| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Hybrid chirped pulse amplification system | US10304262 | 2002-11-26 | US06873454B2 | 2005-03-29 | Christopher P. J. Barty; Igor Jovanovic |
| A hybrid chirped pulse amplification system wherein a short-pulse oscillator generates an oscillator pulse. The oscillator pulse is stretched to produce a stretched oscillator seed pulse. A pump laser generates a pump laser pulse. The stretched oscillator seed pulse and the pump laser pulse are directed into an optical parametric amplifier producing an optical parametric amplifier output amplified signal pulse and an optical parametric amplifier output unconverted pump pulse. The optical parametric amplifier output amplified signal pulse and the optical parametric amplifier output laser pulse are directed into a laser amplifier producing a laser amplifier output pulse. The laser amplifier output pulse is compressed to produce a recompressed hybrid chirped pulse amplification pulse. | ||||||
| 142 | Lithium tantalate substrate and method of manufacturing same | US10819472 | 2004-04-06 | US20040255842A1 | 2004-12-23 | Tomio Kajigaya; Takashi Kakuta |
| In a process for manufacturing a LT substrate from a LT crystal, after growing the crystal, a LT substrate in ingot form is imbedded in carbon power, or is place in a carbon vessel, and heat treated is conducted at a maintained temperature of between 650null C. and 1650null C. for at least 4 hours, whereby in a lithium tantalate (LT) substrate, sparks are prevented from being generated by the charge up of an electric charge on the substrate surface, and thereby destruction of a comb pattern formed on the substrate surface and breaks or the like in the LT substrate are prevented. | ||||||
| 143 | Novel method for creating frequency converters | US10455526 | 2003-06-06 | US20040246564A1 | 2004-12-09 | Chung-Pin Liao |
| A special nullstanding-laser-polingnull method for volumetric domain inversion of nonlinear ferroelectric media, such as LiNbO3, is provided. Using the combination of a short-wavelength, high-field laser standing wave pattern and a back ground electric field, a short-period bulk domain inversion pattern can be naturally engraved within the nonlinear media. | ||||||
| 144 | Ion exchange waveguides and methods of fabrication | US09419347 | 1999-10-15 | US06786967B1 | 2004-09-07 | Lee J. Burrows |
| A method for fabricating ion exchange waveguides, such as lithium niobate or lithium tantalate waveguides in optical modulators and other optical waveguide devices, utilizes pressurized annealing to further diffuse and limit exchange of the ions and includes ion exchanging the crystalline substrate with a source of ions and annealing the substrate by pressurizing a gas atmosphere containing the lithium niobate or lithium tantalate substrate above normal atmospheric pressure, heating the substrate to a temperature ranging from about 150 degrees Celsius to about 1000 degrees Celsius, maintaining pressure and temperature to effect greater ion diffusion and limit exchange, and cooling the structure to an ambient temperature at an appropriate ramp down rate. In another aspect of the invention a powder of the same chemical composition as the crystalline substrate is introduced into the anneal process chamber to limit the crystalline substrate from outgassing alkaline earth metal oxide during the anneal period. In yet another aspect of the invention an anneal container is provided that allows for crystalline substrates to be annealed in the presence of powder without contaminating the substrate with the powder during the anneal process. Waveguides manufactured in accordance with the method exhibit superior drift performance. | ||||||
| 145 | Polycrystalline ferroelectric optical devices | US09826528 | 2001-04-05 | US06694082B2 | 2004-02-17 | Harold Yoonsung Hwang; Markus J P Siegert |
| An optical device comprises a body of ferroelectric material exhibiting an effective electro-optic coefficient (reff) and an optical loss (&agr;), with the body being adapted for the propagation of optical radiation at a wavelength &lgr;o through it, and means for applying an electric field to the body in order to alter the refractive index therein, characterized in that the body is polycrystalline and has an average grain size such that reff is relatively high and &agr; is relatively low, both at &lgr;o. In a preferred embodiment the body has an average grain size that is less than about &lgr;o/10, preferably in the range of approximately 8-20 nm, which is especially well suited for devices operating at near infrared wavelengths in the range of about 1000-1600 nm. Illustratively, the ferroelectric body is a perovskite material such as barium titanate or lithium niobate. | ||||||
