James A Michael

US Patent:

20140064316, Mar 6, 2014

Filed:

Jul 11, 2012

Appl. No.:

13/546888

Inventors:

Richard B. MILES - Princeton NJ, US
Arthur Dogariu - Hamilton NJ, US
James B. Michael - Ames IA, US

International Classification:

H01S 3/097

US Classification:

372 59

Abstract:

Systems and methods for lasing molecular gases, and systems and methods of detecting molecular species are provided. The systems and methods can include the use of an excitation laser tuned to a wavelength associated with oxygen or nitrogen. The lasing can occur in both the forward and reverse directions relative to the excitation laser beam. Reverse lasing can provide a laser beam that propagates back toward the excitation laser source, and can provide a method for remote sampling of molecular species contained in the air. For example, systems and methods of detecting a molecular species of interest can be achieved by using the properties of the backward or forward propagating air laser to indicate a change in a pulse from the source of laser pulses caused by a modulation laser tuned to interact with the molecular species of interest.

US Patent:

20140071256, Mar 13, 2014

Filed:

May 3, 2012

Appl. No.:

14/115129

Inventors:

Richard B. Miles - Princeton NJ, US
Arthur Dogariu - Hamilton NJ, US
James B. Michael - Ames IA, US
Matthew R. Edwards - Santa Monica CA, US

Assignee:

The Trustees of Princeton University - Princeton NJ

International Classification:

G01P 5/18

US Classification:

348 61

Abstract:

An apparatus for the imaging of gaseous fluid motion is disclosed. The apparatus includes a sub-nanosecond pulsed laser. The sub-nanosecond pulsed laser is configured to cause a particle species to fragment and for the recombining fragments subsequently to fluoresce. The apparatus also includes a gaseous fluid comprised of particle species. The apparatus also includes a time gated camera. The time gated camera configured to capture at least one image of the fluorescence from the recombining particle fragment species displaced after a specific time lapse following the laser pulse. Additionally, a fluid velocity can be calculated from a comparison of the image of the displaced particle species to an initial reference position and the time lapse. A Femtosecond Laser Electronic Excitation Tagging (FLEET) method of using the disclosed apparatus is also disclosed.