Scott Sanders

US Patent:

7184144, Feb 27, 2007

Filed:

Aug 8, 2003

Appl. No.:

10/637472

Inventors:

Scott T. Sanders - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

G01J 3/28

US Classification:

356326, 372 21

Abstract:

A high scan rate spectroscopic system converts a narrow-band laser pulse into a multispectral pulse, using, for example, a nonlinear fiber. The multispectral pulse is then converted to a swept frequency pulse through a second fiber impressing a frequency-dependent delay in the light beam which is then applied to the object to be tested.

US Patent:

7196839, Mar 27, 2007

Filed:

Feb 8, 2006

Appl. No.:

11/275995

Inventors:

Scott Thomas Sanders - Madison WI, US
Joachim Werner Walewski - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H01S 3/30

US Classification:

359333, 372 5

Abstract:

An ultraviolet super-continuum source with a fiber-optic may be provided with direct stimulation by a laser having a relatively narrow bandwidth, for example, less than the typical Raman shift in the material of the optical fiber to provide a super-continuum source extending for wavelengths below 400 nanometers.

US Patent:

7260122, Aug 21, 2007

Filed:

Nov 24, 2004

Appl. No.:

10/997100

Inventors:

Scott T. Sanders - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H01S 3/10

US Classification:

372 20, 372 19, 372 33

Abstract:

An external cavity laser may be swept rapidly in frequency and cavity length to prevent formation of modes providing improved spectral response and light characteristics.

US Patent:

7483143, Jan 27, 2009

Filed:

Jun 6, 2006

Appl. No.:

11/447631

Inventors:

Scott T. Sanders - Madison WI, US
Joachim W. Walewski - Unterhaching, DE

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

G01B 9/02

US Classification:

356454, 356484

Abstract:

An apparatus and method are provided for conducting heterodyne frequency-comb spectroscopy. The apparatus includes a first and second frequency-comb generators for generating corresponding first and second continuous wave laser beams, respectively. The first beam defines a spectrum of light having a plurality of modes spaced by a first frequency. The second beam defines a spectrum of light having a plurality of modes spaced by a second frequency that is greater than the first frequency. The first and second beams are combined and the optical power of the combined beam is monitored with a data acquisition system to record a time trace. The recorded time trace is Fourier transformed such that each of spectrums of the first and second beams will exhibit a low-frequency comb. By superimposing the two combs, a beat frequency in a low-frequency region is assigned to an optical frequency.

US Patent:

7613214, Nov 3, 2009

Filed:

May 16, 2007

Appl. No.:

11/749553

Inventors:

Scott Thomas Sanders - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H01S 3/098

US Classification:

372 18, 372 23, 372 26

Abstract:

A mode-locked laser employs a light-wavelength-dependent, path-length adjuster to provide different path-lengths for multiple light frequencies and dual modulation frequencies selecting multiple modes with different wavelengths. The result is a single cavity laser producing mode-locked light outputs at defined different frequencies. Tuning of each frequency may be obtained by changing the laser modulation frequencies.

US Patent:

7619742, Nov 17, 2009

Filed:

Jun 28, 2007

Appl. No.:

11/770325

Inventors:

Scott T. Sanders - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

G01B 9/02

US Classification:

356451, 356450

Abstract:

A high-speed absorption spectrographic system employs a slit-less spectroscope to obtain high-resolution, high-speed spectrographic data of combustion gases in an internal combustion engine allowing precise measurement of gas parameters including temperature and species concentration.

US Patent:

7633977, Dec 15, 2009

Filed:

Aug 8, 2007

Appl. No.:

11/835842

Inventors:

Scott Thomas Sanders - Madison WI, US
Thilo Kraetschmer - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H01S 3/30

US Classification:

372 6, 372 25, 372 26, 372 28, 372 30, 372 32

Abstract:

A laser provides a cavity with complementary wavelength-dependent delay elements to provide the same optical length but time-staggered light paths for different colors. This provides the ability to individually control multiple narrow bands of colors each in a separate time division window.

US Patent:

7826061, Nov 2, 2010

Filed:

Aug 20, 2009

Appl. No.:

12/544313

Inventors:

Scott T. Sanders - Madison WI, US

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

G01B 9/02

US Classification:

356451, 356477

Abstract:

A high-speed absorption spectrographic system employs a slit-less spectroscope to obtain high-resolution, high-speed spectrographic data of combustion gases in an internal combustion engine allowing precise measurement of gas parameters including temperature and species concentration.