WO1998014827A1 - Materiau en verre de silice ayant une non-linearite optique de second ordre et son procede de fabrication - Google Patents
Materiau en verre de silice ayant une non-linearite optique de second ordre et son procede de fabrication Download PDFInfo
- Publication number
- WO1998014827A1 WO1998014827A1 PCT/JP1997/003470 JP9703470W WO9814827A1 WO 1998014827 A1 WO1998014827 A1 WO 1998014827A1 JP 9703470 W JP9703470 W JP 9703470W WO 9814827 A1 WO9814827 A1 WO 9814827A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass material
- optical nonlinearity
- optical
- concentration
- nonlinearity
- Prior art date
Links
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
- G02F1/37—Non-linear optics for second-harmonic generation
- G02F1/377—Non-linear optics for second-harmonic generation in an optical waveguide structure
- G02F1/383—Non-linear optics for second-harmonic generation in an optical waveguide structure of the optical fibre type
-
- 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
-
- 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 silica-based glass material having second-order optical nonlinearity and a method for producing the same.
- the present invention relates to a SiO 2 (silica) -based glass material having second-order optical nonlinearity and a method for producing the same, particularly to a content of Ge (germanium).
- WO 96/16634 proposes imparting secondary optical nonlinearity to a Si ⁇ 2-based glass material by ultraviolet excitation poling.
- Ge is 12 moles. / 0 to S i ⁇ 2 glass material obtained by adding, 8 X 1 0 5 V / cm with ultraviolet-excited poling while applying an electric field, the secondary light of 6 pm / V in the size of the electro-optic coefficient r It is described that nonlinearity can be given. Note that the scope of the claims of the publication, as the magnitude of the electric field upon ultraviolet excitation port one ring, 1 0 4 numerical value of ⁇ 1 0 7 VZ cm and is raised, 8 X 1 0 5 in the embodiment V / cm has been adopted.
- n a refractive index
- d (1/2)% (2) .
- Table 1 shows the measured values of r and d measured for various nonlinear optical materials (oxides), and the values of d t calculated from the measured relations using the above relational expressions. From this table, it is understood that the measured values and the calculated values do not always match. Table 1 is based on data from A. Yariv and P. Yeh, "Optical Waves in Crystals” (John Wiley & Sons, New York) p.230, P.513, etc. The sign is not taken into account.
- d is the nonlinear response in the frequency ( ⁇ TH z) domain of light
- r is a nonlinear response in the DC region.
- Equation (2) was derived empirically: Using this equation (2), a d constant that is relatively consistent with the measured value can be obtained.
- the applied electric field upon ultraviolet excitation bowling that actually used in the above publication is 8 X 1 0 5 VZ cm. Breakdown in G e added S i 0 2 based glass, because it is occurring in about 1 0 6 VZc m, the electric field is less margin, may cause personal cause breakdown: Accordingly, comprising the applied electric field vector There are also demands to lower it:
- the present invention has been made in view of the above problems, and has an electro-optic coefficient equivalent to that of a crystalline material, LiNbO, and has a large optical nonlinearity that can be substituted for a practical crystalline material. It is an object of the present invention to provide a SiO 2 -based glass material having the following and to provide a manufacturing method therefor. It is another object of the present invention to obtain a material having sufficient second-order optical nonlinearity by ultraviolet excitation polling with a relatively low applied electric field.
- the present invention is a Si 2 glass material including a portion having secondary optical nonlinearity, wherein the Ge concentration of the portion having secondary optical nonlinearity is 12 mol. /. Over 30 mol% and the magnitude of the second-order optical nonlinearity is 2.5 pm / V or more as the nonlinear optical constant d. It is characterized by being.
- the present invention provides the above material, wherein the Ge concentration is 15 mol. And wherein the / is 0 or more - Further, the present invention provides the above materials, S I_ ⁇ 2 based glass material is optical fiber or a planar waveguide, a portion having a second-order optical nonlinearity or optical fiber It is characterized by being a core of a planar waveguide.
- the present invention provides a manufacturing method of the S I_ ⁇ 2 glass material containing the site having second-order optical non-linearity, the region G e concentration is less 3 0 mole% more than 1 2 mol% S I_ ⁇ prepare 2 glass material, ultraviolet subjected to ultraviolet excitation port one ring process of irradiating while applying an electric field to the site, Yotsute thereto, to impart second order nonlinearity to the site containing It has second-order optical nonlinearity.
- the Ge concentration is 15 mol% or more.
