Li Fu Wang

US Patent:

6410924, Jun 25, 2002

Filed:

Nov 16, 1999

Appl. No.:

09/440985

Inventors:

Li Wang - San Jose CA

Assignee:

Schlumberger Technologies, Inc. - San Jose CA

International Classification:

H01J 4948

US Classification:

250398, 250305

Abstract:

The resolution of a charged particle beam, such as a focused ion beam (FIB), is optimized by providing an energy filter in the ion beam stream. The energy filter permits ions having a desired energy range to pass while dispersing and filtering out any ions outside the desired energy range. By reducing the energy spread of the ion beam, the chromatic aberration of the ion beam is reduced. Consequently, the current density of the ion beam is increased. The energy filter may be, e. g. , a Wien type filter that is optimized as an energy filter as opposed to a mass filter. For example, to achieve useful dispersion the energy filter may use a quadrupole structure between two magnetic pole pieces thereby producing a combined quadrupole electric field and dipole electric field within a magnetic field.

US Patent:

6481901, Nov 19, 2002

Filed:

Aug 2, 2001

Appl. No.:

09/922323

Inventors:

Li Wang - San Jose CA
Timothy Yuen-Lian Wang - San Jose CA

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 636

US Classification:

385 79

Abstract:

Improved designs of fiber collimators that include an asymmetric sleeve are disclosed. According to one embodiment of the present invention, the asymmetric sleeve is so shaped that, when arranged next to each other, two collimators with the asymmetric sleeve achieves a lateral distance shorter than the outer diameter of the collimators, which makes it possible to design smaller optical components without effecting the performance and characteristics thereof.

US Patent:

6560378, May 6, 2003

Filed:

Aug 2, 2001

Appl. No.:

09/921791

Inventors:

Weimin Liu - Sunnyvale CA
Li Wang - San Jose CA

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 600

US Classification:

385 11, 354483, 354494, 385 33, 385 34

Abstract:

The present invention, generally speaking, provides compact design of optical couplers for combining two differently polarized light beams onto a collimator or splitting a composed light beam into two differently polarized light beams. According to another embodiment, the size of the polarization beam combiner is minimized by using a pair of specially designed fiber collimators that use an asymmetrical sleeve. As a result, a coupler, according to the present invention, uses less components, is of small in size and provides an easy-aligning structure. Further the coupler offers lower optical insertion loss with minimized physical size.

US Patent:

6630667, Oct 7, 2003

Filed:

Sep 29, 2000

Appl. No.:

09/675981

Inventors:

Li Wang - San Jose CA
Timothy Michael Montagne - Fremont CA
Sergey Etchin - Cupertino CA
Subramanian V. Sankar - Fremont CA

Assignee:

NPTest, LLC - San Jose CA

International Classification:

G01N 2300

US Classification:

250310, 250306, 250309

Abstract:

A scintillator assembly used in a FIB (Focused Ion Beam) system to detect secondary electrons achieves nearly 100 percent collection efficiency for the majority of useful secondary electron energy ranges. Further, the insulator in the assembly is placed such that it is completely out of the secondary electron path in order to avoid arcing which affects FIB secondary electron imaging. Also, the gap between the grounding cap and the scintillator allows high collection efficiency offered by earlier designs to be retained, and at the same time, improves the system reliability. Further, the scintillator assembly may be placed closer to the primary ion beam, which further improves collection efficiency.

US Patent:

6678459, Jan 13, 2004

Filed:

Oct 29, 2001

Appl. No.:

10/046445

Inventors:

Li Wang - San Jose CA
Bright An - Mountain View CA
Yi-ping Loh - San Jose CA
Timothy Yuen-Lian Wang - San Jose CA

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 626

US Classification:

385147, 385 39

Abstract:

A method for bonding two or more optical parts and an optical apparatus of using the method are disclosed. According to one embodiment, two optical fiber segments are used as a spacer between two optical parts. The optical fiber segments may be cut off from a commonly used optical fiber according to the size of the parts. In general, the diameter of the optical fiber segments is small, the capillary effect for commonly used adhesives can be eliminated when the two optical parts are bonded with the optical fiber segments in between.

US Patent:

6792183, Sep 14, 2004

Filed:

Nov 16, 2001

Appl. No.:

09/990487

Inventors:

Yuqiao Liu - Sunnyvale CA
Li Wang - San Jose CA
Zhupei Shi - San Jose CA
Wei-Shin Tsay - Saratoga CA

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 626

US Classification:

385 52, 385 49, 385136, 385137

Abstract:

Techniques for bonding aligned optical parts to a substrate are disclosed. According to one embodiment, one or more wedges are used to fill in gaps between aligned optical parts and a substrate. Using an appropriate material, the wedges are respectively slid in till respective contacts between the aligned optical parts and the wedges are established, a small amount of a bonding agent is then only applied to the respect contacts. As a result, the shrinkage that may be caused by the bonding agent to destabilize the aligned optical parts is minimized and the alignments among the optical parts are preserved and can sustain under very high environmental stresses.

US Patent:

6914722, Jul 5, 2005

Filed:

Mar 12, 2002

Appl. No.:

10/096380

Inventors:

Li Wang - San Jose CA, US
Jerry Lee - Saratoga CA, US
Tim Wang - San Jose CA, US

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B027/28
G02B006/27

US Classification:

359497, 359494, 385 11

Abstract:

A fiber optical circulator includes a first collimator and a second collimator sandwiching a circulator core therebetween. The first collimator and the second collimator respectively define Port and Port thereof, and the first collimator further defines Port thereof. The circulator core includes a first crystal and a second crystal at two ends respectively confronting the first collimator and the second collimator aside. The circulator core further includes a first group of two half-wavelength waveplates and a first Faraday rotator, and second subassembly a second group of two half-wavelength waveplates and a second Faraday rotator. A third crystal is disposed between the first subassembly and the second subassembly wherein a backward light path from Port to Port passes the third crystal and is deflected by the third crystal toward the first collimator though total internal reflection.

US Patent:

6943938, Sep 13, 2005

Filed:

May 10, 2002

Appl. No.:

10/144596

Inventors:

Yuqiao Liu - Sunnyvale CA, US
Li Wang - San Jose CA, US
Wei-Shin Tsay - Saratoga CA, US

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

H01S003/00
G02B006/42
H04J014/02

US Classification:

3593372, 385 18, 398 82, 398 85

Abstract:

Improved designs of optical devices for processing optical signals with own or more specified wavelengths are disclosed. According to embodiment, a filter mirror assembly appears an “L” shape and provides a filtering function as well as a reflecting function. The filter mirror assembly is so mounted that a rotation thereof will not alter the optical path the beam positions of signals resulted from the filter mirror assembly.