optical Asymmetric Demultiplexers (TOADs) is currently attracting a high degree of interest because of several key developments and new applications such as all-optical regenerative memory. However, rather little theoretical analysis of the operating characteristics of TOADs has been undertaken. Recently analysis which took into account the usual gain saturation and ultrafast intraband processes contributing to nonlinear gain compression, showed that threshold energy of TOADs can be decreased to less than 0.1pJ by matching the width of control pulse and switching window [1], and also that switching windows less than 1ps cannot be achieved in practice due to the effect of ultrafast intraband processes [2].
{"title":"Response of TOADs to Frequency Detuned Control and Signal Picosecond Pulses","authors":"J.M. Tang, K. Shore","doi":"10.1364/cleo_europe.1998.cwf70","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf70","url":null,"abstract":"The optical switch known as the Terahertz Optical Asymmetric Demultiplexers (TOADs) is currently attracting a high degree of interest because of several key developments and new applications such as all-optical regenerative memory. However, rather little theoretical analysis of the operating characteristics of TOADs has been undertaken. Recently analysis which took into account the usual gain saturation and ultrafast intraband processes contributing to nonlinear gain compression, showed that threshold energy of TOADs can be decreased to less than 0.1pJ by matching the width of control pulse and switching window [1], and also that switching windows less than 1ps cannot be achieved in practice due to the effect of ultrafast intraband processes [2].","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77595701","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.cwf86
Christoph Mettke, E. Ng, I. Watson
Automated laser welding can be improved by developing sensors that accurately record the weld characteristics and provide a feedback signal to control the laser output appropriately. A number of solutions to this problem have been developed [1,2]. An indicator or set of indicators, representing the weld quality, have to be measured during the weld process and optimised in real time so that constant quality is guaranteed. The main indicators of a good weld are its symmetry, general regularity of the weld bead and the relative spacing between the solidified pool ripples along the bead. Discontinuities such as cracks and porosity characterise a poor weld.
{"title":"Monitoring Nd:YAG and CO2 Laser Weld Quality","authors":"Christoph Mettke, E. Ng, I. Watson","doi":"10.1364/cleo_europe.1998.cwf86","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf86","url":null,"abstract":"Automated laser welding can be improved by developing sensors that accurately record the weld characteristics and provide a feedback signal to control the laser output appropriately. A number of solutions to this problem have been developed [1,2]. An indicator or set of indicators, representing the weld quality, have to be measured during the weld process and optimised in real time so that constant quality is guaranteed. The main indicators of a good weld are its symmetry, general regularity of the weld bead and the relative spacing between the solidified pool ripples along the bead. Discontinuities such as cracks and porosity characterise a poor weld.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"149 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79207561","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.cpd1.11
L. Fulop, L. Fulbert, E. Molva
We present a new concept for mass production of micro-OPO's pumped with microchip lasers. Microchip lasers are compact and simple diode-pumped solid-state lasers. They have a monolithic cavity with mirrors directly deposited on the laser material. Our concept is the association of a microchip laser without output coupler with a monolithic OPO (Fig. 1). The microchip laser and the OPO wafers are assembled using a novel process and the micro-OPO is cut using a dicing saw. In this configuration, the OPO benefits of the intracavity laser power to reach the oscillation threshold.
{"title":"Intracavity Microchip Optical Parametric Oscillator","authors":"L. Fulop, L. Fulbert, E. Molva","doi":"10.1364/cleo_europe.1998.cpd1.11","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cpd1.11","url":null,"abstract":"We present a new concept for mass production of micro-OPO's pumped with microchip lasers. Microchip lasers are compact and simple diode-pumped solid-state lasers. They have a monolithic cavity with mirrors directly deposited on the laser material. Our concept is the association of a microchip laser without output coupler with a monolithic OPO (Fig. 1). The microchip laser and the OPO wafers are assembled using a novel process and the micro-OPO is cut using a dicing saw. In this configuration, the OPO benefits of the intracavity laser power to reach the oscillation threshold.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78009642","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.cwf35
L.C. Courrol, E. P. Maldonado, L. Gomes, N. Vieira, I. Ranieri
Intense yellow and green fluorescences are usually observed during high-power diode lasers pumping at a variety of Nd laser media In the GdLiF4:Nd crystals, these anti-Stokes fluorescences resulted mainly from the excited-state absorption of pumping radiation (ESAP) or the energy-transfer up-conversion (ETU) mechanisms.
{"title":"The Up-Conversion Processes Efficiency in Diode Pumped Nd:GdLiF4","authors":"L.C. Courrol, E. P. Maldonado, L. Gomes, N. Vieira, I. Ranieri","doi":"10.1364/cleo_europe.1998.cwf35","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf35","url":null,"abstract":"Intense yellow and green fluorescences are usually observed during high-power diode lasers pumping at a variety of Nd laser media In the GdLiF4:Nd crystals, these anti-Stokes fluorescences resulted mainly from the excited-state absorption of pumping radiation (ESAP) or the energy-transfer up-conversion (ETU) mechanisms.","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":"76967633","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.cwk5
M. Danailov, A. Pecchia, M. Laurito, P. Apai
Two-wave mixing (TWM) in photorefractive crystals has been widely studied in the last decade and many potential applications have been demonstrated. As a rule, narrowband lasers with large coherence length have been utilised. To our knowledge, in the literature there is practically no data on the performance of TWM when lasers with spectral width of several nm or more are used.
{"title":"Broad Spectrum Two-Wave Mixing in BaTiO3","authors":"M. Danailov, A. Pecchia, M. Laurito, P. Apai","doi":"10.1364/cleo_europe.1998.cwk5","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwk5","url":null,"abstract":"Two-wave mixing (TWM) in photorefractive crystals has been widely studied in the last decade and many potential applications have been demonstrated. As a rule, narrowband lasers with large coherence length have been utilised. To our knowledge, in the literature there is practically no data on the performance of TWM when lasers with spectral width of several nm or more are used.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75292797","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.cwb1
Yan Sun
The design of wavelength-division-multiplexed (WDM) systems and optical networks is currently constrained by the limited bandwidth available from erbium-doped fiber amplifiers (EDFAs). The usable bandwidth is limited to be less than 20 nm because of the highly structured gain spectrum. With gain equalization filters (GEFs), this gain bandwidth can be extended to between 35 and 40 nm. It is difficult to further increase the gain bandwidth withGEFs.
{"title":"Ultra Broadband Fiber Amplifiers in 1.5~1.6μm Region","authors":"Yan Sun","doi":"10.1364/cleo_europe.1998.cwb1","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwb1","url":null,"abstract":"The design of wavelength-division-multiplexed (WDM) systems and optical networks is currently constrained by the limited bandwidth available from erbium-doped fiber amplifiers (EDFAs). The usable bandwidth is limited to be less than 20 nm because of the highly structured gain spectrum. With gain equalization filters (GEFs), this gain bandwidth can be extended to between 35 and 40 nm. It is difficult to further increase the gain bandwidth withGEFs.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75297815","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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