Pub Date : 1998-01-01DOI: 10.1364/cleo_europe.1998.cwf29
S. Guy, Y. Guyot, M. Joubert
The search for tunable blue-UV solid-state lasers has led to the recognition that 4fn-1 5d to 4P transitions of rare earth ions can potentially be useful for these types of laser systems. Such laser actions has been observed with Ce3+ or Nd3+-doped fluoride crystals. Nevertheless, these lasers suffer from solarization mechanisms which has been found to involve two-photon creation of color centers (via the 4fn →4fn-15d → conduction band pathway). One way to overpass this problem is a stepwise multiphoton excitation of 4fn-15d states with photons of low energy.
{"title":"Inter Configuration Excited-State Absorption of Nd3+-Doped Fluoride Crystals","authors":"S. Guy, Y. Guyot, M. Joubert","doi":"10.1364/cleo_europe.1998.cwf29","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf29","url":null,"abstract":"The search for tunable blue-UV solid-state lasers has led to the recognition that 4fn-1 5d to 4P transitions of rare earth ions can potentially be useful for these types of laser systems. Such laser actions has been observed with Ce3+ or Nd3+-doped fluoride crystals. Nevertheless, these lasers suffer from solarization mechanisms which has been found to involve two-photon creation of color centers (via the 4fn →4fn-15d → conduction band pathway). One way to overpass this problem is a stepwise multiphoton excitation of 4fn-15d states with photons of low energy.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73221992","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.cmg7
M. Deneva, M. Nenchev, R. Barbé, J. Keller
Passive self-injection locking (PSIL) laser spectral control yields efficiency close to that in the optimized non-selective cavity and avoids the optical damage of the selectors [1,2]. Its principle lies in the spectrally selective re-injection in the cavity of a part of the output beam. We show (theory, experiment) that such control entails as addition the principle of novel technique for producing in a purely optical and simple manner high power unidirectional ring laser generation which is spectrally fixed at a chosen reference atomic absorption line. Such lasers are of interest as wavelength standards, in laser isotope separation and in DIAL lidars.
{"title":"Unidirectional Ring TI3+:AL2O3 Laser Operation at the Wavelength of an Atomic Absorption Line Using Bi-Directional Passive Self-Injection","authors":"M. Deneva, M. Nenchev, R. Barbé, J. Keller","doi":"10.1364/cleo_europe.1998.cmg7","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cmg7","url":null,"abstract":"Passive self-injection locking (PSIL) laser spectral control yields efficiency close to that in the optimized non-selective cavity and avoids the optical damage of the selectors [1,2]. Its principle lies in the spectrally selective re-injection in the cavity of a part of the output beam. We show (theory, experiment) that such control entails as addition the principle of novel technique for producing in a purely optical and simple manner high power unidirectional ring laser generation which is spectrally fixed at a chosen reference atomic absorption line. Such lasers are of interest as wavelength standards, in laser isotope separation and in DIAL lidars.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"234 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77075663","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.cff3
C. Labbé, J. Doualan, S. Girard, R. Moncorgé, M. Thuau
The ~2.8 µm laser transition of Er3+ ions is interesting for medical application. The transition takes place between the two excited states 4I11/2 and 4I13/2. In the fluoride crystals this emission is efficient due to low nonradiative processes between these two levels. The Er3+:BaY2F8 [1] is one of the most interesting crystals for 2.8 µm emission because the lifetime ratio between 4I11/2 and 4I13/2 is closed to one and the phonon energy is low compared to LiYF4. Some strong excitation transfer processes make difficult the prediction of the efficiency by a population rate equations model. It’s important to know the gain cross section and population inversion rate to predict the laser properties.
