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Luis Spinelli Phones & Addresses

  • Boca Raton, FL

Publications

Us Patents

Optical Pulse Duration Extender

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US Patent:
7035012, Apr 25, 2006
Filed:
Mar 1, 2004
Appl. No.:
10/790660
Inventors:
Sergei V. Govorkov - Boca Raton FL, US
Luis A. Spinelli - Sunnyvale CA, US
William Eugene White - Santa Clara CA, US
Murray Keith Reed - Menlo Park CA, US
Assignee:
Coherent, Inc. - Santa Clara CA
International Classification:
G02B 27/10
H01S 3/10
H01S 3/22
G03B 27/52
US Classification:
359618, 359619, 359629, 359639, 372 25, 372 55, 372 57, 372108, 355 53, 355 67, 355 69
Abstract:
An optical pulse extender includes a delay loop formed by a plurality of mirrors and a graded reflectivity beamsplitter. The mirrors and the beamsplitter are configured and aligned such that a pulse to be broadened makes a predetermined number of round trips in the delay loop and is incident on a different zone of the beamsplitter after each round trip. The different zones of the beamsplitter have different reflection values and different transmission values. These values are selected such that the pulse extender delivers a plurality of temporally and spatially separated replica pulses each thereof having about the same energy. The delivered replica pulses together provide an extended pulse having a longer duration than the input pulse. The replica pulses may be passed through a beam homogenizer to spatially homogenize the temporal characteristics of the extended pulse.

Optical Pulse Duration Extender

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US Patent:
7184216, Feb 27, 2007
Filed:
Mar 31, 2006
Appl. No.:
11/395737
Inventors:
Sergei V. Govorkov - Boca Raton FL, US
Luis A. Spinelli - Sunnyvale CA, US
William Eugene White - Santa Clara CA, US
Murray Keith Reed - Menlo Park CA, US
Assignee:
Coherent, Inc. - Santa Clara CA
International Classification:
G02B 27/10
H01S 3/10
H01S 3/22
G03B 27/52
US Classification:
359618, 359619, 359629, 372 25, 372 55, 372 57, 372108, 355 53, 355 67
Abstract:
An optical pulse extender includes a delay loop formed by a plurality of mirrors and a graded reflectivity beamsplitter. The mirrors and the beamsplitter are configured and aligned such that a pulse to be broadened makes a predetermined number of round trips in the delay loop and is incident on a different zone of the beamsplitter after each round trip. The different zones of the beamsplitter have different reflection values and different transmission values. These values are selected such that the pulse extender delivers a plurality of temporally and spatially separated replica pulses each thereof having about the same energy. The delivered replica pulses together provide an extended pulse having a longer duration than the input pulse. The replica pulses may be passed through a beam homogenizer to spatially homogenize the temporal characteristics of the extended pulse.

Laser Illuminated Projection Displays

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US Patent:
7244028, Jul 17, 2007
Filed:
Dec 14, 2004
Appl. No.:
11/011736
Inventors:
Sergei V. Govorkov - Boca Raton FL, US
Luis A. Spinelli - Sunnyvale CA, US
Juan L. Chilla - Sunnyvale CA, US
Andrea Caprara - Menlo Park CA, US
Murray K. Reed - Menlo Park CA, US
Assignee:
Coherent, Inc. - Santa Clara CA
International Classification:
G03B 21/14
US Classification:
353 37, 349 5, 353122, 359205
Abstract:
A projection video display includes at least one laser for delivering a light beam. The display includes a beam homogenizer and a condenser lens. A scanning arrangement is provided for scanning the light in beam in a particular pattern over the condenser lens in a manner that effectively increases the beam divergence. The scanned beam is homogenized by a beam homogenizer and a spatial light modulator is arranged to receive the homogenized scanned light beam and spatially modulate the beam in accordance with a component of an image to be displayed. Projection optics are projecting the homogenized scanned light beam onto a screen. The scanning provides that the homogenized scanned light beam at the screen has a coherence radius less than the original coherence radius of the beam. The reduced coherence radius contributes to minimizing speckle contrast in the image displayed on the screen. The screen includes one or more features providing a further contribution to minimizing speckle contrast in the displayed image.
Luis E Spinelli from Boca Raton, FL Get Report