D Jaque

Publications (103)224.72 Total impact

• Article: Compact, highly efficient ytterbium doped bismuthate glass waveguide laser.

  R Mary, S J Beecher, G Brown, R R Thomson, D Jaque, S Ohara, A K Kar
  [show abstract] [hide abstract]
  ABSTRACT: Laser slope efficiencies close to the quantum defect limit and in excess of 78% have been obtained from an ultrafast laser inscribed buried channel waveguide fabricated in a ytterbium-doped bismuthate glass. The simultaneous achievement of low propagation losses and preservation of the fluorescence properties of ytterbium ions is the basis of the outstanding laser performance.
  Optics Letters 05/2012; 37(10):1691-3. · 3.40 Impact Factor
• Article: Near-field local enhancement by ordered arrays of sub-wavelength scattering centers fabricated by femtosecond ablation

  J. Barrio, J. Lamela, A. Ródenas, G. Zhou, G. Lifante, F. Jaque, D. Jaque, M. Gu
  [show abstract] [hide abstract]
  ABSTRACT: We show how the ultrafast laser inscription of nanodimple arrays enables near-field local enhancement in high refractive-index crystals. We first demonstrate both experimentally and numerically how, when two nanodimples are separated by intermediate distances (700–1000nm), near-field interference can take place resulting in a near-field enhancement between nanodimples. Based on this effect, near-field enhancements close to 60% are then demonstrated at the center of nanodimple arrays, and strong optical contrasts in excess of 100% are produced. The integration of these arrays into crystal substrates provides a versatile tool for new optical trapping and evanescent-field nanosensing devices.
  Applied Physics B 05/2012; 103(1):51-55. · 2.19 Impact Factor
• Article: Room-temperature continuous wave laser oscillations in Nd:YAG ceramic waveguides produced by carbon ion implantation

  Y. Tan, C. Zhang, F. Chen, F.-Q. Liu, D. Jaque, Q.-M. Lu
  [show abstract] [hide abstract]
  ABSTRACT: We report on the generation of continuous wave lasers at a wavelength of ∼1064nm in a Nd:YAG ceramic waveguide at room temperature. The waveguide was fabricated by using 6MeV carbon ion implantation at a fluence of 3×1014ions/cm2. Laser operation has been realized with a slope efficiency as high as ∼11%. The pump threshold of an 808-nm laser beam for the waveguide laser oscillation is 19.5mW.
  Applied Physics B 04/2012; 103(4):837-840. · 2.19 Impact Factor
• Article: Lattice micro-modifications induced by Zn diffusion in Nd:LiNbO3 channel waveguides probed by Nd3+ confocal micro-luminescence

  D. Jaque, E. Cantelar, G. Lifante
  [show abstract] [hide abstract]
  ABSTRACT: The luminescence properties of Neodymium ions in Zn diffused LiNbO3 channel waveguides have been studied with sub-micrometric spatial resolution. The analysis of the luminescence spectra suggests the existence of a local expansion and disordering associated to the presence of Zn in the LiNbO3 lattice after the diffusion process. By taking this cause–effect relation into account, it has been possible to determine both the in-depth and lateral Zn diffusion lengths, as well to elucidate the spatial location of the channel waveguide.
  Applied Physics B 04/2012; 88(2):201-204. · 2.19 Impact Factor
• Source

  Available from: Airán Ródenas Seguí

  Article: Refractive index change mechanisms in femtosecond laser written ceramic Nd:YAG waveguides: micro-spectroscopy experiments and beam propagation calculations

  A. Ródenas, G. A. Torchia, G. Lifante, E. Cantelar, J. Lamela, F. Jaque, L. Roso, D. Jaque
  [show abstract] [hide abstract]
  ABSTRACT: The effect that femtosecond laser filamentation has on the refractive index of Nd:YAG ceramics, and which leads to the formation of waveguide lasers, has been studied by micro-spectroscopy imaging, beam propagation experiments and calculations. From the analysis of the Nd3+ luminescence and Raman images, two main types of laser induced modifications have been found to contribute to the refractive-index change: (i) a lattice defect contribution localized along the self-focusing volume of the laser pulses, in which lattice damage causes a refractive-index decrease, and (ii) a lattice strain-field contribution around and inside the filaments, in which the pressure-driven variation of the inter-atomic distances causes refractive-index variations. Scanning near-field optical-transmission and end-coupling experiments, in combination with beam propagation calculations, have been used to quantitatively determine the corresponding contribution of each effect to the refractive-index field of double-filament waveguides. Results indicate that the strain-field induced refractive-index increment is the main mechanism leading to waveguiding, whereas the damage-induced refractive-index reduction at filaments leads to a stronger mode confinement.
  Applied Physics B 04/2012; 95(1):85-96. · 2.19 Impact Factor
• Source

