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2001 Fiscal Year Final Research Report Summary

Nonlinear optics in the VUV region utilizing autoionizing resonance of metallic atoms

Research Project

Project/Area Number 12440112
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

NAKAJIMA Takashi  Kyoto University/Institute of Advanced Energy/Assoc. Prof., エネルギー理工学研究所, 助教授 (50281639)

Co-Investigator(Kenkyū-buntansha) MATSUO Yukari  RIKEN/Senior Scientist, 先任研究員 (50231593)
SAKKA Tatsuo  Kyoto University/Institute of Advanced Energy/Assoc. Prof., エネルギー理工学研究所, 助教授 (10196206)
Project Period (FY) 2000 – 2001
Keywordsautoionizing state / frequency conversion / VUV (Vacuum Ultra-Biolet) / fou-wave mixing / laser-ablation / self-reversed absorption
Research Abstract

We have carried out theoretical research on a new scheme for the efficient generation of VUV light, propagation dynamics of light pulses, and possible applications of the generated VUV light. Because of the space limitation, we describe here the most important achievement of our project, namely the theoretical analysis of the newly proposed fbrwave mixing scheme for the efficient generation of VUV light : it is well known that the re-absorption processes of the generated wave through frequency conversion is the most crucial limiting factor against increasing the conversion efficiency. In order to solve this essential problem, we have utilized an autoionizing state. An autoionizing resonance is always accompanied by an absorption minimum located nearby, which is due to the quantum mechanical interference via atomic coherence of an autoionizing state. Therefore, if the incident laser frequencies are tuned such that the frequency of the generated wave coincides with the transition frequen … More cy from the initial state to the absorption minimum of the final (autoionizing) state, re-absorption can be significantly suppressed. Our detailed analysis has shown that the conversion efficiency can be improved by three orders of magnitude.
As for experiments, there are three important findings. First, by making use of a self-reversed absorption in an emission line of laser-induced plasma, we have developed a new method to determine the position-dependent densities of the corresponding upper and lower states, and applied it to the Al plasma. Second, we have developed a narrow-band pulsed dye-laser system, which is based on the amplification of a CW ring dye-laser by an excimer-pumped dye-laser. This narrow-band laser enables us to investigate the change of the translational velocity of laser-ablated species through optical detection. We have found that, in the time scale of a few microsecond after ablation in a buffer gas, the translational velocities of the ablated species exhibit pulsation. Less

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Takashi Nakajima: "Propagation of Phase-controlled lasers in a two-level medium"Physical Review A. 64. 434041-434066 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takashi Nakajima: "Electron spin-polarization in single-, two-and three-photon ionization of Xenon"Europhysics Letters. 57. 25-31 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takashi Nakajima: "Efficient sum-frequency mixing through transparency induced by autoionization"Optics Letters. 27. 116-118 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takashi Nakajima: "Influence of ac Stark shifts on the propagation of phase-controlled lasers in a two-level medium"Journal of the Optical Society of America B. 19. 261-267 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakka, K.Takatani, Y.H.Ogata, M.Mabuchi: "Laser ablation at the solid-liquid interface : Transient absorption of continuous spectral emission by ablated aluminum atoms"Journal of Physics D. 35. 65-73 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Saito, K.Takatani, T.Sakka, Y.H.Ogata: "Observation of the light emitting region produced by pulsed laser irradiation to a solid-liquid interface"Applied Surface Science. (未定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakka, K.Saito, Y.H.Ogata: "Emission spectra of the species ablated from a solid target submerged in liquid : Vibrational temperature of C_2 molecules in water-confined geometry"Applied Surface Science. (未定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mogi, Y.Fukuyama, T.Kobayashi, I.Tanihata, K.Uehara, Y.Matsuo: "Translational motion of SiO^+ produced by laser ablation"Applied Surface Science. (未定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kurata-Nishimura, F.Tokanai, Y.Matsuo, T.Kobayashi, J.Kawai, H.Kumagai, K.Midorikawa, I.Tanihata, Y.Hayashizaki: "Simultaneous atomization and ionization of large organic molecules using femtosecond laser ablation"Applied Surface Science. (未定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kurata-Nishiinura, F. Tokanai, Y. Matsuo, T. Kobayashi, J. Kawai, H. Kumagai, K. Midorikawa, I. Tanihata, Y. Hayashizaki: "Simultaneous atomization and ionization of large organic molecules using femtosecond laser ablation"Applied Surface Science. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakajima: "Propagation of phase-controlled lasers in a two-level medium"Physical Review A. 64. 434041-434066 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakajima, P. Lambropoulos: "Electron spin-polarization in single-, two- and three-photon ionization of Xenon"Europhysics Letters. 57. 25-31 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakajima: "Efficienr sum-frequency mixing through transparency induced by autoionization"Optics Letter. 27. 116-118 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takashi Nakajima: "Influence of ac Stark shifrs on the propagation of phase-controlled lasers"Journal of the Optical Society of America B. 19. 261-267 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sakka, K.Takatani, Y.H.Ogata, M. Mabuchi: "Laser ablation at the solid-liquid interface; Transient absorption of continuous sopectral emission by ablated aluminum atoms"Journal of Physics D. 35. 65-73 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Saito, K.Takatani, T.Sakke, Y.H.Ogata: "Observation of the light emitting region produced by pulsecd laser irradiation to a solid-liquid interface"Applied Surface Science. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakka, K. Saito, Y. H. Ogata: "Emission spectra of the species ablated from a solid target submerged in liquide: Vibrational temperature of C_2 molecules in water-confined geometry"Applied Surface Science. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Mogi, Y. Fukuyama, T. Kobayoshi, I. Tanihata, K. Uehara, Y. Matsuo: "Translational motion of SiO^+ produced by laser ablation"Applied Surface Science. (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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