Laser Emission

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Takunori Taira - One of the best experts on this subject based on the ideXlab platform.

  • neodymium concentration dependence of 0 94 1 06 and 1 34 μm Laser Emission and of heating effects under 809 and 885 nm diode Laser pumping of nd yag
    Applied Physics B, 2006
    Co-Authors: N Pavel, Voicu Lupei, Jiro Saikawa, Takunori Taira
    Abstract:

    Laser Emission in the 0.94-, 1.06- and 1.34-micron ranges in diluted and concentrated Nd:YAG crystals longitudinally pumped by a 885-nm diode Laser on the 4 I 9/2→4 F 3/2 transition is investigated. Continuous-wave operation at watt level in all these wavelength ranges is demonstrated with a 1.0-at. % Nd:YAG crystal; however, the Laser performance is impeded by the low pump absorption efficiency. Improved output power and overall efficiency were obtained with a highly doped 2.5-at. % Nd:YAG crystal: 5.5 W at 1.06 μm and 3.8 W at 1.34 μm with 0.38 and 0.26 efficiencies, respectively. Comparative results with traditional pumping at 809 nm into the highly absorbing 4 F 5/2 level are presented, showing the advantage of the direct 4 F 3/2 pumping. The influence of the lasing wavelength and of the Nd concentration on the thermal effects induced by the optical pumping in the Laser material is discussed. A clear relation between the heat generated in the Nd:YAG crystals in lasing and non-lasing regimes, a function of the Nd doping, is demonstrated.

  • 1 34 μm efficient Laser Emission in highly doped nd yag under 885 nm diode pumping
    Optics Express, 2005
    Co-Authors: N Pavel, Voicu Lupei, Takunori Taira
    Abstract:

    We report on 1.34-μm Laser Emission in Nd:YAG under diode pumping at 885 nm, directly into the 4F3/2 emitting level. 3.8 W of output power with 0.26 overall optical-to-optical efficiency was recorded from a 2.5-at.% Nd:YAG single-crystal. Comparative results obtained by classical pumping at 809 nm, in the highly absorbing 4F5/2 level, are presented, showing the advantage of the direct pumping. The influence of lasing wavelength and Nd concentration on the thermal effects induced by optical pumping into the active component is discussed.

  • highly efficient 1063 nm continuous wave Laser Emission in nd gdvo4
    Optics Letters, 2003
    Co-Authors: Voicu Lupei, N Pavel, Yoichi Sato, Takunori Taira
    Abstract:

    Highly efficient 1-μm continuous-wave Laser Emission in 3-mm-thick, 0.5- and 1.0-at. % Nd:GdVO4 crystals longitudinally pumped at 879 nm into the Laser emitting level is reported. Under Ti:sapphire pumping, the slope efficiency in absorbed power is ~80% for both crystals, while the slope efficiency, the optical-to-optical efficiency (at 1700-mW pump power), and the Laser threshold in incident power are 79%, 78%, and 31 mW for 0.5-at. % Nd and 80%, 77%, and 40 mW for 1.0-at. % Nd, respectively. The slope efficiency is close to the quantum defect limit, the difference being fully accounted for by the residual optical losses. Under 879-nm diode Laser pumping, the slope efficiency and the optical-to-optical efficiency in absorbed power of the 0.5-at. % Nd:GdVO4 crystal are 60% and 53%, owing to poorer superposition of the pumped and the Laser mode volumes.

  • highly efficient continuous wave 946 nm nd yag Laser Emission under direct 885 nm pumping
    Applied Physics Letters, 2002
    Co-Authors: Voicu Lupei, N Pavel, Takunori Taira
    Abstract:

    The 885-nm Ti:Sapphire pumping into the emitting level 4F3/2 of Nd:YAG produces a highly efficient (0.68 slope efficiency in absorbed power) 946-nm Laser Emission; a strong reduction of heat generation could be also obtained.