{"title":"Gain cross section measurements on the 2.8 µm laser transition of Er3+ doped BaY2F8 single crystal","authors":"C. Labbé, J. Doualan, S. Girard, R. Moncorgé, M. Thuau","doi":"10.1364/cleo_europe.1998.cff3","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cff3","url":null,"abstract":"The ~2.8 µm laser transition of Er3+ ions is interesting for medical application. The transition takes place between the two excited states 4I11/2 and 4I13/2. In the fluoride crystals this emission is efficient due to low nonradiative processes between these two levels. The Er3+:BaY2F8 [1] is one of the most interesting crystals for 2.8 µm emission because the lifetime ratio between 4I11/2 and 4I13/2 is closed to one and the phonon energy is low compared to LiYF4. Some strong excitation transfer processes make difficult the prediction of the efficiency by a population rate equations model. It’s important to know the gain cross section and population inversion rate to predict the laser properties.","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":"85525003","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.cwf38
I. Rousseau, B. Boulanger, J. Fève, B. Ménaert, G. Marnier
We performed a complete quantitative study of anisotropy of gray-tracking induced in flux-grown KTiOPO4 by a polarized 532 nm pulsed laser, on the basis of transmission measurements before and after irradiation. The laser has. a 10 Hz repetition rate and a 6.5 ns half-width duration at 1/e2; its polarization is orientated parallelly or orthogonally to the polar axis (z-axis) of KTP. Two kinds of experiments were realized: measurement of transmission spectra from 300 nm to 3000 nm with a spectrophotometer which we modified for crystal measurements with polarized light; measurements of transmission of a polarized HeNe probe which is superposed on the 532 nm beam.
{"title":"Anisotropies and intensity saturation of gray-tracking in KTiOPO4","authors":"I. Rousseau, B. Boulanger, J. Fève, B. Ménaert, G. Marnier","doi":"10.1364/cleo_europe.1998.cwf38","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cwf38","url":null,"abstract":"We performed a complete quantitative study of anisotropy of gray-tracking induced in flux-grown KTiOPO4 by a polarized 532 nm pulsed laser, on the basis of transmission measurements before and after irradiation. The laser has. a 10 Hz repetition rate and a 6.5 ns half-width duration at 1/e2; its polarization is orientated parallelly or orthogonally to the polar axis (z-axis) of KTP. Two kinds of experiments were realized: measurement of transmission spectra from 300 nm to 3000 nm with a spectrophotometer which we modified for crystal measurements with polarized light; measurements of transmission of a polarized HeNe probe which is superposed on the 532 nm beam.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85540549","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.cpd1.2
C. Dorrer, C. Le Blanc, F. Salin
Spectral phase modulation has been recognized as a powerful mean of generating arbitrary shaped waveforms in the temporal domain ([1], [2]) and of correcting spectral defects of Chirped Pulse Amplification systems ([3]), but results were always characterized by indirect means. We demonstrate here, for the first time to our knowledge, full phase control in an amplified system with arbitrary phase patterns using an absolute phase measurement at the output of the laser chain and a phase modulator at the input of the amplifier.
{"title":"Absolute phase control of amplified femtosecond pulses","authors":"C. Dorrer, C. Le Blanc, F. Salin","doi":"10.1364/cleo_europe.1998.cpd1.2","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cpd1.2","url":null,"abstract":"Spectral phase modulation has been recognized as a powerful mean of generating arbitrary shaped waveforms in the temporal domain ([1], [2]) and of correcting spectral defects of Chirped Pulse Amplification systems ([3]), but results were always characterized by indirect means. We demonstrate here, for the first time to our knowledge, full phase control in an amplified system with arbitrary phase patterns using an absolute phase measurement at the output of the laser chain and a phase modulator at the input of the amplifier.","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":"86924245","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.ctui6
V. Mikhailov, K. Yumashev, N. N. Posnov, I. A. Denisov, R. Moncorgé
Cr4+-doped crystals are known as lasing media for tunable solid state lasers in the near infrared spectral range as well as useful passive Q-switches for several solid-state lasers. These applications motivate an active search for new crystal hosts doped with the Cr4+ ion. Recently, room temperature laser action have been demonstrated for Cr4+-doped SrGd4(SiO4)3O (Cr4+:SrGdSOAP) and CaGd4(SiO4)3O (Cr4+:CaGdSOAP) crystals at 1.44 µm and 1.37 µm, respectively.
