Tipd, LLC

Lam Research Corporation

The University of Arizona

A9.com, Inc.

Lloyd J LaComb, Jr

Arkady Bablumyan

Nasser N Peyghambarian

Wilbur C Krusell

Rahul Jairath

Saket Chadda

Khanh Kieu

Yushi Kaneda

Jiri Pecen

John Fielden

Laser sources of the present invention allow for the efficient generation of harmonic frequencies from broadband sources. Over-compression and under-compression of a split signal result in two beams chirped in opposite directions. These two beams may be combined in a non-linear crystal to generate a narrow-band harmonic signal from a broadband source.

Laser generation apparatus and sources using the same

A waveguide image combiner is used to transmit a monochrome or full-color image in an augmented reality display. The combiner uses multiple stacked substrates and multiple pairs of incoupling and outcoupling VHOEs to expand a first FOV and an image expander to expand the second or perpendicular FOV. This suitably provides an expanded FOV that offers a diagonal FOV&#x2265;50&#xb0;, a horizontal FOV&#x2265;40 and a vertical FOV&#x2265;25&#xb0;. The combiner also delivers a large horizontal eye box up to 20 mm and a vertical eye box of 10 mm while maintaining high light efficiency of the real scene (e.g. &#x3e;80%). The system is able to use a light engine based on broadband (10 nm&#x2264;&#x394;&#x3bb;&#x2264;40 nm) LEDs and maintain a large horizontal field of view and high transmission of the real imagery. The approach resolves issues with current embodiments including astigmatism, image overlap, color balance, and small light engine pupils leading to reduced eye boxes.

Waveguide image combiners for augmented reality displays

Transmission and reflection mode VHOEs are designed and fabricated for use in imaging and other applications. These VHOE provide high diffraction efficiency with minimal chromatic aberrations and astigmatism across the bandwidth. The lens provides optical power within the bandwidth centered relative to several wavelengths to magnify (focus or collimate) input light and is transparent for the rest of the image spectrum. In transmission mode, two VHOE are fabricated in such a way as to introduce compensating adjustments that minimize the astigmatism and chromatic aberrations introduced by the bandwidth of the input light. Two VHOEs are required to provide an on-axis imaging system to magnify light to form an image and reduce the chromatic aberrations across the bandwidth and reduce the astigmatism while maintaining high diffraction efficiency (DE). In reflection mode, a single VHOE is configured to act as a mirror at the specified wavelength and bandwidth and to magnify light to form an image and, consequently, has minimal level of astigmatism and chromatic aberration.

Volume holographic optical elements for imaging with reduced aberrations

A method and apparatus for in-situ monitoring of thickness using a multi-wavelength spectrometer during chemical mechanical polishing (CMP) of a substrate using a polishing tool and a film thickness monitor. The tool has an opening placed in it. The opening contains a monitoring window secured in it to create a monitoring channel. A film thickness monitor views the substrate through the monitoring channel to provide an indication of the thickness of a film carried by the substrate. This information can be used to determine the end point of the CMP process, determine removal rate at any given circumference of a substrate, determine average removal rate across a substrate surface, determine removal rate variation across a substrate surface, and optimize removal rate and uniformity. The film thickness monitor comprises a spectrometer.

Method and apparatus for in-situ monitoring of thickness using a

Growing community of inventors

Tucson, AZ, United States of America

Lloyd J LaComb, Jr