  • 1064 nm Laser Emission of highly doped nd yttrium aluminum garnet under 885 nm diode Laser pumping
    Applied Physics Letters, 2002
    Co-Authors: Voicu Lupei, N Pavel, Takunori Taira
    Abstract:

    Highly efficient 1064 nm continuous-wave Laser Emission under 885 nm diode pumping in concentrated Nd: Yttrium aluminum garnet (YAG) crystals (up to 3.5 at. % Nd) and ceramics (up to 3.8 at. % Nd) is reported. A highly doped (2.4 at. %) Nd:YAG Laser, passively Q switched by a Cr4+:YAG saturable absorber, is demonstrated.

Voicu Lupei - One of the best experts on this subject based on the ideXlab platform.

  • neodymium concentration dependence of 0 94 1 06 and 1 34 μm Laser Emission and of heating effects under 809 and 885 nm diode Laser pumping of nd yag
    Applied Physics B, 2006
    Co-Authors: N Pavel, Voicu Lupei, Jiro Saikawa, Takunori Taira
    Abstract:

    Laser Emission in the 0.94-, 1.06- and 1.34-micron ranges in diluted and concentrated Nd:YAG crystals longitudinally pumped by a 885-nm diode Laser on the 4 I 9/2→4 F 3/2 transition is investigated. Continuous-wave operation at watt level in all these wavelength ranges is demonstrated with a 1.0-at. % Nd:YAG crystal; however, the Laser performance is impeded by the low pump absorption efficiency. Improved output power and overall efficiency were obtained with a highly doped 2.5-at. % Nd:YAG crystal: 5.5 W at 1.06 μm and 3.8 W at 1.34 μm with 0.38 and 0.26 efficiencies, respectively. Comparative results with traditional pumping at 809 nm into the highly absorbing 4 F 5/2 level are presented, showing the advantage of the direct 4 F 3/2 pumping. The influence of the lasing wavelength and of the Nd concentration on the thermal effects induced by the optical pumping in the Laser material is discussed. A clear relation between the heat generated in the Nd:YAG crystals in lasing and non-lasing regimes, a function of the Nd doping, is demonstrated.

  • 1 34 μm efficient Laser Emission in highly doped nd yag under 885 nm diode pumping
    Optics Express, 2005
    Co-Authors: N Pavel, Voicu Lupei, Takunori Taira
    Abstract:

    We report on 1.34-μm Laser Emission in Nd:YAG under diode pumping at 885 nm, directly into the 4F3/2 emitting level. 3.8 W of output power with 0.26 overall optical-to-optical efficiency was recorded from a 2.5-at.% Nd:YAG single-crystal. Comparative results obtained by classical pumping at 809 nm, in the highly absorbing 4F5/2 level, are presented, showing the advantage of the direct pumping. The influence of lasing wavelength and Nd concentration on the thermal effects induced by optical pumping into the active component is discussed.

  • highly efficient 1063 nm continuous wave Laser Emission in nd gdvo4
    Optics Letters, 2003
    Co-Authors: Voicu Lupei, N Pavel, Yoichi Sato, Takunori Taira
    Abstract:

    Highly efficient 1-μm continuous-wave Laser Emission in 3-mm-thick, 0.5- and 1.0-at. % Nd:GdVO4 crystals longitudinally pumped at 879 nm into the Laser emitting level is reported. Under Ti:sapphire pumping, the slope efficiency in absorbed power is ~80% for both crystals, while the slope efficiency, the optical-to-optical efficiency (at 1700-mW pump power), and the Laser threshold in incident power are 79%, 78%, and 31 mW for 0.5-at. % Nd and 80%, 77%, and 40 mW for 1.0-at. % Nd, respectively. The slope efficiency is close to the quantum defect limit, the difference being fully accounted for by the residual optical losses. Under 879-nm diode Laser pumping, the slope efficiency and the optical-to-optical efficiency in absorbed power of the 0.5-at. % Nd:GdVO4 crystal are 60% and 53%, owing to poorer superposition of the pumped and the Laser mode volumes.