{"title":"Passive Q-switching and nonlinear spectroscopy of Cr4+: (Ca,Sr)Gd4(SiO4)3O crystals","authors":"V. Mikhailov, K. Yumashev, N. N. Posnov, I. A. Denisov, R. Moncorgé","doi":"10.1364/cleo_europe.1998.ctui6","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.ctui6","url":null,"abstract":"Cr4+-doped crystals are known as lasing media for tunable solid state lasers in the near infrared spectral range as well as useful passive Q-switches for several solid-state lasers. These applications motivate an active search for new crystal hosts doped with the Cr4+ ion. Recently, room temperature laser action have been demonstrated for Cr4+-doped SrGd4(SiO4)3O (Cr4+:SrGdSOAP) and CaGd4(SiO4)3O (Cr4+:CaGdSOAP) crystals at 1.44 µm and 1.37 µm, respectively.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84827673","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.cff7
C. Wyss, W. Lüthy, H. Weber
Micro-surgical applications using 3 µm Erbium lasers demand a pulsed output of more than 1 Watt, with pulse duration between 0.1 µs and 1 µs. In our paper we demonstrate pulses with the favorable duration for the first time in a 3 µm crystal laser. Scaling of the output power is performed using a new diode-laser pump source. The M4-factor of our diode laser module is an improvement of more than a factor of two compared to the best commercially available system.
{"title":"Q-switching and scaling of a diode-pumped Er: YLF laser at 2.8 µm","authors":"C. Wyss, W. Lüthy, H. Weber","doi":"10.1364/cleo_europe.1998.cff7","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cff7","url":null,"abstract":"Micro-surgical applications using 3 µm Erbium lasers demand a pulsed output of more than 1 Watt, with pulse duration between 0.1 µs and 1 µs. In our paper we demonstrate pulses with the favorable duration for the first time in a 3 µm crystal laser. Scaling of the output power is performed using a new diode-laser pump source. The M4-factor of our diode laser module is an improvement of more than a factor of two compared to the best commercially available system.","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":"85179339","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.cff2
M. Pollnau, C. Ghisler, W. Lüthy, H. Weber
Erbium-doped fluorozirconate (ZBLAN) fibers are promising candidates for the construction of compact and efficient all-solid-state 3-µm laser sources for surgical applications. Excited-state absorption (ESA) was found to have a major influence on the lasing properties of the erbium 3-µm transition in ZBLAN fibers. An approach has been suggested recently [1], which aims to avoid pump ESA and requires only low pump intensity, thus enabling high-power double-clad diode pumping of the erbium 3-µm fiber laser. However, the values of the relevant ESA cross-sections could not be determined experimentally so far. because the pump excitation is distributed between two metastable levels of erbium in ZBLAN, and ESA transitions from these two levels overlap in the spectral region of interest.
{"title":"Excited-State Absorption in ZBLAN:Er3+: Implications for a Diode-Pumped 3-µm Fiber Laser","authors":"M. Pollnau, C. Ghisler, W. Lüthy, H. Weber","doi":"10.1364/cleo_europe.1998.cff2","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cff2","url":null,"abstract":"Erbium-doped fluorozirconate (ZBLAN) fibers are promising candidates for the construction of compact and efficient all-solid-state 3-µm laser sources for surgical applications. Excited-state absorption (ESA) was found to have a major influence on the lasing properties of the erbium 3-µm transition in ZBLAN fibers. An approach has been suggested recently [1], which aims to avoid pump ESA and requires only low pump intensity, thus enabling high-power double-clad diode pumping of the erbium 3-µm fiber laser. However, the values of the relevant ESA cross-sections could not be determined experimentally so far. because the pump excitation is distributed between two metastable levels of erbium in ZBLAN, and ESA transitions from these two levels overlap in the spectral region of interest.","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84235555","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.cff1
L. Lefort, K. Puech, Y. Svirko, G. W. Ross, P. G. Smith, D. Hanna
Efficient sources of tunable coherent radiation in the near and mid-IR are necessary for many applications including spectroscopy, communications etc. In this contribution we report on the generation of tunable IR radiation obtained from a periodically poled lithium niobate (PPLN) based optical parametric oscillator (OPO).
{"title":"Optical parametric oscillation beyond 6.3µm in periodically-poled lithium niobate","authors":"L. Lefort, K. Puech, Y. Svirko, G. W. Ross, P. G. Smith, D. Hanna","doi":"10.1364/cleo_europe.1998.cff1","DOIUrl":"https://doi.org/10.1364/cleo_europe.1998.cff1","url":null,"abstract":"Efficient sources of tunable coherent radiation in the near and mid-IR are necessary for many applications including spectroscopy, communications etc. In this contribution we report on the generation of tunable IR radiation obtained from a periodically poled lithium niobate (PPLN) based optical parametric oscillator (OPO).","PeriodicalId":10610,"journal":{"name":"Conference on Lasers and Electro-Optics Europe","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81991660","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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