- the size of the field is 1 X 1 0 5 VZc m or more, and less than 8 X 1 0 5 V / cm .
- FIG. 1 is a front sectional view showing the configuration of the embodiment.
- FIG. 2 is a side sectional view showing the configuration of the embodiment.
- FIG. 3 is a diagram showing the relationship between the applied electric field and the generated optical nonlinearity.
- FIG. 4 is a diagram showing the relationship between the Ge concentration and the optical non-linearity developed.
- Fig. 5 is a perspective view showing the configuration of the device used in the experiment.
- FIG. 6 is a schematic front view of the apparatus used for the experiment. [Best Mode for Carrying Out the Invention]
- the optical fiber 10 has a configuration in which silica glass (Sio 2 ) is stretched in a cylindrical shape, and is doped with Ge (germanium) or the like, and has a refractive index-adjusted central portion for the optical conduction core portion. 10a, the periphery is formed as cladding 10b:
- a pair of side holes 12a and 12b are formed in the clad portion 10b, and electrodes 14a and 14b made of an aluminum wire are inserted and arranged here. As is clear from the figure, the electrodes 14a and 14b are provided to face each other with the core 10a interposed therebetween.
- the core portion 10a is formed such that the magnitude of the second-order optical nonlinearity is 2.5 pm / V or more.
- the Ge concentration of the core 10a is set to exceed 12 mol%. That is, by setting the Ge concentration as described above, the magnitude of the second-order optical nonlinearity imparted by the ultraviolet light poling can be increased to 2.5 pm / V or more.
- the Ge concentration of the core portion 10a is set to 30 mol% or less so that the optical fiber 10 can be drawn.
- Such a grating element is manufactured as follows.
- C an optical fiber having electrodes 144, 14b inserted in side holes 12a, 12b is prepared.
- the center of the optical fiber carbonochloridate 1 0 is greater than G e force S 1 2 mole 0/0, is added to be less than 3 0 mol 0/0.
- the optical fiber 10 is formed by, for example, forming a core-corresponding portion by changing the amount of Ge added when sequentially forming the preform, and then drawing the core in a heated state.
- the diameter of the optical fiber 10 is 200 ⁇ m
- the diameter of the side holes 12 a and 12 b and the electrodes 14 a and 14 b is approximately 40 ⁇ m
- the length of the electrodes 14 a and 14 b Is about 4 cm
- the distance between the electrodes 14a and 14b is 8 to 10 ⁇ m
- the length of the optical fiber is about 10 cm.
- the electrodes 14a and 14b are inserted into the side holes 12a and 12b from different ends as shown in FIG. 1, and the ends protrude only in different directions. .
- a high electric field can be applied to the core 10a.
- a voltage is applied between the electrodes 14a and 14b. This voltage should be about 700-8 OOV.
- an electric field of 1 ⁇ 10 5 to 8 ⁇ 10 5 V / cm is applied to the core 10 a.
- an ArF excimer laser (wavelength: 1933 nm) is irradiated as a pulse, and the core 10a is irradiated with ultraviolet light.
- the Ge concentration in the core portion 10a is set to exceed 12 mol%. This is due to the following reason: According to the study of the present inventors, in UV-excited poling, as the magnitude of the applied electric field increases, the optical nonlinearity that develops increases. However, as shown in Fig. 3, when the electric field is increased to a certain extent, the effect is saturated, and the optical nonlinearity that appears does not increase further.
- the magnitude of the electric field that saturates this optical nonlinearity depends on the Ge concentration. In other words, the higher the Ge concentration, the more the non-linearity developed in a low electric field is saturated. In G e concentration 1 2 mole 0/0, a field 1 0 6 V / cm, not yet saturated, considered necessary higher fields. However, breakdown of the application of a higher than 1 0 6 VZc m field material (S i 0 2 glass) occurs. Therefore, there is a demand that the applied electric field be less than this. In the past, there was no recognition of such a relationship, so that an attempt was made to give as large an optical nonlinearity as possible by applying an electric field as high as possible. It is characterized by giving the material maximum optical nonlinearity. The materials described in the gazettes described in the section of the conventional example have not yet saturated optical nonlinearity, and therefore do not have sufficient optical nonlinearity.
- the Ge concentration is 30 mol. / 0 If more than, drawing the optical fiber shall be the core S i 0 2 glass containing G e becomes difficult. Therefore, the Ge concentration is 30 molar. / 0 or less is preferable.
- optical nonlinearity is given to the core 10 a of the optical fiber 10.