  • highly efficient continuous wave 946 nm nd yag Laser Emission under direct 885 nm pumping
    Applied Physics Letters, 2002
    Co-Authors: Voicu Lupei, N Pavel, Takunori Taira
    Abstract:

    The 885-nm Ti:Sapphire pumping into the emitting level 4F3/2 of Nd:YAG produces a highly efficient (0.68 slope efficiency in absorbed power) 946-nm Laser Emission; a strong reduction of heat generation could be also obtained.

  • 1064 nm Laser Emission of highly doped nd yttrium aluminum garnet under 885 nm diode Laser pumping
    Applied Physics Letters, 2002
    Co-Authors: Voicu Lupei, N Pavel, Takunori Taira
    Abstract:

    Highly efficient 1064 nm continuous-wave Laser Emission under 885 nm diode pumping in concentrated Nd: Yttrium aluminum garnet (YAG) crystals (up to 3.5 at. % Nd) and ceramics (up to 3.8 at. % Nd) is reported. A highly doped (2.4 at. %) Nd:YAG Laser, passively Q switched by a Cr4+:YAG saturable absorber, is demonstrated.

N Pavel - One of the best experts on this subject based on the ideXlab platform.

  • neodymium concentration dependence of 0 94 1 06 and 1 34 μm Laser Emission and of heating effects under 809 and 885 nm diode Laser pumping of nd yag
    Applied Physics B, 2006
    Co-Authors: N Pavel, Voicu Lupei, Jiro Saikawa, Takunori Taira
    Abstract:

    Laser Emission in the 0.94-, 1.06- and 1.34-micron ranges in diluted and concentrated Nd:YAG crystals longitudinally pumped by a 885-nm diode Laser on the 4 I 9/2→4 F 3/2 transition is investigated. Continuous-wave operation at watt level in all these wavelength ranges is demonstrated with a 1.0-at. % Nd:YAG crystal; however, the Laser performance is impeded by the low pump absorption efficiency. Improved output power and overall efficiency were obtained with a highly doped 2.5-at. % Nd:YAG crystal: 5.5 W at 1.06 μm and 3.8 W at 1.34 μm with 0.38 and 0.26 efficiencies, respectively. Comparative results with traditional pumping at 809 nm into the highly absorbing 4 F 5/2 level are presented, showing the advantage of the direct 4 F 3/2 pumping. The influence of the lasing wavelength and of the Nd concentration on the thermal effects induced by the optical pumping in the Laser material is discussed. A clear relation between the heat generated in the Nd:YAG crystals in lasing and non-lasing regimes, a function of the Nd doping, is demonstrated.

  • 1 34 μm efficient Laser Emission in highly doped nd yag under 885 nm diode pumping
    Optics Express, 2005
    Co-Authors: N Pavel, Voicu Lupei, Takunori Taira
    Abstract:

    We report on 1.34-μm Laser Emission in Nd:YAG under diode pumping at 885 nm, directly into the 4F3/2 emitting level. 3.8 W of output power with 0.26 overall optical-to-optical efficiency was recorded from a 2.5-at.% Nd:YAG single-crystal. Comparative results obtained by classical pumping at 809 nm, in the highly absorbing 4F5/2 level, are presented, showing the advantage of the direct pumping. The influence of lasing wavelength and Nd concentration on the thermal effects induced by optical pumping into the active component is discussed.

  • highly efficient 1063 nm continuous wave Laser Emission in nd gdvo4
    Optics Letters, 2003
    Co-Authors: Voicu Lupei, N Pavel, Yoichi Sato, Takunori Taira
    Abstract:

    Highly efficient 1-μm continuous-wave Laser Emission in 3-mm-thick, 0.5- and 1.0-at. % Nd:GdVO4 crystals longitudinally pumped at 879 nm into the Laser emitting level is reported. Under Ti:sapphire pumping, the slope efficiency in absorbed power is ~80% for both crystals, while the slope efficiency, the optical-to-optical efficiency (at 1700-mW pump power), and the Laser threshold in incident power are 79%, 78%, and 31 mW for 0.5-at. % Nd and 80%, 77%, and 40 mW for 1.0-at. % Nd, respectively. The slope efficiency is close to the quantum defect limit, the difference being fully accounted for by the residual optical losses. Under 879-nm diode Laser pumping, the slope efficiency and the optical-to-optical efficiency in absorbed power of the 0.5-at. % Nd:GdVO4 crystal are 60% and 53%, owing to poorer superposition of the pumped and the Laser mode volumes.

