Qiang Fu

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:

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.