Patents by Inventor Pietari Tuomisto
Pietari Tuomisto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11747621Abstract: Reflectors comprising thin film dichroic coatings are located on various components of a waveguide-based optical combiner in a see-through display of a head-mounted display (HMD) device to reduce color cross-coupling in holographic images and reflect forward-projected holographic image light back to a user's eye. The dichroic coatings implement narrowband reflectors for each of one or more colors of an RGB (red, green, blue) color model over the angular range associated with the field of view (FOV) of the virtual portion of the see-through display. Utilization of the dichroic coatings can improve virtual display uniformity and lessen sharp edge defects by reducing cross-coupling and may also improve light security by reducing the forward-projected holographic image light that escapes from the HMD device.Type: GrantFiled: November 7, 2020Date of Patent: September 5, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Tuomas Heikki Sakari Vallius, Pietari Tuomisto, Jani Kari Tapio Tervo
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Publication number: 20220360047Abstract: A laser chip is described which comprises a plurality of gain areas. Each gain area comprises a ridge waveguide and a wavelength locking element, where the wavelength locking element in a gain area defines the output wavelength characteristics of visible light emitted from that gain area and adjacent gain areas comprise different wavelength locking elements.Type: ApplicationFiled: May 6, 2021Publication date: November 10, 2022Inventors: Pasi Petteri PIETILAE, Pietari TUOMISTO, Simo Kaarlo Tapani TAMMELA
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Publication number: 20220146827Abstract: Reflectors comprising thin film dichroic coatings are located on various components of a waveguide-based optical combiner in a see-through display of a head-mounted display (HMD) device to reduce color cross-coupling in holographic images and reflect forward-projected holographic image light back to a user's eye. The dichroic coatings implement narrowband reflectors for each of one or more colors of an RGB (red, green, blue) color model over the angular range associated with the field of view (FOV) of the virtual portion of the see-through display. Utilization of the dichroic coatings can improve virtual display uniformity and lessen sharp edge defects by reducing cross-coupling and may also improve light security by reducing the forward-projected holographic image light that escapes from the HMD device.Type: ApplicationFiled: November 7, 2020Publication date: May 12, 2022Inventors: Tuomas Heikki Sakari VALLIUS, Pietari TUOMISTO, Jani Kari Tapio TERVO
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Patent number: 11175509Abstract: The description relate to devices, such as augmented reality and/or virtual reality devices that employ optical waveguides. On example includes a first optical waveguide configured to receive light at an incidence angle and a second optical waveguide positioned in a non-parallel relation to the first optical waveguide. The second optical waveguide can be configured to receive the light through the first optical waveguide at a first location at the incidence angle, transmit the light within the second optical waveguide, and output the light from a second location back toward the first optical waveguide at the incidence angle.Type: GrantFiled: September 30, 2019Date of Patent: November 16, 2021Assignee: Microsoft Technology Licensing, LLCInventors: Simo Kaarlo Tammela, Ari Juhani Tervonen, Heikki Juhana Hyvarinen, Lasse Pekka Karvonen, Andreas Langner, Pietari Tuomisto
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Publication number: 20210096371Abstract: The description relate to devices, such as augmented reality and/or virtual reality devices that employ optical waveguides. On example includes a first optical waveguide configured to receive light at an incidence angle and a second optical waveguide positioned in a non-parallel relation to the first optical waveguide. The second optical waveguide can be configured to receive the light through the first optical waveguide at a first location at the incidence angle, transmit the light within the second optical waveguide, and output the light from a second location back toward the first optical waveguide at the incidence angle.Type: ApplicationFiled: September 30, 2019Publication date: April 1, 2021Applicant: Microsoft Technology Licensing, LLCInventors: Simo Kaarlo Tammela, Ari Juhani Tervonen, Heikki Juhana Hyvarinen, Lasse Pekka Karvonen, Andreas Langner, Pietari Tuomisto
