Bruce H Chai

US Patent:

7151261, Dec 19, 2006

Filed:

Jan 9, 2004

Appl. No.:

10/754238

Inventors:

Bruce Chai - Sanford FL, US

Assignee:

Crystal Photonics, Incorporated - Sanford FL

International Classification:

G01T 1/20

US Classification:

250362

Abstract:

A method for enhancing the light yield of a single crystal of cerium doped lutetium orthosilicate (LSO) in response to irradiation with high energy radiation includes diffusing oxygen into the crystal by heating the crystal for a period of time in an ambient containing oxygen. This process of thermal oxygenation of the crystal effectively supplies oxygen to fill at least some of the oxygen vacancies in the body of monocrystalline LSO. A scintillation detector comprises a monocrystalline body of LSO enhanced by oxygen diffusion into the crystal.

US Patent:

7166845, Jan 23, 2007

Filed:

Jan 9, 2004

Appl. No.:

10/754850

Inventors:

Bruce Chai - Sanford FL, US

Assignee:

Crystal Photonics, Incorporated - Sanford FL

International Classification:

G01T 1/20

US Classification:

250361R

Abstract:

A method for enhancing the light yield of a single crystal of cerium doped lutetium yttrium orthosilicate (LYSO) in response to irradiation with high energy radiation includes diffusing oxygen into the crystal by heating the crystal for a period of time in an ambient containing oxygen. This process of thermal oxygenation of the crystal effectively supplies oxygen to fill at least some of the oxygen vacancies in the body of monocrystalline LYSO. A scintillation detector comprises a monocrystalline body of LYSO enhanced by oxygen diffusion into the crystal.

US Patent:

7972438, Jul 5, 2011

Filed:

Aug 29, 2007

Appl. No.:

11/847128

Inventors:

Yi-Ting Fei - Oviedo FL, US
Shen Jen - Longwood FL, US
Bruce Chai - Oviedo FL, US

Assignee:

Crystal Photonics, Incorporated - Sanford FL

International Classification:

C30B 29/30

US Classification:

117 13, 117 15, 117 20, 117944

Abstract:

This invention is related to material for use as an ultraviolet (UV) optical element and particularly for use as a 193 nm immersion lens element. The material for use as a UV optical element includes a Lithium Magnesium Aluminate (LMAO) body. The specific compound for this application is the disordered lithium magnesium spinel, having the general composition of LiMgAlOwhere x=0 to 1 as the high-index UV transparent material for immersion lithography. The LMAO body may include a disordered spinel, such as, for example, a single crystal that may be cubic in symmetry, optically isotropic, and having cation disorder within the structure to reduce the intrinsic birefringence (IBR). The LMAO body has certain desired material properties and may be readily made in relatively large sizes suitable for use as the UV optical element for photolithography.

US Patent:

20010010697, Aug 2, 2001

Filed:

Dec 27, 2000

Appl. No.:

09/749326

Inventors:

Dennis Hammons - Orlando FL, US
Qing Ye - Coroing NY, US
Jason Eichenholz - Oviedo FL, US
Bruce Chai - Oviedo FL, US
Martin Richardson - Geneva FL, US

International Classification:

H01S003/10

US Classification:

372/020000

Abstract:

A tunable, solid state laser device with both visible and infrared laser emission is developed with a trivalent ytterbium-doped yttrium calcium oxyborate crystal as the host crystal. The Yb:YCOB crystal generates an infrared fundamental light over a wide bandwidth, from approximately 980 nanometers (nm) to approximately 1100 nm. The bandwidth generated by the Yb:YCOB crystal is approximately 100 nm wide and supports the generation of pulsed infrared light or when self-frequency doubled provides a compact, efficient, source of tunable, visible, blue or green laser light in wavelengths of approximately 490 nm to approximately 550 nm.

US Patent:

20010010700, Aug 2, 2001

Filed:

Dec 27, 2000

Appl. No.:

09/748976

Inventors:

Jason Eichenholz - Oviedo FL, US
Qing Ye - Coroing NY, US
Dennis Hammons - Orlando FL, US
Bruce Chai - Oviedo FL, US
Martin Richardson - Geneva FL, US

Assignee:

University of Central Florida

International Classification:

H01S003/16

US Classification:

372/041000

Abstract:

Neodymium-doped yttrium calcium oxyborate (Nd:YCOB) is the single active gain element for a solid-state laser device capable of achieving both lasing and self-frequency doubling optical effects. A pumping source for optically pumping Nd:YCOB can generate a laser light output of approximately 400 mW at approximately 1060 nm wavelength and a self-frequency doubled output of approximately 60 mW at approximately 530 nm wavelength. Thus, a laser device can be designed that is compact, less expensive and a high-powered source of visible, green laser light.

US Patent:

20020015452, Feb 7, 2002

Filed:

May 3, 2001

Appl. No.:

09/848715

Inventors:

Bruce Chai - Oviedo FL, US
Mitch Chou - Sanford FL, US
Haihong Qiu - Oviedo FL, US
Shen Jen - Lake Mary FL, US

Assignee:

Crystal Photonics, Incorporated - Sanford FL

International Classification:

H03K009/00
H04L027/06
H04L027/14
H04L027/22

US Classification:

375/316000

Abstract:

An electronic device includes a piezoelectric layer formed of an ordered Langasite structure compound having the formula ABCDEwherein A is strontium, B is niobium, C is gallium, D is silicon, and E is oxygen. At least one electrode is connected to the piezoelectric layer and may be configured to define a device, such as a SAW resonator or filter, or a BAW resonator or filter. The ordered Langasite structure compound may have a substantially perfectly ordered structure.

US Patent:

20020021193, Feb 21, 2002

Filed:

May 3, 2001

Appl. No.:

09/848716

Inventors:

Bruce Chai - Oviedo FL, US
Mitch Chou - Sanford FL, US
Haihong Qiu - Oviedo FL, US
Shen Jen - Lake Mary FL, US

Assignee:

Crystal Photonics, Incorporated - Sanford FL

International Classification:

H03H009/54
H03H009/64

US Classification:

333/187000, 333/193000

Abstract:

An electronic filter includes a piezoelectric layer formed of an ordered Langasite structure compound having the formula ABCDE, wherein A is strontium, B is tantalum, C is gallium, D is silicon, and E is oxygen. A plurality of pairs of electrodes are connected to and cooperate with the piezoelectric layer to define a SAW or BAW filter, for example. The ordered Langasite structure compound may have a substantially perfectly ordered structure.

US Patent:

20020027397, Mar 7, 2002

Filed:

May 3, 2001

Appl. No.:

09/847955

Inventors:

Bruce Chai - Oviedo FL, US
Mitch Chou - Sanford FL, US
Haihong Qiu - Oviedo FL, US
Shen Jen - Lake Mary FL, US

Assignee:

Crystal Photonics, Incorporated - Sanford FL

International Classification:

H01L041/04
H02N002/00
C04B035/00

US Classification:

310/31300R, 310/358000, 252/06290R

Abstract:

An electronic device includes a piezoelectric layer formed of an ordered Langasite structure compound having the formula ABCDE, wherein A is calcium, B is niobium or tantalum, C is gallium, D is silicon, and E is oxygen. At least one electrode is connected to the piezoelectric layer and may be configured to define a device, such as a SAW resonator or filter, or a BAW resonator or filter. The ordered Langasite structure compound may have a substantially perfectly ordered structure.