  • highly efficient continuous wave 946 nm nd yag Laser Emission under direct 885 nm pumping
    Applied Physics Letters, 2002
    Co-Authors: Voicu Lupei, N Pavel, Takunori Taira
    Abstract:

    The 885-nm Ti:Sapphire pumping into the emitting level 4F3/2 of Nd:YAG produces a highly efficient (0.68 slope efficiency in absorbed power) 946-nm Laser Emission; a strong reduction of heat generation could be also obtained.

  • 1064 nm Laser Emission of highly doped nd yttrium aluminum garnet under 885 nm diode Laser pumping
    Applied Physics Letters, 2002
    Co-Authors: Voicu Lupei, N Pavel, Takunori Taira
    Abstract:

    Highly efficient 1064 nm continuous-wave Laser Emission under 885 nm diode pumping in concentrated Nd: Yttrium aluminum garnet (YAG) crystals (up to 3.5 at. % Nd) and ceramics (up to 3.8 at. % Nd) is reported. A highly doped (2.4 at. %) Nd:YAG Laser, passively Q switched by a Cr4+:YAG saturable absorber, is demonstrated.

R Sastre - One of the best experts on this subject based on the ideXlab platform.

  • dye doped poss solutions random nanomaterials for Laser Emission
    Advanced Materials, 2009
    Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, Luis Cerdan, Virginia Martin, R Sastre
    Abstract:

    This research was financed by the Spanish MICINN under Project MAT2007–65778-C02–01. V.M. thanks Spanish CSIC for her JAE-Doc postdoctoral contract and L.C. thanks MICINN for a predoctoral scholarship (cofinanced by Fondo Social Europeo). Supporting Information is available online at Wiley InterScience or from the author

  • new analogues of the bodipy dye pm597 photophysical and lasing properties in liquid solutions and in solid polymeric matrices
    Journal of Physical Chemistry A, 2009
    Co-Authors: Angel Costela, I Garciamoreno, R Sastre, F Amatguerri, Marta Liras, Mercedes Pintadosierra, Lopez F Arbeloa, Banuelos J Prieto
    Abstract:

    New tailormade BODIPY dyes have been synthesized by a simple protocol to reach wavelength finely tunable Laser action from 540 to 625 nm while maintaining highly efficient and photostable Laser Emission. The new dyes are analogues of the commercial dye PM597 with the eight position free (PTH8) or substituted by the groups acetoxymethyl (PTAlk) or p-acetoxymethylphenyl (PTAr). The photophysical properties strongly depend on the geometrical distortion from planarity of the indacene core generated by the presence of the bulky 2,6-di-tert-butyl groups and the eight substituent. In both liquid and polymeric solid solutions, lasing efficiencies of up to 63 and 48%, respectively, were observed under transversal pumping at 532 nm with high photostabilities. In the case of PTAlk incorporated into silicon-containing solid organic matrices, the Laser Emission remained at 92% of its initial intensity value after 100 000 pumping pulses in the same position of the sample at 30 Hz repetition rate. The Laser action of th...

  • highly photostable solid state dye Lasers based on silicon modified organic matrices
    Journal of Applied Physics, 2007
    Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, D Del Agua, R Sastre
    Abstract:

    We report on the synthesis, characterization, and physical properties of modified polymeric matrices incorporating silicon atoms in their structure and doped with Laser dyes. When the silicon-modified organic matrices incorporated pyrromethene 567 (PM567) and pyrromethene 597 (PM597) dyes as actual solid solutions, highly photostable Laser operation with reasonable, nonoptimized efficiencies was obtained under transversal pumping at 532nm. At a pump repetition rate of 10Hz, the intensity of the Laser Emission remained at the level or above the initial lasing intensity after 100 000 pump pulses in the same position of the sample, corresponding to an estimated accumulated pump energy absorbed by the system of 518 and 1295GJ∕mol for PM567 and PM597, respectively. When the pump repetition rate was increased to 30Hz, the Laser Emission of dye PM567 decreased steadily and the output energy fell to one-half its initial value after an accumulated pump energy of 989 GJ/mol. Dye PM597 demonstrated a remarkable phot...