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Patent number: 10866422Abstract: MicroLED arrays offer a small form factor solution for the HMD image sources since they do not need a separate illumination optics. Features of the present disclosure implement a MicroLED display system that incorporate a plurality of monochrome projectors (e.g., three MicroLED projectors) to generate three monochrome images (e.g., red, blue, and green images) that are separately input into a single waveguide of the HMD and combined to form an image that is displayed to the user. By utilizing a single waveguide that includes a plurality of spatially separated input regions (e.g., a region for inputting blue light, a region for inputting red light, a region for inputting green light), the MicroLED display system of the present disclosure may reduce the form factor of the HMD device because of the reduced number of plates that may be required to combine the three monochrome images.Type: GrantFiled: February 21, 2019Date of Patent: December 15, 2020Assignee: Microsoft Technology Licensing, LLCInventors: Pietari Tuomisto, William Cummings, Dmitry Reshidko, Tuomas Vallius, David Douglas Bohn
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Publication number: 20200271932Abstract: MicroLED arrays offer a small form factor solution for the HMD image sources since they do not need a separate illumination optics. Features of the present disclosure implement a MicroLED display system that incorporate a plurality of monochrome projectors (e.g., three MicroLED projectors) to generate three monochrome images (e.g., red, blue, and green images) that are separately input into a single waveguide of the HMD and combined to form an image that is displayed to the user. By utilizing a single waveguide that includes a plurality of spatially separated input regions (e.g., a region for inputting blue light, a region for inputting red light, a region for inputting green light), the MicroLED display system of the present disclosure may reduce the form factor of the HMD device because of the reduced number of plates that may be required to combine the three monochrome images.Type: ApplicationFiled: February 21, 2019Publication date: August 27, 2020Inventors: Pietari TUOMISTO, William J. CUMMINGS, Dmitry RESHIDKO, Tuomas VALLIUS, David Douglas BOHN
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Patent number: 10650785Abstract: MicroLED arrays offer a small form factor solution for the HMD image sources since they do not need a separate illumination optics. Features of the present disclosure implement a MicroLED display system that incorporate a plurality of monochrome projectors (e.g., three MicroLED projectors) to generate three monochrome images (e.g., red, blue, and green images) that are separately input into a single waveguide of the HMD and combined to form an image that is displayed to the user. By utilizing a single waveguide that includes a plurality of spatially separated input regions (e.g., a region for inputting blue light, a region for inputting red light, a region for inputting green light), the MicroLED display system of the present disclosure may reduce the form factor of the HMD device because of the reduced number of plates that may be required to combine the three monochrome images.Type: GrantFiled: February 21, 2019Date of Patent: May 12, 2020Assignee: MICROSOFT TECHNOLOGY LICENSING, LLCInventors: Pietari Tuomisto, William J. Cummings, Dmitry Reshidko, Tuomas Vallius, David Douglas Bohn
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Publication number: 20130314766Abstract: A nonlinear crystal includes a plurality of poled zones implemented in a nonlinear material. The crystal has a first region and a second region. In the first region, the local average of a length of a period of the poled zones substantially increases with increasing distance from an origin. In the second region, the local average of the length of the period of the poled zones substantially decreases with increasing distance from the origin. The origin is located at an end of the crystal.Type: ApplicationFiled: December 1, 2011Publication date: November 28, 2013Applicant: EpiCrystals OyInventors: Tuomas Vallius, Janne Konttinen, Pietari Tuomisto
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Patent number: 8264765Abstract: A light source including a light emitting unit, a nonlinear medium, and a resonant grating. The light emitting unit is arranged to emit a first light into the nonlinear medium. The nonlinear medium is arranged to generate a second light such that an optical frequency of the second light is higher than an optical frequency of the first light. The resonant grating is arranged to stabilize an optical frequency of the first light by providing optical feedback to the light emitting unit.Type: GrantFiled: August 31, 2010Date of Patent: September 11, 2012Assignee: EpiCrystals OyInventors: Tuomas Vallius, Pietari Tuomisto, Janne Konttinen
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Patent number: 7944958Abstract: A light emitting device including a waveguide having an electrically pumped gain region, a saturable absorber, a nonlinear crystal, an inclined mirror, and a light-concentrating structure. Light pulses emitted from the gain region are reflected by the inclined mirror and focused by the light-concentrating structure into the nonlinear crystal in order to generate frequency-converted light pulses. The gain region, the saturable absorber, the light-concentrating structure and the inclined mirror are implemented on or in a common substrate. The resulting structure is stable and compact, and allows on-wafer testing of produced emitters. The folded structure allows easy alignment of the nonlinear crystal.Type: GrantFiled: January 17, 2008Date of Patent: May 17, 2011Assignee: EpiCrystals OyInventors: Janne Konttinen, Pietari Tuomisto, Tomi Jouhti
