Viavi Solutions Inc.

Jds Uniphase Corporation

Other

Optical Coating Laboratory, Inc.

Charles Andrew Hulse

Karen Denise Hendrix

Nada A O'Brien

Jeffrey James Kuna

Richard Alan Bradley, Jr

Curtis Ross Hruska

Marc K Von Gunten

Jerry Zieba

Changmeng Hsiung

Benjamin F Catching

Christopher G Pederson

Brett Joseph Bryars

Heinz W Siesler

Kim Leong Tan

Robert B Sargent

Frederik Kevin Zernik

William D Houck

Karl M Kissa

Kuochou Tai

Richard Ian Seddon

Andrew Thomas Taylor

Michael R Greenberg

Robert E Klinger

Glen Drake

Donald M Friedrich

Richard James Ryall

William J Minford

Richard A Bradley

Jason Jiazhan Xu

Jason Reed

Hiren V Shah

Julia Duncan

Sargent Robert B,

Richard A Bradley Jr

Brett J Bryars

A variable optical filter is disclosed including a bandpass filter and a blocking filter. The bandpass filter includes a stack of alternating first and second layers, and the blocking filter includes a stack of alternating third and fourth layers. The first, second and fourth materials each comprise different materials, so that a refractive index of the first material is smaller than a refractive index of the second material, which is smaller than a refractive index of the fourth material; while an absorption coefficient of the second material is smaller than an absorption coefficient of the fourth material. The materials can be selected to ensure high index contrast in the blocking filter and low optical losses in the bandpass filter. The first to fourth layers can be deposited directly on a photodetector array.

Variable optical filter and a wavelength-selective sensor based thereon

An optical filter includes a first mirror that has a first uniform thickness, a second mirror that has a second uniform thickness, and a spacer that is positioned between the first mirror and the second mirror. The spacer has a variable thickness along a first axis of the optical filter. In some implementations, a thickness profile of the spacer, along the first axis, includes one or more portions that have a non-linear slope with an absolute value that is greater than zero.

Optical filter

A method and apparatus for field spectroscopic characterization of seafood is disclosed. A portable NIR spectrometer is connected to an analyzer configured for performing a multivariate analysis of reflection spectra to determine qualitatively the true identities or quantitatively the freshness of seafood samples.

Spectroscopic characterization of seafood

A portable spectrometer device includes an illumination source for directing at a sample, and a tapered light pipe (TLP) for capturing light interacting with the sample at a first focal ratio and for delivering the light at a second focal ratio lower than the first focal ratio. A linearly variable filter (LVF) separates the captured light into a spectrum of constituent wavelength signals; and a detector array, including a plurality of pixels, each of the plurality of pixels disposed to receive at least a portion of a plurality of the constituent wavelength signals provides a power reading for each constituent wavelength. Preferably, the TLP is lensed at one end, and recessed in a protective boot with stepped inner walls. The gap between the TLP and LVF is minimized to further enhance resolution and robustness.

Portable spectrometer

A grating trim retarder fabricated from a form-birefringent multi-layer dielectric stack including at least one anti-reflection coating and supported on a transparent substrate is provided. The form-birefringent dielectric stack includes an axially-inhomogeneous element in the form of a &#x2212;C-plate grating and a transversely-inhomogeneous element in the form of an A-plate grating. Each of the &#x2212;C-plate and the A-plate gratings are fabricated with dimensions to form a zeroth order sub-wavelength grating structure. Fabricating the grating trim retarder with anti-reflection coatings and/or a segment where the &#x2212;C-plate and A-plate grating overlap enables the in-plane and out-of-plane retardances to be tailored independently according to the desired application.

Grating trim retarders

An oblique angle deposition is used to provide an A-plate optical retarder having at least one dense, form-birefringent layer. According to one embodiment, the dense, form-birefringent layer(s) are deposited as part of an FBAR stack to provide an all-dielectric full-function A/&#x2212;C-plate trim retarder for LCD birefringence compensation. Advantageously, the dense structure of the full-function A/&#x2212;C-plate trim retarder offers high durability and/or stability, thus making it well suited for providing polarization compensation in high light flux polarization-based projection systems.

Thin-film optical retarders

Growing community of inventors

Sebastopol, CA, United States of America

Charles Andrew Hulse