WO1999047973A1 - Procede de production d'un materiau de regulation des ondes lumineuses et materiau de regulation des ondes lumineuses ainsi produit - Google Patents

Procede de production d'un materiau de regulation des ondes lumineuses et materiau de regulation des ondes lumineuses ainsi produit Download PDF

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Publication number
WO1999047973A1
WO1999047973A1 PCT/JP1998/005176 JP9805176W WO9947973A1 WO 1999047973 A1 WO1999047973 A1 WO 1999047973A1 JP 9805176 W JP9805176 W JP 9805176W WO 9947973 A1 WO9947973 A1 WO 9947973A1
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WO
WIPO (PCT)
Prior art keywords
wave control
light
glass
control material
light wave
Prior art date
Application number
PCT/JP1998/005176
Other languages
English (en)
Japanese (ja)
Inventor
Takumi Fujiwara
Akira Ikushima
Kazuya Saito
Original Assignee
Toyota Jidosha Kabushiki Kaisha
Toyota School Foundation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Jidosha Kabushiki Kaisha, Toyota School Foundation filed Critical Toyota Jidosha Kabushiki Kaisha
Priority to AU11728/99A priority Critical patent/AU1172899A/en
Publication of WO1999047973A1 publication Critical patent/WO1999047973A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/355—Non-linear optics characterised by the materials used
    • G02F1/3558—Poled materials, e.g. with periodic poling; Fabrication of domain inverted structures, e.g. for quasi-phase-matching [QPM]

