Pub Date : 1998-01-01DOI: 10.1364/cleo_europe.1998.cfi4
R. Jenkins, R. Devereux, A. F. Blockley
The paper describes a novel integrated optics approach to coherent 10.6μm LIDAR systems. The concept is based on using hollow waveguides to guide light between components located in a common dielectric substrate. The concept, referred to as Hollow Waveguide Integrated Optics (HOW-IO), has advantages in relation to achieving and maintaining good coherent mixing efficiencies and has the potential to: reduce size, increase ruggedness and lower manufacturing costs. The figure shows a plan view photograph of a HOW-IO interferometer subsystem which we have realised in practice. The integrated components and interconnecting waveguides are clearly visible. The subsystem was formed in a 180×190×20mm polycrystalline alumina substrate using a computer controlled milling machine. Polycrystalline alumina was chosen as the substrate and lid material because its optical properties, in conjunction with waveguides of appropriate cross section, allow the realisation of low attenuation coefficients at 10.6μm.
{"title":"An Integrated Optic Approach to 10μm LIDAR","authors":"R. Jenkins, R. Devereux, A. F. Blockley","doi":"10.1364/cleo_europe.1998.cfi4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cfi4","url":null,"abstract":"The paper describes a novel integrated optics approach to coherent 10.6μm LIDAR systems. The concept is based on using hollow waveguides to guide light between components located in a common dielectric substrate. The concept, referred to as Hollow Waveguide Integrated Optics (HOW-IO), has advantages in relation to achieving and maintaining good coherent mixing efficiencies and has the potential to: reduce size, increase ruggedness and lower manufacturing costs. The figure shows a plan view photograph of a HOW-IO interferometer subsystem which we have realised in practice. The integrated components and interconnecting waveguides are clearly visible. The subsystem was formed in a 180×190×20mm polycrystalline alumina substrate using a computer controlled milling machine. Polycrystalline alumina was chosen as the substrate and lid material because its optical properties, in conjunction with waveguides of appropriate cross section, allow the realisation of low attenuation coefficients at 10.6μm.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"135 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81445905","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.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.cma4
A. Poppe, L. Xu, A. Fürbach, M. Lenzner, F. Krausz, C. Spielmann
Femtosecond light pulses are important tools for time-resolved spectroscopy and nonlinear optics owing to their ultrashort duration and high peak power, respectively. However, intensities in excess of 1012 W/cm2 have not been demonstrated with these systems, limiting their utility for nonlinear optics. In this contribution we demonstrate that recent innovations in sub-10fs laser technology now allow generating i) sub-10fs optical pulses with a peak power of 1.5 MW and ii) intensities greater than 5 × 1013 W/cm2, a never- before-accessed range at repetition rates of a≈ 100 MHz. This performance is achieved with a compact all-solid-state system and opens up the way towards the investigation and possible exploitation of nonperturbative nonlinear optical processes at repetition rates of around 100 MHz for the first time.
{"title":"A 7-fs Ti:sapphire laser focusable to 5 × 1013 W/cm2","authors":"A. Poppe, L. Xu, A. Fürbach, M. Lenzner, F. Krausz, C. Spielmann","doi":"10.1364/cleo_europe.1998.cma4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cma4","url":null,"abstract":"Femtosecond light pulses are important tools for time-resolved spectroscopy and nonlinear optics owing to their ultrashort duration and high peak power, respectively. However, intensities in excess of 1012 W/cm2 have not been demonstrated with these systems, limiting their utility for nonlinear optics. In this contribution we demonstrate that recent innovations in sub-10fs laser technology now allow generating i) sub-10fs optical pulses with a peak power of 1.5 MW and ii) intensities greater than 5 × 1013 W/cm2, a never- before-accessed range at repetition rates of a≈ 100 MHz. This performance is achieved with a compact all-solid-state system and opens up the way towards the investigation and possible exploitation of nonperturbative nonlinear optical processes at repetition rates of around 100 MHz for the first time.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85280235","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.cfc6
A. Lapucci, M. Ciofini, S. Mascalchi
The annular geometry represents an interesting alternative to the slab format for diffusion cooled RF excited CO2 lasers. Typical draw backs of this scheme are related to the difficulties encountered in extracting a good quality beam [1] and in uniformly distributing the power in the discharge. Some effective solutions to the latter problem have recently been found [2,3], We have focused our attention to the former problem, experimentally testing the use of a Talbot cavity together with a phase-correcting mirror on the 100 W class annular laser described in Ref.[1]. The extraction efficiency obtained so far with this scheme is half that of a simple plane-plane guided resonator producing a multimode beam. The beam quality on the other hand appears sensibly enhanced.
{"title":"Mode behaviour of a waveguide annular CO2 laser with a Talbot cavity","authors":"A. Lapucci, M. Ciofini, S. Mascalchi","doi":"10.1364/cleo_europe.1998.cfc6","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cfc6","url":null,"abstract":"The annular geometry represents an interesting alternative to the slab format for diffusion cooled RF excited CO2 lasers. Typical draw backs of this scheme are related to the difficulties encountered in extracting a good quality beam [1] and in uniformly distributing the power in the discharge. Some effective solutions to the latter problem have recently been found [2,3], We have focused our attention to the former problem, experimentally testing the use of a Talbot cavity together with a phase-correcting mirror on the 100 W class annular laser described in Ref.[1]. The extraction efficiency obtained so far with this scheme is half that of a simple plane-plane guided resonator producing a multimode beam. The beam quality on the other hand appears sensibly enhanced.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"133 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83520606","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.cpd1.4
F. Futami, K. Kikuchi
Recently, we have succeeded in generating the very flat super-continuum (SC) spectrum wider than 200 nm centered at 1550 nm by using a dispersion-flattened fiber having a small normal group-velocity dispersion (GVD) [1]. Since such SC pulse has linear up-chirp across the entire pulse width, we may compress the pulse width to its Fourier-transform-limited (TL) value by using an appropriate amount of anomalous GVD.
{"title":"Generation of 200-fs Fourier-Transform-Limited Optical Pulses at 1550 nm from Super-Continuum Obtained by a Mode-Locked Semiconductor Laser","authors":"F. Futami, K. Kikuchi","doi":"10.1364/cleo_europe.1998.cpd1.4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cpd1.4","url":null,"abstract":"Recently, we have succeeded in generating the very flat super-continuum (SC) spectrum wider than 200 nm centered at 1550 nm by using a dispersion-flattened fiber having a small normal group-velocity dispersion (GVD) [1]. Since such SC pulse has linear up-chirp across the entire pulse width, we may compress the pulse width to its Fourier-transform-limited (TL) value by using an appropriate amount of anomalous GVD.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85628346","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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