Qiang Fu

US Patent:

6341009, Jan 22, 2002

Filed:

Feb 24, 2000

Appl. No.:

09/512580

Inventors:

John OConnor - Commack NY
Qiang Fu - Port Jefferson Station NY

Assignee:

Quantronix Corporation - East Setauket NY

International Classification:

G03B 2754

US Classification:

355 67, 355 53, 355 77, 25055945

Abstract:

A system and method for photolithographic mask repair. The system includes a structure for supporting a mask to be operated on, a laser emitting device for effecting mask repair, a light source adjacent the support structure for selected illumination of the mask, a laser processor for effecting sequential angular manipulation of a laser beam projecting from the laser emitting device, a computer device for controlling the sequential angular manipulation so as to capture a generally complete waveform of the beam, and a microscope for multi-aspect viewing of the mask during navigation of the beam about the mask. The computer device, simultaneously with manipulation of the beam, effecting fine motion control of the beam, controlled movement of the motorized aperture for effecting the sequential angular manipulation, controlled support structure movement, and image data processing.

US Patent:

6801318, Oct 5, 2004

Filed:

Apr 30, 2002

Appl. No.:

10/136655

Inventors:

Qiang Fu - Forest Hills NY
Sergei Petrovich Nikitin - East Setauket NY
Anatoly Viktorovich Masalov - Troitzk, RU

Assignee:

Excel/Quantronix, Inc. - East Setauket NY

International Classification:

G01B 902

US Classification:

356450, 356456

Abstract:

An apparatus and method to measure optical intensity and phase of one or several light pulses is described. The apparatus combines a spectrally resolved interferometric asymmetric single-shot optical autocorrelator and imaging spectrograph. The asymmetric design of the optical autocorrelator based on second harmonic generation eliminates time-direction ambiguity, while a spectrally resolved interferometric pattern allows the performance of self-check and self-calibration of the apparatus and substantially improves convergence, robustness and reliability of the computational retrieval algorithm.

US Patent:

7079558, Jul 18, 2006

Filed:

Nov 30, 2004

Appl. No.:

10/999711

Inventors:

Faming Xu - Centereach NY, US
Qiang Fu - Dix Hills NY, US
Brian Rogers - Centereach NY, US
Zhengyu Chen - Coram NY, US
Wentao Hu - Centereach NY, US

Assignee:

Excel/Quantronix, Inc. - East Setauket NY

International Classification:

H01S 3/98
H01S 3/13
H01S 3/00

US Classification:

372 3808, 372 18, 372 19, 372 2902

Abstract:

A method and apparatus for stabilizing the output of a mode-locked laser by monitoring the temporal behavior of the pulse train profile and controlling the laser cavity optical length and/or loss modulation frequency accordingly. A mismatch of the cavity optical length and the loss modulation frequency will yield a first characteristic noise condition on the laser beam pulse train when the optical length is too short for a given loss modulation frequency and a second, different noise condition when the optical length is too long. The laser beam is monitored and analyzed to determine which noise condition is present. The cavity optical length is adjusted accordingly by movement of one or more optical elements or by changing the index of refraction of one or more optical elements. In the alternative, or additionally, the loss modulation frequency can be adjusted to bring the laser back into mode lock.

US Patent:

20050088654, Apr 28, 2005

Filed:

Oct 26, 2004

Appl. No.:

10/973969

Inventors:

Wentao Hu - Centereach NY, US
Qiang Fu - Dix Hills NY, US
Mark Ortiz - Shoreham NY, US

Assignee:

Excel/Quantronix, Inc. - East Setauket NY

International Classification:

G01N021/00

US Classification:

356432000, 372009000

Abstract:

A multi-headed laser apparatus combining a two or more lasers in a single housing with a single output beam. In addition to the housing, other components can be shared among the lasers such as the power supply, intracavity shutter, and excitation lamp. Additionally, the combination of two or more lasers with different characteristics makes possible a wide range of applications in the areas of materials processing and analysis, among others. A further multi-laser device is disclosed in which the wavelength of one or more of the lasers can be varied.

