USA as Represented by Secretary of the Navy

Other

The University of North Carolina at Charlotte

Sunlight Photonics Inc.

The United States of America

Ishwar Dayal Aggarwal

Jasbinder Singh Sanghera

Shyam S Bayya

Guillermo R Villalobos

Leslie Brandon Shaw

Lynda E Busse

Woohong Kim

Jesse A Frantz

Vinh Q Nguyen

Pablo C Pureza

Frederic Hau Kung

Daniel Joseph Gibson

Barry B Harbison

Bryan Sadowski

L Brandon Shaw

Catalin M Florea

Rafael R Gattass

Peter Anthony Thielen

Brian A Cole

Michael Hunt

Reza Mossadegh

Brandon L Shaw

Colin C Baker

Kenneth J Ewing

Gregory Nau

Menelaos K Poutous

Sergey V Frolov

Allan James Bruce

Michael Cyrus

Jason D Myers

Geoffrey Chin

Robert E Miklos

John M Jewell

Robel Y Bekele

Celia I Merzbacher

Geoff Chin

Jas S Sanghera

Fred Kung

John A Moon

Benjamin Rock

Thomas Bilodeau

Lew Goldberg

Frank Bucholtz

Steven R Bowman

Michael L Dennis

Irwin Schneider

Edward J Friebele

Daniel L Rhonehouse

Dean A Scribner

Grant Lu

Kevin J Major

Jason Auxier

Rajesh Thapa

Ken Ewing

Guollermo R Villalobos

Guillermo E Villalobos

David Schaafsma

Paul Pureza

Cathy S Scotto

Paige L Higby

Daniel Brower

An antireflection optical element formed from an optical material. The optical material includes a first plurality of antireflective surface structures in the form of first protuberances from the optical material. The first plurality of antireflective surface structures are constructed to aid in transmission of a first wavelength range through the optical material. Also included are a second plurality of antireflective surface structures in the form second protuberances from the first plurality of antireflective surface structures. The second plurality of antireflective surface structures are constructed to aid in transmission a second wavelength range through the optical material. The first wavelength range comprises longer wavelengths than the second wavelength range.

Wideband antireflective surface structures for optics and methods of manufacturing the same

The present invention provides a method for making a high strength, small grain size ceramic having a transgranular fracture mode by rapid densification of a green body and subsequent cooling of the densified ceramic. The ceramic may include dislocations, defects, dopants, and/or secondary phases that are formed as a result of the process and resulting in stress fields capable of redirecting or arresting cracks within the material. This ceramic can maintain transparency from ultraviolet to mid-wave infrared.

High strength ceramics with novel fracture mode

Fiber optic amplification includes a photonic crystal fiber coupled to a pump laser through a first coupler. The pump laser emits a first electromagnetic radiation wave into the photonic crystal fiber at a first oscillation frequency and a second electromagnetic radiation wave into the photonic crystal fiber at a second oscillation frequency equaling the first oscillation frequency. The first and second electromagnetic radiation waves interact to generate a signal comprising an electromagnetic radiation wave at a third oscillation frequency and an idler comprising a fourth electromagnetic radiation wave at a fourth oscillation frequency to be generated and amplified through parametric amplification. Parametric amplification is achieved by four wave mixing. The photonic crystal fiber emits a parametric output signal based on the four wave mixing. A nonlinear crystal frequency doubles the parametric output signal through second-harmonic generation.

Multi-wavelength sources based on parametric amplification

The present invention provides a method for making a high strength, small grain size ceramic having a trans-granular fracture mode by rapid densification of a green body and subsequent cooling of the densified ceramic. The ceramic may include dislocations, defects, dopants, and/or secondary phases that are formed as a result of the process and resulting in stress fields capable of redirecting or arresting cracks within the material. This ceramic can maintain transparency from ultraviolet to mid-wave infrared.

The invention relates to methods for fabricating antireflective surface structures (ARSS) on an optical element using a seed layer of material deposited on the surface of the optical element. The seed layer is removed during or after the etching, and serves to control etching time as well as the transmission region of the optical element having ARSS. Optical elements having ARSS on at least one surface are also provided.

Seed layer for fabrication of antireflective surface structures on optical elements

A nanoparticle containing monoclinic lutetium oxide. A method of: dispersing a lutetium salt solution in a stream of oxygen gas to form droplets, and combusting the droplets to form nanoparticles containing lutetium oxide. The combustion occurs at a temperature sufficient to form monoclinic lutetium oxide in the nanoparticles. An article containing lutetium oxide and having an average grain size of at most 10 microns.