Definitions

  • the present invention relates to a method for producing a lightwave control material obtained by subjecting a glass material to an ultraviolet excitation poling treatment, and a lightwave control material.
  • a light wave control material using a glass material can be obtained.
  • the obtained light wave control material has a considerably large second-order optical nonlinearity.
  • the ability as a lightwave control material can be improved.
  • An object of the present invention is to obtain a light-wave control material having a large second-order optical nonlinearity.
  • the method for producing a light-wave control material according to the present invention includes a step of applying a treatment to a glass material to increase oxygen-deficient defects in the glass, and irradiating the treated glass material with an ultraviolet ray while applying an electric field to the glass material. It is characterized by performing polling processing. After performing treatment to increase oxygen-deficient defects, UV-excited poling generates more defects called GeE 'centers based on the oxygen-deficient defects. Therefore, it is possible to obtain a light-wave control material having a larger second-order optical non-linearity as compared with the case where the glass material is directly subjected to ultraviolet excitation poling.
  • the present invention is characterized in that the treatment for increasing the number of oxygen-deficient defects is a treatment for heating a glass material in a vacuum.
  • the treatment for increasing the number of oxygen-deficient defects is a treatment for heating a glass material in a vacuum.
  • the present invention is characterized in that the glass material is a Ge-added SiO 2 glass.
  • Ge-doped SiO 2 glass is a material used as a core material of an optical fiber and the like, and is preferable as a light wave control material.
  • Ge is incorporated into the structure of the glass material, and oxygen-deficient defects are likely to occur in connection with the presence of Ge.
  • the light-wave control material according to the present invention is a Ge-doped SiO 2 glass, wherein the second-order optical nonlinearity is 5 pm / V or more as a nonlinear optical constant d.
  • FIG. 1 is a flowchart illustrating the manufacturing method according to the embodiment.
  • FIG. 2 is a diagram showing the structure of an oxygen-deficient defect.
  • FIG. 3 is a diagram showing a light absorption spectrum of a heat-treated material.
  • FIG. 4 is a diagram showing the second-order optical nonlinearity of a material subjected to UV-excited poling.
  • FIG. 5 is a diagram showing a light absorption spectrum of a material subjected to poling with ultraviolet excitation.
  • FIG. 6 is a diagram showing the structure of the GeE ′ center. [Best Mode for Carrying Out the Invention]
  • FIG. 1 is a flowchart showing a method for producing a lightwave control material using the glass material according to the present invention.
  • a glass material is prepared (S11).
  • Ge-added SiO 2 glass is used as the glass material.
  • 15. 7 G e 0 2 - can be adopted a 84. 3 S i 0 2 (mo 1%) Ge added S i 0 2 glass as such. It is possible to add an element other than Ge, but also in this case, an element to be tetravalently added is preferable.
  • the prepared glass material is heat-treated in a vacuum (S12).
  • a vacuum By performing the heat treatment in a vacuum, the glass material is heated under conditions where the oxygen partial pressure of the atmosphere of the glass material is low.
  • NOD V Neutral Oxygen Di-Vacancy
  • NOMV Neutral Oxygen Mono Vacancy
  • Vacuum is preferably as low, is sufficient extent 3 X 1 0- 2 T orr ( 4 P a). The higher the temperature, the better, but a temperature at which the glass material can maintain its shape, for example, a temperature of about 1200 ° C. is preferable.
  • the time is preferably 1 hour or more in order to promote a sufficient escape of oxygen.
  • Figure 3 shows the light absorption spectrum of such a glass material that has been heat-treated in vacuum.
  • Anoxic defects NOMV and NODV
  • NOMV and NODV Anoxic defects
  • the absorption peak around 5 eV in this figure is caused by oxygen-deficient defects. From this figure, it can be seen that the absorption near 5 eV is surely increased by the heat treatment in a vacuum, and the oxygen-deficient defects increase by the heat treatment in a vacuum. If there is no oxygen in the atmosphere, oxygen can escape from the glass material even without vacuum, but other elements may be mixed in instead, so heat treatment in vacuum is considered preferable. .
  • UV-excited poly- (S13).
  • the ultraviolet excitation poling process is performed, for example, by irradiating an ultraviolet laser beam as a pulse with an electric field of 1 ⁇ 10 5 to 8 ⁇ 10 5 V / cm applied.
  • an Ar F excimer laser (wavelength 193 nm) is used as the ultraviolet light source, the energy density of the irradiated laser is about 100 mJ / cm 2 / pulse, the pulse repetition frequency is about 10 Hz, and the light energy is 6. It is preferable that the pulse irradiation number is about 4 eV and the pulse irradiation number is about 10 5 .
  • Figure 4 shows the results of examining the magnitude (d constant) of the second-order optical nonlinearity of the light-wave control material obtained by changing the intensity of the applied electric field and performing UV excitation poling.
  • the vacuum heat treatment 1200 ° C, 5 hours, and employing the conditions of 3 x 10- 2 T orr (4Pa ).
  • the magnitude of the second-order optical nonlinearity does not increase regardless of whether the heat treatment is performed or not, even if the electric field strength is 1.5 x 10 5 V / cm or more.
  • the second-order optical nonlinearity at that time was 3.4 ⁇ 0.2 pm / V as the nonlinear optical constant d for the one without heat treatment, and 5.1 ⁇ 0.3 pm / V for the one with heat treatment. ing.
  • the second-order optical nonlinearity of the light-wave control material obtained by UV-excited poling can be increased, and the nonlinear optical constant d (d is the SHG (second-order harmonic) constant. 33 ) It is possible to obtain a light-wave control material having a large second-order optical nonlinearity of about 5 pm / V. D values of L INb_ ⁇ 3 crystalline material well known as a material having a second-order optical nonlinearity (d 13) is about 4.7, while the light wave controlling material of the present embodiment is a glass material It has a large second-order optical nonlinearity exceeding that of crystalline materials. Such a glass material has not been known at all, and can be suitably used for various types of light control elements.
  • FIG. 5 shows light absorption spectra of a light wave control material obtained by performing ultraviolet excitation polling on a glass material subjected to vacuum heat treatment and a glass material not subjected to vacuum heat treatment.
  • the absorption peak for light near the energy of 6 eV is large.
  • the G e added S i 0 2 glass is known to GeE 'Sen evening one having a beak of the absorption in the vicinity of 6 eV is present.
  • the GeE 'Sen evening - as shown in FIG. 6, oxygen electrons are localized in the Ge 4 + 3 coordinated, dangling • It is said to be a structure that becomes a bond and a structure that causes secondary optical nonlinearity. It can be seen that GeE 'centers are created by UV-excited poling, and more GeE' centers are created especially by performing vacuum heat treatment in advance.
  • the light absorption near 5 to 6 eV of the light wave control material includes light from GEC (GermaniuiD Electron Center) and STH (Self-Trapped Hole Center) in addition to the above NOMV, NOD V, and GeE 'centers. There is absorption.
  • GEC GermaniuiD Electron Center
  • STH Self-Trapped Hole Center
  • Vacuum heat treatment was set to 1200 ° C, 5 hours in a vacuum of 3 X 10- 2 T orr (4 P a).
  • the vacuum heat treatment was not performed, and the other processing conditions were the same.
  • the Ge-doped glass material is subjected to the vacuum heat treatment, and then the ultraviolet excitation poling treatment is performed.
  • the ultraviolet excitation poling treatment is performed.
  • a material having an epoch-making large second-order optical nonlinearity can be obtained as a light wave control material obtained after the ultraviolet excitation polling treatment.
  • Ge-added SiO 2 glass is preferable, but another tetravalent additive may be added.
  • the amount of Ge to be added is preferably about 12 to 30 mo 1% as described in Japanese Patent Application No. 8-264183.
  • Ge is also preferably added in the form of GeO 2.
  • the light wave controlling material may be a linear material such as an optical fiber or a flat material. In the case of an optical fiber, it is possible to impart optical nonlinearity to the core by adding Ge to the core. Then, using the electrode used for UV excitation poling as it is, By applying a predetermined electric field to the core portion, the characteristics of the core portion can be changed, and optical switching and the like can be performed.
  • the light wave controlling material of the present invention can be used for optical functional devices such as an optical switch and a wavelength switch.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