| 146 | Optically functional device, single crystal substrate for the device and method for its use | US09796594 | 2001-03-02 | US06624923B2 | 2003-09-23 | Yasunori Furukawa; Kenji Kitamura; Shunji Takekawa; Masaru Nakamura |
| An optically functional device comprising a ferroelectric single crystal substrate and polarization-inverted structures formed at portions of the substrate at a temperature of not higher than the Curie temperature by an electron beam scanning irradiation method or a voltage application method and designed to control light passed through the polarization-inverted portions, wherein a LiTaO3 crystal having a molar ratio of Li/Ta within a range of from 0.95 to 1.02, is used as the substrate, so that the propagation loss of light passed through the polarization-inverted portions immediately after formation of the polarization-inverted structures, is not more than 2%. | ||||||
| 147 | Hybrid chirped pulse amplification system | US10304262 | 2002-11-26 | US20030112494A1 | 2003-06-19 | Christopher P. J. Barty; Igor Jovanovic |
| A hybrid chirped pulse amplification system wherein a short-pulse oscillator generates an oscillator pulse. The oscillator pulse is stretched to produce a stretched oscillator seed pulse. A pump laser generates a pump laser pulse. The stretched oscillator seed pulse and the pump laser pulse are directed into an optical parametric amplifier producing an optical parametric amplifier output amplified signal pulse and an optical parametric amplifier output unconverted pump pulse. The optical parametric amplifier output amplified signal pulse and the optical parametric amplifier output laser pulse are directed into a laser amplifier producing a laser amplifier output pulse. The laser amplifier output pulse is compressed to produce a recompressed hybrid chirped pulse amplification pulse. | ||||||
| 148 | Electro-optic optical elements | US10102594 | 2002-03-19 | US06545791B1 | 2003-04-08 | Leon McCaughan; Thomas F. Kuech; Dovas A. Saulys; Vladimir A. Joshkin; Aref Chowdhury; Chad Matthew Staus |
| Electro-optic elements are formed in metal oxide films, such as lithium niobate, on a substrate such as lithium niobate for utilization in electro-optical devices. The electro-optic elements include trenches in the lithium niobate selected to improve the performance of the device. Traveling wave modulators may be formed with a waveguide having first and second arms, electrodes over the lithium niobate layer, and trenches formed in the layer to focus the electric field in the waveguide, resulting in improved modulator performance. | ||||||
| 149 | Thin film lithium niobate structure and method of making the same | US09761135 | 2001-01-16 | US06544431B2 | 2003-04-08 | Douglas M. Gill; Dale Conrad Jacobson |
| A method of forming thin film waveguide regions in lithium niobate uses an ion implant process to create an etch stop at a predetermined distance below the lithium niobate surface. Subsequent to the ion implantation, a heat treatment process is used to modify the etch rate of the implanted layer to be in the range of about 20 times slower than the bulk lithium niobate material. A conventional etch process (such as a wet chemical etch) can then be used to remove the virgin substrate material and will naturally stop when the implanted material is reached. By driving the ions only a shallow distance into the substrate, a backside etch can be used to remove most of the lithium niobate material and thus form an extremely thin film waveguide that is defined by the depth of the ion implant. Other structural features (e.g., ridge waveguides) may also be formed using this method. | ||||||
| 150 | Production method of light wavelength converting element | US09860489 | 2001-05-21 | US06529309B2 | 2003-03-04 | Akira Mizuyoshi |
| A light wavelength converting element having a periodic polarization inversion structure is produced in the following manner: a comb-shaped electrode and a plate electrode are attached to both surfaces of an MgO—LN substrate, and the MgO—LN substrate is immersed in an insulating liquid. In a state in which substrate temperature is at room temperature, the plate electrode is grounded and a pulse voltage of +0.75 kV, for example, is applied for one second such that the comb-shaped electrode has positive potential. Then, the comb-shaped electrode is grounded and a pulse voltage of −3.25 kV, for example, is applied for ten seconds such that the plate electrode has negative potential. | ||||||
| 151 | Method and apparatus for optical beam steering based on a chirped distributed bragg reflector | US09545633 | 2000-04-07 | US06441947B1 | 2002-08-27 | Stanislav I. Ionov |