Flame spray synthesis of nanoparticles of monoclinic Lu203 and dopant

The invention relates to methods for fabricating antireflective surface structures (ARSS) on an optical element using a three-dimensional film layer applied to the surface of the optical element. The methods beneficially permit materials that do not exhibit local variation in physical and chemical properties to be provided with ARSS. Optical elements having ARSS on at least one surface are also provided.

Anti-reflective surface structures formed using three-dimensional etch mask

The present invention is generally directed to a device comprising multiple specialty glass optical fibers that combines several different mid-infrared optical signals from multiple optical fibers into one signal in a single optical fiber. In addition, the present invention provides for a method of making the device.

Fiber-based mid-IR signal combiner and method of making same

A &#x3b2;-SiC coating made by the method of mixing SiOwith carbon and heating the mixture in vacuum wherein the carbon is oxidized to CO gas and reduces the SiOto SiO gas and reacting a carbon material, comprising stainless steel with a carbon coating, with the SiO gas at a temperature in the range of 1300 to 1600&#xb0; C. resulting in a SiC coating on the stainless steel.

In situ grown SiC coatings on carbon materials

A method for creating a random anti-reflective surface structure on an optical fiber including a holder configured to hold the optical fiber comprising a groove and a fiber connector, an adhesive material to hold the optical fiber in the holder and fill any gap between the optical fiber and the holder, a glass to cover the adhesive material and the optical fiber, and a reactive ion etch device. The reactive ion etch device comprises a plasma and is configured to expose an end face of the optical fiber to the plasma. The plasma is configured to etch a random anti-reflective surface structure on the end face of the optical fiber.

Antireflective surface structures for active and passive optical fiber

The present invention is directed to a method for making infrared transmitting graded index optical elements by selecting at least two different infrared-transmitting materials, each with a different refractive index, having similar thermo-viscous behavior; assembling the infrared-transmitting materials into a stack comprising one or more layers of each infrared-transmitting material resulting in the stack having a graded index profile; and forming the stack into a desired shape. Also disclosed is the related optical element made by this method.

Infrared (IR) transmitting graded index (GRIN) optical elements and method for making same

A system and method for creating a random anti-reflective surface structure on an optical fiber including a holder configured to hold the optical fiber comprising a groove and a fiber connector, an adhesive material to hold the optical fiber in the holder and fill any gap between the optical fiber and the holder, a glass to cover the adhesive material and the optical fiber, and a reactive ion etch device. The reactive ion etch device comprises a plasma and is configured to expose an end face of the optical fiber to the plasma. The plasma is configured to etch a random anti-reflective surface structure on the end face of the optical fiber.

A method of purifying a spinel powder includes contacting a spinel powder with an acid solution to form an acid-washed spinel composition and contacting the acid-washed spinel composition with a basic solution to form a purified composition. The purified powder is suited to formation of low-absorption shaped bodies, such as windows for high intensity laser devices.

Low absorption spinel formed by acidic and basic treatments

A method for forming a high purity, copper indium gallium selenide (CIGS) bulk material is disclosed. The method includes sealing precursor materials for forming the bulk material in a reaction vessel. The precursor materials include copper, at least one chalcogen selected from selenium, sulfur, and tellurium, and at least one element from group IIIA of the periodic table, which may be selected from gallium, indium, and aluminum. The sealed reaction vessel is heated to a temperature at which the precursor materials react to form the bulk material. The bulk material is cooled in the vessel to a temperature below the solidification temperature of the bulk material and opened to release the formed bulk material. A sputtering target formed by the method can have an oxygen content of 10 ppm by weight, or less.

Synthesis of high-purity bulk copper indium gallium selenide materials

The present invention provides an optical detector device, including: a metal absorber layer; and a dielectric cover layer coupled to the metal absorber layer, wherein the dielectric cover layer includes one or more antireflective structured surfaces. The optical detector device further includes one or more of a passive substrate layer and an active thermoelectric element layer coupled to the metal absorber layer opposite the dielectric cover layer. The one or more antireflective structured surfaces each utilize a random pattern.

Optical detector based on an antireflective structured dielectric surface and a metal absorber

Growing community of inventors

Charlotte, NC, United States of America

Ishwar Dayal Aggarwal