Lacy G Cook

US Patent:

6700699, Mar 2, 2004

Filed:

Dec 13, 2002

Appl. No.:

10/319266

Inventors:

Lacy G. Cook - El Segundo CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

G02B 520

US Classification:

359359, 359360, 359350, 359361

Abstract:

A multi-layer anti-reflection coating for simultaneously coupling electromagnetic radiation of two different wavelengths, and , where is greater than , from a first region into a second region is provided. The first region has an index of refraction that is smaller than that of the second region. The anti-reflection coating comprises three layers: (a) a first layer and a third layer that are essentially invisible to and serve to reduce Fresnel losses for and (b) a second layer sandwiched between the first and third layers that serves to reduce Fresnel losses for. The thickness and the index of refraction are calculated for each layer.

US Patent:

6767103, Jul 27, 2004

Filed:

Mar 22, 2002

Appl. No.:

10/104423

Inventors:

Lacy G. Cook - El Segundo CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

G02B 510

US Classification:

359859, 359861, 359729, 359728

Abstract:

An optical system comprises a three-mirror anastigmat including a primary mirror, a secondary mirror, and a tertiary mirror positioned to reflect a beam path. An intermediate image is formed on the beam path at an intermediate-image location between the secondary mirror and the tertiary mirror. A negative-optical-power field mirror is positioned in the beam path at a field-mirror location subsequent to the intermediate-image location along the beam path. The field mirror reflects the intermediate image to the tertiary mirror.

US Patent:

6792028, Sep 14, 2004

Filed:

Mar 22, 2002

Appl. No.:

10/104421

Inventors:

Lacy G. Cook - El Segundo CA
Roger J. Withrington - Los Angeles CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01S 308

US Classification:

372102, 372 98, 372 99, 372100, 372101, 372103

Abstract:

A laser beam pointing and positioning system includes first and second rotatable diffraction gratings. Each grating deviates a laser beam by a predetermined angle of deviation. The relative rotational position of the gratings is controlled to change the beam steering angle and direction of a laser beam. A maximum beam steering angle of twice the angle of deviation may be achieved in any direction. The diffraction gratings may be etched on transmissive substrates of optical glass, sapphire, silicon (Si), Zinc Selenide (ZnSe), Zinc Sulfide (ZnS), or Germanium (Ge). The substrates may be positioned within rotary elements coupled respectively to electromechanical positional control elements to rotate the gratings.

US Patent:

6833547, Dec 21, 2004

Filed:

Jun 14, 2002

Appl. No.:

10/171956

Inventors:

Roy A. Patience - Thousand Oaks CA
Larry L. Cunningham - Redondo Beach CA
Ray D. Kroll - Alta Loma CA
Lacy G. Cook - El Segundo CA

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01J 502

US Classification:

250352, 250332

Abstract:

A system and method for focusing infrared detectors operable at cryogenic temperatures. The invention includes a sensor ( ) for detecting electromagnetic energy comprising a first detector ( ) operable over a first temperature range and a predetermined number of auxiliary detectors ( ) operable over a second temperature range, wherein the auxiliary detectors ( ) are adjacent to and in the same optical plane as the first detector ( ). In the illustrative embodiment, the energy is infrared or visible light, the first temperature range is a range of cryogenic temperatures, and the second temperature range is a range of ambient temperatures. The first detector ( ) is a focal plane array and the auxiliary detectors ( ) are uncooled detector arrays. In the preferred embodiment, the focal plane array ( ) and the uncooled detectors ( ) are disposed on a common substrate. In accordance with the teachings of the present invention, the novel sensor ( ) can be used to focus an optical system at cryogenic temperatures.

US Patent:

6886953, May 3, 2005

Filed:

Feb 25, 2003

Appl. No.:

10/374911

Inventors:

Lacy G. Cook - El Segundo CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G02B005/10

US Classification:

359859, 359858, 359861

Abstract:

An imaging spectrometer includes an all-reflective objective module that receives an image input and produces an objective module output at an exit slit, and an all-reflective collimating-and-imaging module that receives the objective module output as an objective-end input and produces a collimating-end output, wherein the collimating-and-imaging module comprises a reflective triplet. A dispersive element receives the collimating-end output and produces a dispersive-end input into the collimating-and-imaging module that is reflected through the collimating-and-imaging module to produce a spectral-image-end output. An imaging detector receives the spectral-image-end output of the collimating-and-imaging module. The objective module may be a three-mirror anastigmat having an integral corrector mirror therein, or an all-reflective, relayed optical system comprising a set of five powered mirrors whose powers sum to substantially zero. The collimating-and-imaging module may be optimized to minimize spectral smile.

US Patent:

6902282, Jun 7, 2005

Filed:

Mar 22, 2002

Appl. No.:

10/104424

Inventors:

Lacy G. Cook - El Segundo CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G02B005/10

US Classification:

359859, 359861, 359729, 359731

Abstract:

An all-reflective, relayed optical system is arranged along a beam path. The optical system includes a first mirror having positive optical power, and a second mirror having a negative optical power, wherein the second mirror receives the beam path reflected from the first mirror and wherein an intermediate image is formed after the beam path reflects from the second mirror. The optical system further includes a third mirror having positive optical power, wherein the intermediate image on the beam path is reflected from the third mirror; a fourth mirror having a negative optical power, wherein the beam path reflected by the third mirror is reflected by the fourth mirror, and a fifth mirror having positive optical power, wherein the beam path reflected by the fourth mirror is reflected by the fifth mirror to an image location.

US Patent:

6919988, Jul 19, 2005

Filed:

May 6, 2002

Appl. No.:

10/139943

Inventors:

Lacy G. Cook - El Segundo CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G02B013/14

US Classification:

359356, 359350

Abstract:

A system and method for simultaneous imaging of both infrared and millimeter wave radiation. The novel optical system () includes a primary mirror (), a Mangin secondary mirror () positioned to receive energy reflected from the primary mirror (), and an immersion lens () for focusing energy received from the Mangin mirror (). In the illustrative embodiment, the primary mirror () and Mangin mirror () are arranged in a Cassegrain configuration. Central to this invention is the use of a negative power refractive Mangin mirror () as the Cassegrain secondary mirror, so that the field curvature of the secondary mirror () and immersion lens () can be made to cancel. The immersion lens () effectively decreases the wavelength of the millimeter wave radiation, allowing a smaller detector to collect the same amount of radiation as would a larger detector in air. In the illustrative embodiment, the system () further includes a detector array () placed in intimate contact with the immersion lens ().

US Patent:

6989537, Jan 24, 2006

Filed:

Nov 18, 2003

Appl. No.:

10/715678

Inventors:

Lacy G. Cook - El Segundo CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01J 5/02

US Classification:

250353

Abstract:

An infrared imaging optical system includes a front lens group having negative optical power, wherein the front lens group comprises a front lens having a refractive index of from about 2. 0 to about 3. 0; an intermediate lens group that receives an infrared light beam from the front lens group, wherein the intermediate lens group comprises an intermediate lens having a refractive index of from about 1. 35 to about 2. 0; and a rear lens group having positive optical power, wherein the rear lens group receives the infrared light beam from the intermediate lens group, wherein the rear lens group comprises a rear lens having a refractive index of from about 2. 0 to about 3. 0, and wherein at least two of the front lens, the intermediate lens, and the rear lens have at least one aspheric surface thereon. The infrared imaging optical system further includes an infrared detector that receives the infrared light beam from the rear lens group. There is a pupil located between the rear lens group and the detector.