- the characteristics of the core 10a can be changed, and optical switching and the like can be performed.
- a portion in which optical nonlinearity is repeatedly provided at a predetermined interval in the core portion 10a is formed.
- the optical fiber with an electrode of the present invention is characterized in that It is also preferable to draw the electrodes together with the glass material as shown in Japanese Patent Application No. 8-244964.
- G e is also preferably added in the form of G E_ ⁇ 2.
- a test bead 20 made of SiO 2 glass having a size l OX l OX l mm shown in FIG. 5 was prepared. This test piece 20 has a Ge concentration of 15 mol. C which is / 0
- the test piece 20 is formed with a pair of electrode guide grooves 22 a and 22 b each having a width of 0.2 mm (size 10 mm): and a pair of electrode guide grooves.
- a pair of electrode plates 24a, 24b (made of aluminum) are inserted into the grooves 22a, 22b, and a predetermined voltage is applied between the pair of electrode plates 24a, 24b to form the electrodes 24a, 24b.
- a predetermined electric field was applied to the glass material existing between, 24b.
- the distance between the pair of electrode plates 24a and 24b was set to 1 mm.
- the test piece 20 was placed on a surface plate 30 made of an insulating material.
- the test piece 20 was placed, and the periphery of the four sides of the test piece 20 was covered with insulating grease.
- the electrode plate 24b inserted from below was inserted through a slit provided on the surface plate 30, and the electrode plates 24a and 24b inserted from below were fixed with an elastic adhesive 34. Note that a planar waveguide can be easily obtained by using such a material.
- the Ge concentration was 15 mol. In / 0 S i 0 2 system glass, optical nonlinearity is almost saturated at the electric field IX 1 0 5 V / cm. In this figure, the Ge concentration is 12 mol. /.
- the results of the ultraviolet light polling are also shown. In the conventional example, it can be seen that the developed optical nonlinearity is smaller than that of the present invention despite the application of a high electric field.
- FIG. 4 shows a plot of the saturation value of the optical nonlinearity against the Ge concentration.
- the magnitude of the optical nonlinearity increases with the magnitude of the Ge concentration.
- the Ge concentration is low, it is considered that the optical nonlinearity that has yet to be exhibited is not saturated even when a high electric field of 8 ⁇ 10 5 VZcm is applied.
- the present invention by setting the Ge concentration of the SiO 2 -based glass material to a relatively high concentration, even if the applied electric field in the ultraviolet excitation poling is relatively low, sufficient light can be obtained. Non-linearity can be exhibited. Therefore, dielectric breakdown can be reliably prevented, and optical nonlinearity equivalent to that of a crystalline material can be obtained.
- optical switches In information transmission systems using light such as optical fibers.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Glass Compositions (AREA)
- Optical Integrated Circuits (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU43225/97A AU727979B2 (en) | 1996-10-04 | 1997-09-29 | Silica-bassed glass material having second-order optical non-linearity and method for manufacturing the same |
EP97941273A EP0932074A4 (en) | 1996-10-04 | 1997-09-29 | SILICA GLASS MATERIAL HAVING SECOND ORDER OPTICAL NON-LINEARITY AND MANUFACTURING METHOD THEREOF |
CA002267861A CA2267861C (en) | 1996-10-04 | 1997-09-29 | Silica glass material having second order optical nonlinearity and its manufacturing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8/264183 | 1996-10-04 | ||
JP8264183A JPH10111526A (ja) | 1996-10-04 | 1996-10-04 | 2次光非線形性を有するシリカ系ガラス材料及びその製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998014827A1 true WO1998014827A1 (fr) | 1998-04-09 |
Family