  Available from: Ajoy K Kar

  Article: Ultrafast laser writing of optical waveguides in ceramic Yb:YAG: a study of thermal and non-thermal regimes

  A. Benayas, W. F. Silva, A. Ródenas, C. Jacinto, J. Vázquez de Aldana, F. Chen, Y. Tan, R. R. Thomsom, N. D. Psaila, D. T. Reid, G. A. Torchia, A. K. Kar, D. Jaque
  [show abstract] [hide abstract]
  ABSTRACT: We report the improvement of ultrafast laser written optical waveguides in Yb:YAG ceramics by tailoring the presence of heat accumulation effects. From a combination of ytterbium micro-luminescence and micro-Raman structural analysis, maps of lattice defects and stress fields have been obtained. We show how laser annealing can strongly reduce the concentration of defects and also reduce compressive stress, leading to an effective 50% reduction in the propagation losses and to more extended and symmetric propagation modes.
  Applied Physics A 04/2012; 104(1):301-309. · 1.63 Impact Factor
• Article: Laser gain in femtosecond microstructured Nd:MgO:LiNbO3 crystals

  G.A. Torchia, C. Mendez, I. Arias, L. Roso, A. Ródenas, D. Jaque
  [show abstract] [hide abstract]
  ABSTRACT: Femtosecond laser writing has been used to create 1D and 2D diffracting microstructures in Nd3+:MgO co-doped LiNbO3 crystals. The main characteristics of the diffracting device, such as its polarization dependence and diffraction efficiency have been investigated, showing that first order diffraction efficiencies in excess of 35% can be achieved. We have demonstrated that continuous wave laser oscillation from Nd3+ ions at 1.06μm can be generated through the integrated diffraction gratings, thus leading to non-collinear intracavity laser propagation. The laser performance, in terms of laser thresholds and slope efficiencies, is reported and explained. The achievement of a controlled non-collinear propagation is an interesting feature in multi-frequency lasers, optical communication and optical switching.
  Applied Physics B 04/2012; 83(4):559-563. · 2.19 Impact Factor
• Article: Deep tissue bio-imaging using two-photon excited CdTe fluorescent quantum dots working within the biological window.

  L M Maestro, J E Ramírez-Hernández, N Bogdan, J A Capobianco, F Vetrone, J García Solé, D Jaque
  [show abstract] [hide abstract]
  ABSTRACT: A new approach to deep tissue imaging is presented based on 8 nm CdTe semiconductor quantum dots (QDs). The characteristic 800 nm emission was found to be efficiently excited via two-photon absorption of 900 nm photons. The fact that both excitation and emission wavelengths lie within the "biological window" allows for high resolution fluorescence imaging at depths close to 2 mm. These penetration depths have been used to obtain the first deep tissue multiphoton excited fluorescence image based on CdTe-QDs. Due to the large thermal sensitivity of CdTe-QDs, one may envisage, in the near future, their use in high resolution deep-tissue thermal imaging.
  Nanoscale 11/2011; 4(1):298-302. · 5.91 Impact Factor
• Source

  Available from: Airán Ródenas Seguí

  Article: Direct laser writing of near-IR step-index buried channel waveguides in rare earth doped YAG.

  A Rodenas, A Benayas, J R Macdonald, J Zhang, D Y Tang, D Jaque, A K Kar
  [show abstract] [hide abstract]
  ABSTRACT: A new (to our knowledge) ultrashort laser pulse irradiation regime that allows us to directly modify and increase the refractive index of rare earth doped YAG polycrystalline ceramics has been identified. Single-mode buried channel waveguides in both Ho:YAG and Er:YAG ceramics at the near-IR wavelengths of 1.55 μm and 1.95 μm are demonstrated by fabricating positive square step-index cores. Minimum propagation losses of 1.5 dB cm(-1) at a 1.51 μm wavelength have been preliminarily obtained. Confocal microluminescence mapping reveals that the increased refractive index regions retain the near-IR spectral properties of Er3+ ions in the YAG crystalline matrix.
  Optics Letters 09/2011; 36(17):3395-7. · 3.40 Impact Factor
• Source

  Available from: if.ufal.br

  Article: Microspectroscopy of ultrafast laser inscribed channel waveguides in Yb:tungstate crystals