  • Laser Emission from mixtures of dipyrromethene dyes in liquid solution and in solid polymeric matrices
    Optics Communications, 2006
    Co-Authors: Miguel A Alvarez, Angel Costela, I Garciamoreno, F Amatguerri, Marta Liras, R Sastre
    Abstract:

    Laser Emission from binary mixtures of different dyes both in liquid solution and incorporated into solid polymeric matrices, covering the spectral region from green to red, is investigated. Mixtures of two synthesized dyes, analogs of the commercial dye Pyrromethene 567 (PM567), allowed covering the spectral range from green to orange. Tuning ranges in solid state of up to 42 nm with good photostabilities were demonstrated. To extend the tuning range to the red, binary mixtures of the dyes Pyrromethene 597 (PM597)/Pyrromethene 650 (PM650), PM567/DCM, and PM597/DCM were also studied. In liquid solution, a mixture of dyes PM567 and DCM allowed for narrow-linewidth Laser Emission continuously tunable over a range of 85 nm. In solid-state, mixtures of dyes PM597 and PM650 allowed Laser Emission tunable over two separate spectral regions up to a wavelength of 619 nm.

  • efficient and highly photostable solid state dye Lasers based on modified dipyrromethene bf 2 complexes incorporated into solid matrices of poly methyl methacrylate
    Applied Physics B, 2003
    Co-Authors: Angel Costela, I Garciamoreno, F Amatguerri, Marta Liras, Clara M Gomez, R Sastre
    Abstract:

    We report on the Laser action of modified dipyrromethene.BF2 complexes both dissolved in poly(methyl methacrylate) and copolymerized with methyl methacrylate. All recently synthesized dyes have the chromophore core of Laser dye pyrromethene 567, differing in the substituent in position 8. The new dyes showed important and most significant increases in both lasing efficiency and photostability. When the Laser samples were pumped transversely at 534 nm, Laser Emission was obtained with efficiencies of over 30% in most cases, to be compared with a lasing efficiency of 12% exhibited by reference dye pyrromethene 567 under the same experimental conditions. Some of the materials exhibited highly photostable Laser action, with no sign of degradation in the Laser output after 60000 pump pulses at the same position of the sample at a repetition rate of 10 Hz, whereas the Laser Emission of reference dye pyrromethene 567 dropped to zero after less than 40000 pump pulses.

Angel Costela - One of the best experts on this subject based on the ideXlab platform.

  • dye doped poss solutions random nanomaterials for Laser Emission
    Advanced Materials, 2009
    Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, Luis Cerdan, Virginia Martin, R Sastre
    Abstract:

    This research was financed by the Spanish MICINN under Project MAT2007–65778-C02–01. V.M. thanks Spanish CSIC for her JAE-Doc postdoctoral contract and L.C. thanks MICINN for a predoctoral scholarship (cofinanced by Fondo Social Europeo). Supporting Information is available online at Wiley InterScience or from the author

  • new analogues of the bodipy dye pm597 photophysical and lasing properties in liquid solutions and in solid polymeric matrices
    Journal of Physical Chemistry A, 2009
    Co-Authors: Angel Costela, I Garciamoreno, R Sastre, F Amatguerri, Marta Liras, Mercedes Pintadosierra, Lopez F Arbeloa, Banuelos J Prieto
    Abstract:

    New tailormade BODIPY dyes have been synthesized by a simple protocol to reach wavelength finely tunable Laser action from 540 to 625 nm while maintaining highly efficient and photostable Laser Emission. The new dyes are analogues of the commercial dye PM597 with the eight position free (PTH8) or substituted by the groups acetoxymethyl (PTAlk) or p-acetoxymethylphenyl (PTAr). The photophysical properties strongly depend on the geometrical distortion from planarity of the indacene core generated by the presence of the bulky 2,6-di-tert-butyl groups and the eight substituent. In both liquid and polymeric solid solutions, lasing efficiencies of up to 63 and 48%, respectively, were observed under transversal pumping at 532 nm with high photostabilities. In the case of PTAlk incorporated into silicon-containing solid organic matrices, the Laser Emission remained at 92% of its initial intensity value after 100 000 pumping pulses in the same position of the sample at 30 Hz repetition rate. The Laser action of th...