ID=17399630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/003470 WO1998014827A1 (fr) | 1996-10-04 | 1997-09-29 | Materiau en verre de silice ayant une non-linearite optique de second ordre et son procede de fabrication |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0932074A4 (ja) |
JP (1) | JPH10111526A (ja) |
KR (1) | KR20000048861A (ja) |
AU (1) | AU727979B2 (ja) |
CA (1) | CA2267861C (ja) |
WO (1) | WO1998014827A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6380109B1 (en) * | 1999-03-08 | 2002-04-30 | Shin-Etsu Chemical Co., Ltd. | Second-order nonlinear glass material |
KR100353418B1 (ko) * | 1999-03-11 | 2002-09-18 | 삼성전자 주식회사 | 내부에 격자가 형성된 어븀 첨가 광섬유 제조방법 및 그에 따라 제조된 광섬유를 이용한 광섬유 증폭기 |
US6466722B1 (en) | 1998-03-12 | 2002-10-15 | Toyota Jidosha Kabushiki Kaisha | Method of fabricating optical nonlinear thin film waveguide and optical nonlinear thin film waveguide |
CN111273393A (zh) * | 2020-03-30 | 2020-06-12 | 浙江师范大学 | 具有高二阶非线极化率的四芯光纤热极化结构 |
CN111273392A (zh) * | 2020-03-30 | 2020-06-12 | 浙江师范大学 | 基于热极化电场演变的新型光纤热极化结构 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3852213B2 (ja) | 1998-07-30 | 2006-11-29 | トヨタ自動車株式会社 | 非線形光学シリカ材料及び非線形光学素子 |
AUPR397701A0 (en) * | 2001-03-27 | 2001-04-26 | University Of Sydney, The | Method and apparatus for enhancing the non-linearity of arbitrary lengths of optical waveguide |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01217330A (ja) * | 1988-02-25 | 1989-08-30 | Furukawa Electric Co Ltd:The | 光ファイバ |
-
1996
- 1996-10-04 JP JP8264183A patent/JPH10111526A/ja active Pending
-
1997
- 1997-09-29 CA CA002267861A patent/CA2267861C/en not_active Expired - Fee Related
- 1997-09-29 EP EP97941273A patent/EP0932074A4/en not_active Withdrawn
- 1997-09-29 KR KR1019990702863A patent/KR20000048861A/ko not_active Application Discontinuation
- 1997-09-29 AU AU43225/97A patent/AU727979B2/en not_active Ceased
- 1997-09-29 WO PCT/JP1997/003470 patent/WO1998014827A1/ja not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01217330A (ja) * | 1988-02-25 | 1989-08-30 | Furukawa Electric Co Ltd:The | 光ファイバ |
Non-Patent Citations (4)
Title |
---|
ELECTRON. LETT., Vol. 31, No. 7, March 1995, T. FUJIWARA et al., "Electro-Optic Modulation in Germanosilicate Fibre with UV-Excited Poling", pages 573-575. * |
JOURNAL OF THE SPECTROSCOPICAL SOCIETY OF JAPAN, Vol. 45, No. 6, 1996, TAKUMI FUJIWARA, MASAHIDE TAKAHASHI, AKIRA IKUSHIMA, "Optical Fiber Grating Photorefractive Effect and Optical Nonlinearity of Glass Material (in Japanese)", pages 292-304. * |
OPTICS LETTERS, Vol. 13, No. 7, July 1988, M.V. BERGOT et al., "Generation of Permanent Optically Induced Second-Order Nonlinearities in Optical Fibers by Poling", pages 592-594. * |
See also references of EP0932074A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6466722B1 (en) | 1998-03-12 | 2002-10-15 | Toyota Jidosha Kabushiki Kaisha | Method of fabricating optical nonlinear thin film waveguide and optical nonlinear thin film waveguide |
US6380109B1 (en) * | 1999-03-08 | 2002-04-30 | Shin-Etsu Chemical Co., Ltd. | Second-order nonlinear glass material |
US6564585B2 (en) | 1999-03-08 | 2003-05-20 | Shin-Etsu Chemical Co., Ltd. | Method for producing a second-order nonlinear glass material |
KR100353418B1 (ko) * | 1999-03-11 | 2002-09-18 | 삼성전자 주식회사 | 내부에 격자가 형성된 어븀 첨가 광섬유 제조방법 및 그에 따라 제조된 광섬유를 이용한 광섬유 증폭기 |
CN111273393A (zh) * | 2020-03-30 | 2020-06-12 | 浙江师范大学 | 具有高二阶非线极化率的四芯光纤热极化结构 |
CN111273392A (zh) * | 2020-03-30 | 2020-06-12 | 浙江师范大学 | 基于热极化电场演变的新型光纤热极化结构 |
CN111273393B (zh) * | 2020-03-30 | 2024-01-26 | 浙江师范大学 | 具有高二阶非线极化率的四芯光纤热极化结构 |
Also Published As
Publication number | Publication date |
---|---|
AU4322597A (en) | 1998-04-24 |
JPH10111526A (ja) | 1998-04-28 |
CA2267861C (en) | 2002-08-20 |
AU727979B2 (en) | 2001-01-04 |
KR20000048861A (ko) | 2000-07-25 |
EP0932074A1 (en) | 1999-07-28 |
CA2267861A1 (en) | 1998-04-09 |
EP0932074A4 (en) | 2000-05-17 |
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