Thomas R Loree340 Calle Sierpe, Santa Fe, NM 87501

5303026, Apr 12, 1994

Feb 12, 1992

7/835641

Karlheinz Strobl - Los Angeles CA
Irving J. Bigio - Los Alamos NM
Thomas R. Loree - Santa Fe NM

The Regents of the University of California Los Alamos National
Laboratory - Los Alamos CA

G01N 2163

356318

Apparatus and method for spectroscopic analysis of scattering media. Subtle differences in materials have been found to be detectable from plots of intensity as a function of wavelength of collected emitted and scattered light versus wavelength of excitation light.

4925307, May 15, 1990

May 1, 1984

6/606037

David A. Cremers - Los Alamos NM
Leon J. Radziemski - Las Cruces NM
Thomas R. Loree - Los Alamos NM

The United States of America as represented by the United States
Department of Energy - Washington DC

G01J 300

356318

A method and apparatus for the qualitative and quantitative spectroscopic investigation of elements present in a liquid sample using the laser spark. A series of temporally closely spaced spark pairs is induced in the liquid sample utilizing pulsed electromagnetic radiation from a pair of lasers. The light pulses are not significantly absorbed by the sample so that the sparks occur inside of the liquid. The emitted light from the breakdown events is spectrally and temporally resolved, and the time period between the two laser pulses in each spark pair is adjusted to maximize the signal-to-noise ratio of the emitted signals. In comparison with the single pulse technique, a substantial reduction in the limits of detectability for many elements has been demonstrated. Narrowing of spectral features results in improved discrimination against interfering species.

5042947, Aug 27, 1991

Sep 24, 1990

7/588496

Manfred Potzschke - Kronberg, DE
Hans-Peter Sattler - Bad Homburg, DE
Kristian Hohla - Munich, DE
Thomas R. Loree - Los Alamos NM

Metallgesellschaft Aktiengesellschaft - Frankfurt am Main

G01N 2163
G01N 2185

356318

Disclosed is a process and apparatus to analyze metal particles to determine their composition and to generate a sorting signal. The particles are exposed to a pulsed laser beam by which they are partly vaporized to form a plasma so that the particles are cleaned and the cleaned area is subsequently partially vaporized by a pulsed laser beam to form a plasma. The spectral lines of the plasma are inspected for an identification of the composition of the metal particles. The required inspection rate of 30 particles per second can readily be achieved or even exceeded if a defined narrow wavelength range or a defined wavelength is filtered from the total radiation that is emitted by the plasma and the intensities of the filtered partial radiations are related to each other to obtain ratios, which are compared with adjustable limiting values. A sorting signal is derived from the result of said comparison. The inspection rate can be improved in that the partial radiation is subjected to a comparison only for a defined interval of time.

5256880, Oct 26, 1993

Jan 24, 1992

7/825485

Thomas R. Loree - Santa Fe NM
Robert E. Hermes - Los Alamos NM

Metallgesellschaft Aktiengesellschaft - Frankfurt

G01N 2164

2504611

A process and apparatus for the qualitative analysis of particles of various kinds of plastic which comprises passing said particles serially in a predetermined path, irradiating each particle with light of short wavelength from 180 to 500 nm, whereby each particle emits light radiation of a longer wavelength, and detecting such longer wavelength emissions for radiation intensities within a narrow wavelength range to form an emission spectrum, the emission spectrum generating a sorting signal.

4144464, Mar 13, 1979

Jan 25, 1978

5/872292

Thomas R. Loree - Los Alamos NM
Dean L. Barker - Los Alamos NM

The United States of America as represented by the United States
Department of Energy - Washington DC

H03F 700

307 883

A device and method for nonresonantly Raman shifting broad band uv excimer laser radiation, which enhances preselected Stokes signals by varying the pressure of the Raman scattering medium, the focal interaction length of the incident radiation within the Raman scattering medium and its power density level. Gaseous molecular H. sub. 2, D. sub. 2, CH. sub. 4 (methane), HD and mixes thereof, and liquid N. sub. 2 are used as the Raman scattering medium to frequency shift the outputs of high power KrF and ArF lasers. A cable fed discharge with an unstable resonant cavity configuration is utilized to produce the output laser power levels required for operation.