| An optical beam steerer includes one or more layers of electro-optically active material in which is formed a chirped distributed Bragg reflector. An electric field generated across the electro-optically active material in the direction of propagation of the chirped distributed Bragg reflector causes the index of refraction within the material to change. The electric field varies in a direction normal to the direction of propagation of the chirped distributed Bragg reflector which causes a variation in the local index of refraction proportional to the strength of the electric field. Changes in the index of refraction cause the wavefront of the incident optical beam to experience different delays such that the incident optical beam is reflected out of the beam steerer at an angle that is tangential to the direction of variation of the applied electric field. Two dimensional beam steering is provided by the creation of two electric fields that are orthogonal to each other. Optical beam correction is provided by a matrix of individually addressable pixels that provide for individually controllable variations in the local index of refraction in the electro-optically active material. | ||||||
| 152 | Thin film lithium niobate structure and method of making the same | US09761135 | 2001-01-16 | US20020092823A1 | 2002-07-18 | Douglas M. Gill; Dale Conrad Jacobson |
| A method of forming thin film waveguide regions in lithium niobate uses an ion implant process to create an etch stop at a predetermined distance below the lithium niobate surface. Subsequent to the ion implantation, a heat treatment process is used to modify the etch rate of the implanted layer to be in the range of about 20 times slower than the bulk lithium niobate material. A conventional etch process (such as a wet chemical etch) can then be used to remove the virgin substrate material and will naturally stop when the implanted material is reached. By driving the ions only a shallow distance into the substrate, a backside etch can be used to remove most of the lithium niobate material and thus form an extremely thin film waveguide that is defined by the depth of the ion implant. Other structural features (e.g., ridge waveguides) may also be formed using this method. | ||||||
| 153 | Optically functional device, single crystal substrate for the device and method for its use | US09796594 | 2001-03-02 | US20020033993A1 | 2002-03-21 | Yasunori Furukawa; Kenji Kitamura; Shunji Takekawa; Masaru Nakamura |
| An optically functional device comprising a ferroelectric single crystal substrate and polarization-inverted structures formed at portions of the substrate at a temperature of not higher than the Curie temperature by an electron beam scanning irradiation method or a voltage application method and designed to control light passed through the polarization-inverted portions, wherein a LiTaO3 crystal having a molar ratio of Li/Ta within a range of from 0.95 to 1.02, is used as the substrate, so that the propagation loss of light passed through the polarization-inverted portions immediately after formation of the polarization-inverted structures, is not more than 2%. | ||||||
| 154 | Versatile electro-optical polarization controller | US09775162 | 2001-01-31 | US20020015548A1 | 2002-02-07 | Pisu Jiang |
| A polarization device is disclosed that provides versatility in achieving a desired polarization state of an optical signal. Current polarization controllers are provided with two or three control sections to induce null/4 or null/2 changes in the received optical signal. However, once designed, those controller have a fixed polarization mode of operation. The electro-optical polarization controller disclosed comprises a lithium niobate substrate having an optical waveguide for propagation of an optical signal with separate first, second, third and fourth control sections sequentially formed in cascaded fashion along the length of the waveguide. Each control section is provided with driver electrodes arranged to be driven with suitable electrical control signals to induce electro-optical birefringence in the waveguide along its respective control section length of the optical waveguide. More than four sections can be utilized in cascade along the waveguide to achieve better birefringence control of the optical signal. | ||||||
| 155 | Guided wave electrooptic and acoustooptic tunable filter apparatus and method | US09737206 | 2000-12-14 | US20010038728A1 | 2001-11-08 | Henry F. Taylor; Ohannes Eknoyan |