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Publication number: 20110051226Abstract: A light source including a light emitting unit, a nonlinear medium, and a resonant grating. The light emitting unit is arranged to emit a first light into the nonlinear medium. The nonlinear medium is arranged to generate a second light such that an optical frequency of the second light is higher than an optical frequency of the first light. The resonant grating is arranged to stabilize an optical frequency of the first light by providing optical feedback to the light emitting unit.Type: ApplicationFiled: August 31, 2010Publication date: March 3, 2011Applicant: EpiCrystals OyInventors: Tuomas VALLIUS, Pietari Tuomisto, Janne Konttinen
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Publication number: 20100142570Abstract: A light emitting device including a waveguide having an electrically pumped gain region, a saturable absorber, a nonlinear crystal, an inclined mirror, and a light-concentrating structure. Light pulses emitted from the gain region are reflected by the inclined minor and focused by the light-concentrating structure into the nonlinear crystal in order to generate frequency-converted light pulses. The gain region, the saturable absorber, the light-concentrating structure and the inclined minor are implemented on or in a common substrate. The resulting structure is stable and compact, and allows on-wafer testing of produced emitters. The folded structure allows easy alignment of the nonlinear crystal.Type: ApplicationFiled: January 17, 2008Publication date: June 10, 2010Applicant: EpiCrystals OyInventors: Janne Konttinen, Pietari Tuomisto, Tomi Jouhti
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Patent number: 7660500Abstract: A light emitting device including an array of light emitters to emit first light pulses. Each of the light emitters includes a saturable absorber and a waveguide having an electrically pumped gain region to emit the first light pulses. At least one reflector structure reflects the first light pulses into a nonlinear crystal by changing the direction of the first light pulses by an angle that is in a range of 70 to 110 degrees. The reflector structure includes a sub-wavelength grating structure to change the polarization of the first light pulses. A nonlinear crystal generates second light pulses such that the optical frequency of the second light pulses is two times the optical frequency of the first light pulses.Type: GrantFiled: May 22, 2007Date of Patent: February 9, 2010Assignee: EpiCrystals OyInventors: Janne Konttinen, Tomi Jouhti, Pietari Tuomisto
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Publication number: 20080291951Abstract: A light emitting device including an array of light emitters to emit first light pulses. Each of the light emitters includes a saturable absorber and a waveguide having an electrically pumped gain region to emit the first light pulses. At least one reflector structure reflects the first light pulses into a nonlinear crystal by changing the direction of the first light pulses by an angle that is in a range of 70 to 110 degrees. The reflector structure includes a sub-wavelength grating structure to change the polarization of the first light pulses. A nonlinear crystal generates second light pulses such that the optical frequency of the second light pulses is two times the optical frequency of the first light pulses.Type: ApplicationFiled: May 22, 2007Publication date: November 27, 2008Applicant: EpiCrystals OyInventors: Janne Konttinen, Tomi Jouhti, Pietari Tuomisto
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Publication number: 20080175284Abstract: A light emitting device comprises a waveguide having an electrically pumped gain region, a nonlinear medium, and an inclined mirror. Light pulses emitted from the gain region are reflected by the inclined mirror into the nonlinear medium in order to generate frequency-doubled light pulses. The gain region and the inclined mirror are implemented on the same substrate. The resulting structure is stable and compact, and allows on-wafer testing of produced emitters. The folded structure allows easy alignment of the nonlinear crystal.Type: ApplicationFiled: January 18, 2007Publication date: July 24, 2008Applicant: EpiCrystals OyInventors: Janne Konttinen, Pietari Tuomisto, Tomi Jouhti
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Patent number: 7394841Abstract: A light emitting device comprises a waveguide having an electrically pumped gain region, a nonlinear medium, and an inclined mirror. Light pulses emitted from the gain region are reflected by the inclined mirror into the nonlinear medium in order to generate frequency-doubled light pulses. The gain region and the inclined mirror are implemented on the same substrate. The resulting structure is stable and compact, and allows on-wafer testing of produced emitters. The folded structure allows easy alignment of the nonlinear crystal.Type: GrantFiled: January 18, 2007Date of Patent: July 1, 2008Assignee: EpiCrystals OyInventors: Janne Konttinen, Pietari Tuomisto, Tomi Jouhti