Cette invention se rapporte à un procédé de production d'un matériau de régulation des ondes lumineuses, qui consiste à préparer (S11) un matériau vitreux tel que du SiO2 dopé par Ge, à traiter à chaud (S12) ce matériau dans une atmosphère sous vide, afin de libérer l'oxygène contenu dans le matériau, et à augmenter les défauts déficients en oxygène présents dans le matériau, puis à procéder (S13) à un maclage excité par ultraviolets, pour que les défauts déficients en oxygène soient convertis en centres de GeE', afin de former un matériau de régulation des ondes lumineuses présentant une non-linéarité lumineuse de second ordre. Ainsi, ce procédé peut former un matériau de régulation des ondes lumineuses possédant une constante d'effet optique non linéaire (d) supérieure à 5 pm/V à partir d'un matériau vitreux à base de SiO2.
PCT/JP1998/005176 1998-03-16 1998-11-18 Procede de production d'un materiau de regulation des ondes lumineuses et materiau de regulation des ondes lumineuses ainsi produit WO1999047973A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11728/99A AU1172899A (en) 1998-03-16 1998-11-18 Process for producing light wave control material and light wave control material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/65851 1998-03-16
JP10065851A JPH11258643A (ja) 1998-03-16 1998-03-16 光波制御材料の製造方法及び光波制御材料

Publications (1)

Publication Number Publication Date
WO1999047973A1 true WO1999047973A1 (fr) 1999-09-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1998/005176 WO1999047973A1 (fr) 1998-03-16 1998-11-18 Procede de production d'un materiau de regulation des ondes lumineuses et materiau de regulation des ondes lumineuses ainsi produit

Country Status (3)

Country Link
JP (1) JPH11258643A (fr)
AU (1) AU1172899A (fr)
WO (1) WO1999047973A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07244210A (ja) * 1994-01-14 1995-09-19 Sumitomo Electric Ind Ltd 光導波路型回折格子の作製方法及びその作製用光導波路
JPH10161164A (ja) * 1996-12-04 1998-06-19 Hitachi Cable Ltd 非線形光学素子及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07244210A (ja) * 1994-01-14 1995-09-19 Sumitomo Electric Ind Ltd 光導波路型回折格子の作製方法及びその作製用光導波路
JPH10161164A (ja) * 1996-12-04 1998-06-19 Hitachi Cable Ltd 非線形光学素子及びその製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FUJIWARA T., ET AL.: "OPTICAL FIBER GRATINGS - PHOTOSENSITIVITY AND OPTICAL NONLINEARITY IN GLASS MATERIALS.", BUNKO KENKYU - JOURNAL OF THE SPECTROSCOPICAL SOCIETY OF JAPAN, NIPPON BUNKO GAKKAI, TOKYO,, JP, vol. 45., no. 06., 1 January 1996 (1996-01-01), JP, pages 292 - 304., XP002920106, ISSN: 0038-7002 *
HIRAMA T., ET AL.: "HIGHLY ACTIVE SECOND-ORDER NONLINEARITY FROM SOL-GEL PROCESSED POLED SILICA AND GERMONOSILICATE THIN FILM.", OPTICAL REVIEW., SPRINGER VERLAG, TOKYO., JP, vol. 03., no. 01., 1 January 1996 (1996-01-01), JP, pages 17/18., XP002920105, ISSN: 1340-6000, DOI: 10.1007/s10043-996-0017-6 *

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Publication number Publication date
AU1172899A (en) 1999-10-11
JPH11258643A (ja) 1999-09-24

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