  F. M. Bain, W. F. Silva, A. A. Lagatsky, R. R. Thomson, N. D. Psaila, A. K. Kar, W. Sibbett, D. Jaque, C. T. A. Brown
  [show abstract] [hide abstract]
  ABSTRACT: We report microspectroscopy measurements of crystalline channel waveguides fabricated in Yb:KGd(WO4)2 and Yb:KY(WO4)2 using the ultrafast laser inscription technique. From these measurements we find that densification of the WO2W bridge in the double tungstate crystal lattice is responsible for the refractive index increase, which creates the waveguide confinement. We identified that shifts toward lower energies in the ∼ 760 cm−1 Raman mode indicate regions, which guide light polarized along the crystallographic b axis, while higher energy shifts in the 682 and 898 cm−1 Raman lines correspond to guiding regions for light polarized along the crystallographic a axis.
  Applied Physics Letters 04/2011; 98(14):141108-141108-3. · 3.84 Impact Factor
• Source

  Available from: Carlos Jacinto

  Article: Luminescence Quantum Efficiency of Garnet Laser Ceramics Determined by Pump-Induced Line Broadening

  A. Benayas, D. Jaque, C. Jacinto, A.A. Kaminskii
  [show abstract] [hide abstract]
  ABSTRACT: Pump-induced line broadening has been used to investigate the thermal loading of laser-diode-pumped Nd³⁺:Y₃Al₅O₁₂ laser ceramics with different Nd³⁺ -ion concentrations. This new method here proposed allow us to obtain, in an easy and direct way, the concentration dependence of the luminescence quantum efficiency of Nd³⁺-ions in Y₃Al₅O₁₂ ceramics. The experimentally obtained concentration-induced quantum efficiency quenching has been found to be in a very good accordance with theoretical models.
  IEEE Journal of Quantum Electronics 01/2011; · 1.88 Impact Factor
• Source

  Available from: Ajoy K Kar

  Article: Microstructuring of Nd:YAG crystals by proton-beam writing.

  A Benayas, D Jaque, Y Yao, F Chen, A A Bettiol, A Rodenas, A K Kar
  [show abstract] [hide abstract]
  ABSTRACT: We report on the microstructuring of Nd:YAG crystals by direct proton-beam writing. Buried channel waveguides have been fabricated with full spatial control by the combined variation of crystal position and proton energy. The fluorescence images of the obtained structures have been used to evaluate the potential application of the fabricated structures for laser gain as well as to elucidate the mechanism at the basis of the refractive index increment induced at the end of the proton path. We have concluded that this increment is very likely a local enhancement in the electronic polarizability caused by nuclear collisions.
  Optics Letters 12/2010; 35(23):3898-900. · 3.40 Impact Factor
• Article: Swift heavy-ion irradiated active waveguides in Nd:YAG crystals: fabrication and laser generation.

  Yingying Ren, Ningning Dong, Feng Chen, A Benayas, D Jaque, Feng Qiu, Tadashi Narusawa
  [show abstract] [hide abstract]
  ABSTRACT: An Nd:YAG planar waveguide laser has been fabricated by ultra-low-fluence (2×10(12) cm(-2)) swift heavy-ion irradiation (60 MeV Ar(4+) ions). The appearance of the buried waveguiding has been associated with an increased refractive index layer as a consequence of the ion-induced electronic damage. Continuous-wave laser oscillations at 1064.2 nm have been observed from the waveguide under 808 nm optical excitation, with the absorbed pump power at threshold and laser slope efficiency close to 26 mW and 5.9%, respectively.
  Optics Letters 10/2010; 35(19):3276-8. · 3.40 Impact Factor
• Article: Luminescence of Rare Earth Ions in Strontium Barium Niobate Around the Phase Transition: The Case of Tm3 + Ions

  U. CaldiñO, P. Molina, M. O. Ramirez, D. Jaque, L. E. Bausa, C. Zaldo, L. Ivleva, M. Bettinelli, J. Garcia Solé
  [show abstract] [hide abstract]
  ABSTRACT: The photoluminescence of ferroelectric Sr 0.6 Ba 0.4 (NbO 3 ) 2 congruent crystals doped with four different trivalent rare earth ions, Nd 3+ , Eu 3+ , Tm 3+ and Yb 3+ , has been examined in the temperature range around the Curie temperature, when the system undergoes the transition to the paraelectric phase. While the luminescence of large ions is not sensitive (Nd 3+ ) or weakly sensitive (Eu 3+ ) to the phase transition, that of small ions (Tm 3 + and Yb 3 + ) is highly sensitive to temperature changes around the Curie temperature. Particular emphasis is given to the Sr 0.6 Ba 0.4 (NbO 3 ) 2 :Tm 3 + system, for which the luminescence spectra around the phase transition and low temperature laser site selective spectra are systematically investigated. The different spectral sensitivity of the rare earth ions to the phase transition is interpreted in terms of the lattice sites occupied by the different rare earth ions in the Strontium Barium Niobate crystal host.
  Ferroelectrics. 09/2010; 363(2008):150-162.
• Source