US Patent:

20050180468, Aug 18, 2005

Filed:

Apr 13, 2005

Appl. No.:

11/105899

Inventors:

Wentao Hu - Centereach NY, US
Qiang Fu - Dix Hills NY, US
Mark Ortiz - Shoreham NY, US

Assignee:

Excel/Quantronix, Inc. - East Setauket NY

International Classification:

H01S003/10

US Classification:

372009000, 359629000

Abstract:

A multi-headed laser apparatus combining a two or more lasers in a single housing with a single output beam. In addition to the housing, other components can be shared among the lasers such as the power supply, intracavity shutter, and excitation lamp. Additionally, the combination of two or more lasers with different characteristics makes possible a wide range of applications in the areas of materials processing and analysis, among others. A further multi-laser device is disclosed in which the wavelength of one or more of the lasers can be varied.

US Patent:

20130067999, Mar 21, 2013

Filed:

Sep 12, 2012

Appl. No.:

13/611523

Inventors:

Liang Xu - Houston TX, US
Qiang Fu - Houston TX, US

Assignee:

Multi-Chem Group, LLC - San Angelo TX

International Classification:

C09K 8/584
G01N 13/02
G01N 13/00

US Classification:

73 6451, 73 5301, 73 6448, 7315218

Abstract:

A method of determining the suitability of a surfactant for use in a formation can include sampling water in the formation, providing at least two surfactants, and mixing each of the surfactants with the formation water to form surfactant/water samples. The method can further include determining the solubility of each surfactant with the formation water, comparing the solubility of each surfactant with the other surfactant, and assigning a solubility performance value for each surfactant based on its solubility in the formation water sample compared to the other surfactant.

US Patent:

59433515, Aug 24, 1999

Filed:

Feb 2, 1998

Appl. No.:

9/017342

Inventors:

Fuzheng Zhou - Hicksville NY
Qiang Fu - Nesconset NY
Michael Maikowski - Commack NY

Assignee:

Excel/Quantronix, Inc. - Hauppauge NY

International Classification:

H01S 310

US Classification:

372 22

Abstract:

Intra-cavity and/or inter-cavity sub-resonators with dielectric coated mirrors have anti-reflection and high-reflection coatings to attain high efficiency third and higher order harmonics generation of laser radiation. Main-resonators and sub-resonators enhance the fundamental and harmonic oscillations, respectively, which result in high conversion efficiency of third harmonics and higher. Such improved lasing efficiency may be implemented in high power lasers for improved power performance to attain over 8 W of UV output power with a high repetition rate. The use of intra-cavity THG techniques provide high efficiency by using existing high intensities of the input fundamental frequencies available in the intra-cavity region of the laser to avoid damage to components of the laser, such as the laser crystal. The THG utilizes a double-pass and/or multi-pass arrangement, which results in about a 60% increase in output power compared to a single-pass configuration. Also, blocking of UV energy generated in a return pass is performed to eliminate damage by the UV to the components in the main cavity.

US Patent:

20170190952, Jul 6, 2017

Filed:

Mar 22, 2017

Appl. No.:

15/465787

Inventors:

- San Angelo TX, US
Nathan Darrell Davis - Conroe TX, US
Funian Zhao - Tomball TX, US
Qiang Fu - Houston TX, US

International Classification:

C09K 8/54
F16L 58/04
C23F 11/14

Abstract:

Compounds comprising multiple hydrophilic heads and a lipophilic tail may be contacted with a metal or other surface so as to adhere to the surface and inhibit corrosion, among other things. Suitable hydrophilic heads may include quaternary ammonium cation moieties, phosphonium cation moieties, and combinations thereof. Such corrosion-inhibiting compounds may be introduced into a wellbore penetrating at least a portion of a subterranean formation, for instance in oil and/or gas recovery operations and the like, whereupon the compound may adhere to a metal or other surface downhole so as to inhibit corrosion of the surface. These compounds may be employed in various other environments, such as any metal or other surface that may be exposed to corrosive conditions.