Ultra High Contrast GxL&lt;sup&gt;TM&lt;/sup&gt; Device for Laser Projector

Saruta, Kunihiko; Nishida, Mizuhiko; Yamaguchi, Masanari; Ito, Yasuyuki; Yamashita, Keitaro; Taguchi, A.; Oniki, Kazunao; Tamada, H.

doi:10.1109/sensor.2007.4300588

Cited by 5 publications

(7 citation statements)

References 5 publications

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“…In addition, there is no interference fringe structure inside the pixel, which +1 st and -1 st order diffraction light might have caused. The flat field contrast ratio (all white vs. all black) has been significantly improved 4) . A one-dimensional scan display may sometimes suffer from striation on the dark image.…”

Section: Gxl Modulementioning

confidence: 93%

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56.1: High‐Frame‐Rate, High‐Contrast Grating Light Valve Laser Projection Display

Kikuchi

Hashimoto

Tajiri

et al. 2008

Symp Digest of Tech Papers

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Section: Gxl Modulementioning

confidence: 93%

“…The flat field contrast ratio (all white vs. all black) has been significantly improved 4) . A one-dimensional scan display may sometimes suffer from striation on the dark image.…”

Section: Gxl Modulementioning

confidence: 93%

56.1: High‐Frame‐Rate, High‐Contrast Grating Light Valve Laser Projection Display

Kikuchi

Hashimoto

Tajiri

et al. 2008

Symp Digest of Tech Papers

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“…The speckle contrast was below 10%. 10 The specification of Laser Dream Theater is shown in Table 2. 5 And the internal view is shown in Fig.…”

Section: Gxl Laser Projectormentioning

confidence: 99%

Invited Paper: Blazed GxLP™ light modulators for laser projectors

Tamada

2007

J Soc Info Display

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Abstract— A GxL device is a one‐dimensional light modulator suitable for laser projectors. A blazed GxL, which diffracts the incident laser beam in only one direction was developed, and a contrast ratio of 10,000:1 and a diffraction efficiency of 70% was achieved by nanometer‐order control of ribbons based on the MEMS structural simulation and using common 0.25‐μm CMOS‐compatible fabrication processes. The 1.09‐in.‐long 1080‐pixel blazed GxL was implemented in the 2005‐in. Laser Dream Theater at the 2005 World Exposition in Aichi, Japan, and performed perfectly during that period. Recently, by optimizing the posts supporting the ribbon and flattening of the sacrificial layer using chemical mechanical polishing, an ultra high contrast ratio of 34,700:1 with a 0.72‐in.‐long GxL has been realized, and a smaller ceramic module with high reliability has also been realized. The blazed GxL will be a promising technology to further advance laser‐projector performance.

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“…T UNABLE diffractive elements are interesting for a broad range of optical microelectromechanical systems. Common applications are found in visual displays [1], [2], scanners, miniaturized spectrometers [3], external cavity tunable lasers [4], switches, and wavelength tuning elements in dense wavelength-division multiplexing [5], and active compensation devices for thermal disturbances in optical instruments. Current actuation techniques for diffraction gratings can be classified as either "digital" or "analog" (Fig.…”

Section: Introductionmentioning

confidence: 99%

Analog and Digital Deformable Diffractive Optics Actuated by Inter-Nanomagnet Forces

Deterre

Nichol

et al. 2010

IEEE J. Quantum Electron.

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In this paper, we present a novel actuation technique of diffractive optics based on magnetic interaction forces, permitting a fine resolution tuning as well as a tuning in discrete steps. This actuation combines advantages of "analog" and "digital" tuning in conventional diffractive optics. The application of a magnetic field perpendicularly to the beams of a freestanding grating coated with magnetic material generates intermagnet forces causing these beams to deform slightly or to clump together. A theoretical analysis of the forces has been carried out, followed by actuation simulations in both linear and nonlinear regimes for different types of gratings, showing examples of exponential and parabolic chirp profiles in addition to beam clumping. In experiment, the diffraction patterns of distinct fabricated gratings have shown both a continuous shift and smear as well as a discrete change in the diffracted angles proving the concept of analog and digital tuning.

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Ultra High Contrast GxL<sup>TM</sup> Device for Laser Projector

Cited by 5 publications

References 5 publications

56.1: High‐Frame‐Rate, High‐Contrast Grating Light Valve Laser Projection Display

56.1: High‐Frame‐Rate, High‐Contrast Grating Light Valve Laser Projection Display

Invited Paper: Blazed GxLP™ light modulators for laser projectors

Analog and Digital Deformable Diffractive Optics Actuated by Inter-Nanomagnet Forces

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