  Available from: JR de Aldana

  Article: Continuous wave laser generation at 1064 nm in femtosecond laser inscribed Nd:YVO4 channel waveguides

  Yang Tan, Feng Chen, J. R. Vázquez de Aldana, G. A. Torchia, A. Benayas, D. Jaque
  [show abstract] [hide abstract]
  ABSTRACT: We report on continuous wave 1064 nm laser generation from an ultrafast laser inscribed neodymium-doped yttrium orthovanadate channel waveguide with pumping at 808 nm. Single-mode stable laser operations have been observed with pump powers at threshold as low as 14 mW and with laser slope efficiencies as high as 38.7%.
  Applied Physics Letters 07/2010; 97(3):031119-031119-3. · 3.84 Impact Factor
• Chapter: Mirrorless Continuous Wave Laser Emission from Nd:YAG Ceramic Femtosecond‐Written Waveguides

  A. Benayas, D. Jaque, A. Ródenas, E. Cantelar, L. Roso, G.A. Torchia
  07/2010: pages 649 - 654; , ISBN: 9780470640845
• Article: Femtosecond-laser-written, stress-induced Nd:YVO4 waveguides preserving fluorescence and Raman gain.

  W F Silva, C Jacinto, A Benayas, J R Vazquez de Aldana, G A Torchia, F Chen, Y Tan, D Jaque
  [show abstract] [hide abstract]
  ABSTRACT: We report the formation of optical waveguides in the self-Raman Nd:YVO(4) laser crystal by femtosecond laser inscription. The confocal fluorescence and Raman images have revealed that the waveguide is constituted by a locally compressed area in which the original fluorescence and Raman gains of the Nd:YVO(4) system are preserved. Thus the obtained structures emerge as promising candidates for highly efficient self-Raman integrated laser sources.
  Optics Letters 04/2010; 35(7):916-8. · 3.40 Impact Factor
• Article: Thermal stability of microstructural and optical modifications induced in sapphire by ultrafast laser filamentation

  A. Benayas, D. Jaque, Ben McMillen, K. P. Chen
  [show abstract] [hide abstract]
  ABSTRACT: We report on the thermal stability of both structural and optical micromodifications created by ultrafast laser written filaments in sapphire crystals. By using the Cr ³⁺ traces as optical probes, we have concluded that the filaments are constituted by both reversible and nonreversible defects with very different spatial locations. The strain field measured from the analysis of R lines has been found to be erased at the same time when the reversible centers are recombined (∼1100 ° C ) . This fact seems to indicate that these defects act as pinning centers for the induced stress. Furthermore, we have found that the waveguide generated in the proximity of the filament disappear for annealing temperatures above 1100 ° C . This clearly supports the assumption that waveguiding is produced by the strain stress induced refractive index increment based on the dominant electronic polarizability enhancement.
  Journal of Applied Physics 03/2010; · 2.17 Impact Factor
• Article: Thermally resistant waveguides fabricated in Nd:YAG ceramics by crossing femtosecond damage filaments.

  A Benayas, W F Silva, C Jacinto, E Cantelar, J Lamela, F Jaque, J R Vázquez de Aldana, G A Torchia, L Roso, A A Kaminskii, D Jaque
  [show abstract] [hide abstract]
  ABSTRACT: We report on femtosecond laser writing of channel waveguides in Nd(3+) ion doped YAG ceramics by multiple inscriptions of damage filaments. Waveguiding between filaments was found to resist annealing temperatures as high as 1500 degrees C. Microluminescence imaging experiments have been carried out to elucidate the potential application of the obtained waveguides as integrated laser sources as well as to elucidate the waveguiding mechanisms.
  Optics Letters 02/2010; 35(3):330-2. · 3.40 Impact Factor
• Article: Q‐switched nanosecond Nd3+:Ca(NbO3)2 crystalline self‐Raman laser with single‐step cascade SE (λSE = 1.0615 μ m of 4F3/2 → 4I11/2 channel) → SRS (λSt 1 = 1.1741μ m of ωSRS ≈ 904 cm–1 promotion vibration mode) wavelength conversion

  A.A. Kaminskii, J. Dong, K. Ueda, M. Bettinelli, M. Grinberg, D. Jaque
  [show abstract] [hide abstract]
  ABSTRACT: A passively Q-switched nanosecond Nd3+:Ca(NbO3)2 self-Raman laser with 0.808-μ m laser-diode pumping has been demonstrated, operating by nonlinear cascaded scheme at converted wavelength of Nd3+ one-micron stimulated emission. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
  Laser Physics Letters 08/2009; 6(11):782 - 787. · 9.97 Impact Factor