| A two-port guided wave tunable filter in a birefringent electrooptic and/or acoustooptic substrate material includes two 3-port, symmetric Y-branch beam splitters connected by two waveguide sections in which phase-matched polarization coupling occurs, with an input port and an output port. The optical path difference between the beam splitters is half an optical wavelength, and the polarization coupling regions between the beam splitters are relatively displaced by an odd integral multiple of half the spatial period of the perturbation responsible for the coupling. In one embodiment, an electrooptic tunable filter, the polarization coupling in the waveguides is caused by a spatially periodic strain-inducing film and tuning results from an applied electric field. In another embodiment, an acoustooptic tunable filter, polarization coupling results from a surface acoustic wave and tuning is accomplished by changing the acoustic frequency. Alternatively, four port electrooptic and acoustooptic tunable filters are formed by replacing the 3-port beam splitters with 4-port directional couplers, where in each of the directional couplers the splitting ratio for TE input polarization plus the splitting ratio for TM input polarization is substantially equal to one. | ||||||
| 156 | Optical waveguide device with enhanced stability | US09287683 | 1999-04-07 | US06282356B1 | 2001-08-28 | Wilbur Dexter Johnston, Jr.; William James Minford; John William Osenbach |
| The invention is an optical waveguide device and a method for forming the device which provides enhanced stability. The device includes a pyroelectric substrate such as lithium niobate where the bulk resistivity of at least a portion of the substrate is reduced to 1013 ohm cm or less by heating the substrate in a reducing atmosphere. This causes the substrate to be less susceptible to temperature variants which can otherwise result in dc bias drift and variation. | ||||||
| 157 | Semiconductor optical modulator and integrated optical circuit device | US104985 | 1998-06-26 | US6115169A | 2000-09-05 | Kazuhisa Takagi; Syoichi Kakimoto |
| A semiconductor optical modulator which, with a relatively simple configuration, eliminates phase modulation of output light from the semiconductor optical modulator by applying a voltage to a light absorption layer on the modulator. A nonlinear optical material layer changing refractive index is located in the direction of light propagation and cancels, in the output light, the phase modulation that is generated due to light intensity variations in the light absorption layer. | ||||||
| 158 | Iron-doped lithium niobate single crystal, method for heat treatment thereof and hologram-application element containing the single crystal | US778273 | 1997-01-02 | US5904912A | 1999-05-18 | Kenji Kitamura; Yasunori Furukawa; Nobuo Ii; Shigeyuki Kimura |
| An iron-doped lithium niobate single crystal having a molar fraction of Li.sub.2 O/(Nb.sub.2 O.sub.5 +Li.sub.2 O) of from 0.495 to 0.50 which is closer to the stoichiometrical composition than a usual congruent composition, and a high diffraction efficiency by a two light wave mixture. | ||||||
| 159 | Method of electrically controlling regions of ferroelectric polarization domains in solid state bodies | US241788 | 1994-05-12 | US5838702A | 1998-11-17 | Robert L. Byer; Martin M. Fejer; Eric J. Lim |
| Chemical and electrical poling is described, as well as an improved optical converter having a solid state body which employs the same. | ||||||
| 160 | Method of making optical wavelength converting device | US548035 | 1995-10-25 | US5836073A | 1998-11-17 | Kiminori Mizuuchi; Kazuhisa Yamamoto; Hisanao Sato |
| An optical wavelength converting device is provided with a LiTaO.sub.3 substrate, a plurality of inverted-polarization layers periodically arranged in an upper surface of the LiTaO.sub.3 substrate, and an optical waveguide crossing the inverted-polarization layers. The upper surface of the LiTaO.sub.3 substrate is directed toward a -X-crystal axis direction. The inverted-polarization layers are formed by exchanging Ta.sup.+ ions of the LiTaO.sub.3 substrate for H.sup.+ ions, and an extending direction of each inverted-polarization layer is inclined at an angle of .theta. degrees (6.ltoreq..theta..ltoreq.174) to the +C-crystal axis direction toward a -Y-crystal axis direction. The optical waveguide is formed by exchanging Ta.sup.+ ions of the LiTaO.sub.3 substrate and the inverted-polarization layers for H.sup.+ ions to set a refractive index of the optical waveguide higher than that of the LiTaO.sub.3 substrate. The optical waveguide extends in a +Y-crystal axis direction. Fundamental waves polarized in a transverse electric mode induce electric field directed in .+-.Y-crystal axis directions and are converted into second harmonic waves in the optical waveguide. | ||||||
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