  • highly photostable solid state dye Lasers based on silicon modified organic matrices
    Journal of Applied Physics, 2007
    Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, D Del Agua, R Sastre
    Abstract:

    We report on the synthesis, characterization, and physical properties of modified polymeric matrices incorporating silicon atoms in their structure and doped with Laser dyes. When the silicon-modified organic matrices incorporated pyrromethene 567 (PM567) and pyrromethene 597 (PM597) dyes as actual solid solutions, highly photostable Laser operation with reasonable, nonoptimized efficiencies was obtained under transversal pumping at 532nm. At a pump repetition rate of 10Hz, the intensity of the Laser Emission remained at the level or above the initial lasing intensity after 100 000 pump pulses in the same position of the sample, corresponding to an estimated accumulated pump energy absorbed by the system of 518 and 1295GJ∕mol for PM567 and PM597, respectively. When the pump repetition rate was increased to 30Hz, the Laser Emission of dye PM567 decreased steadily and the output energy fell to one-half its initial value after an accumulated pump energy of 989 GJ/mol. Dye PM597 demonstrated a remarkable phot...

  • Laser Emission from mixtures of dipyrromethene dyes in liquid solution and in solid polymeric matrices
    Optics Communications, 2006
    Co-Authors: Miguel A Alvarez, Angel Costela, I Garciamoreno, F Amatguerri, Marta Liras, R Sastre
    Abstract:

    Laser Emission from binary mixtures of different dyes both in liquid solution and incorporated into solid polymeric matrices, covering the spectral region from green to red, is investigated. Mixtures of two synthesized dyes, analogs of the commercial dye Pyrromethene 567 (PM567), allowed covering the spectral range from green to orange. Tuning ranges in solid state of up to 42 nm with good photostabilities were demonstrated. To extend the tuning range to the red, binary mixtures of the dyes Pyrromethene 597 (PM597)/Pyrromethene 650 (PM650), PM567/DCM, and PM597/DCM were also studied. In liquid solution, a mixture of dyes PM567 and DCM allowed for narrow-linewidth Laser Emission continuously tunable over a range of 85 nm. In solid-state, mixtures of dyes PM597 and PM650 allowed Laser Emission tunable over two separate spectral regions up to a wavelength of 619 nm.

  • efficient and highly photostable solid state dye Lasers based on modified dipyrromethene bf 2 complexes incorporated into solid matrices of poly methyl methacrylate
    Applied Physics B, 2003
    Co-Authors: Angel Costela, I Garciamoreno, F Amatguerri, Marta Liras, Clara M Gomez, R Sastre
    Abstract:

    We report on the Laser action of modified dipyrromethene.BF2 complexes both dissolved in poly(methyl methacrylate) and copolymerized with methyl methacrylate. All recently synthesized dyes have the chromophore core of Laser dye pyrromethene 567, differing in the substituent in position 8. The new dyes showed important and most significant increases in both lasing efficiency and photostability. When the Laser samples were pumped transversely at 534 nm, Laser Emission was obtained with efficiencies of over 30% in most cases, to be compared with a lasing efficiency of 12% exhibited by reference dye pyrromethene 567 under the same experimental conditions. Some of the materials exhibited highly photostable Laser action, with no sign of degradation in the Laser output after 60000 pump pulses at the same position of the sample at a repetition rate of 10 Hz, whereas the Laser Emission of reference dye pyrromethene 567 dropped to zero after less than 40000 pump pulses.

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