Amoco Corporation

Spelman College

Dean R Guyer

Kenneth W Kangas

Candace C Joyner

Walter R Bosenberg

Dennis D Lowenthal

Clifford H Muller

Sheena T Patrick

Peter Chen

Charles E Hamilton

A multiplex coherent Raman spectrometer ( ) and spectroscopy method rapidly detects and identifies individual components of a chemical mixture separated by a separation technique, such as gas chromatography. The spectrometer ( ) and method accurately identify a variety of compounds because they produce the entire gas phase vibrational Raman spectrum of the unknown gas. This is accomplished by tilting a Raman cell ( ) to produce a high-intensity, backward-stimulated, coherent Raman beam of 683 nm, which drives a degenerate optical parametric oscillator ( ) to produce a broadband beam of 1100-1700 nm covering a range of more than 3000 wavenumber. This broadband beam is combined with a narrowband beam of 532 nm having a bandwidth of 0.003 wavenumbers and focused into a heated windowless cell ( ) that receives gases separated by a gas chromatograph ( ). The Raman radiation scattered from these gases is filtered and sent to a monochromator ( ) with multichannel detection.

Multiplex coherent raman spectroscopy detector and method

Methodology and apparatus for producing pulsed, single longitudinal mode optical energy over a widely tunable range of wavelengths by optical parametric frequency conversion.

Tunable pulsed single longitudinal mode optical parametric oscillator

A laser system for producing pulsed, longitudinal mode optical energy over a widely tunable range of wavelengths. The system includes an optical cavity and a solid-state gain medium. The optical cavity comprises first, second, and third optical element means. The first optical element means reflects energy received along a first reflective optical axis and directs the energy toward the second optical element means, which diffracts the optical energy into at least two orders of interference. The energy diffracted according to a first order of interference is reflected back toward the second optical element means by a third optical element means, thereby creating a resonant optical cavity. Another portion of the optical energy diffracted by the second optical element means is produced as an output beam. The solid-state gain medium is located on the optical axis between the first and second optical element means and receives pump energy from a plurality of pump beams that are within two degrees of being colinear with the first reflective optical axis. The solid-state gain medium converts the pump beam energy to optical energy having a desired wavelength with a very high efficiency, without required pump beam energy densities above a predetermined level. The laser system is tunable by moving the third optical element means with respect to the second optical element means, thereby causing optical energy at a tunable wavelength to resonate within the optical cavity.

Tunable pulsed titanium:sapphire laser and conditions for its operation

A cavity design for use with a nonlinear medium which may be used as an oscillator using pump energy with frequency (FP) interacting with the nonlinear medium for parametrically generating outputs having a signal frequency (FS) and an idler frequency (FI) which satisfy the relationship FP=FS+FI. The cavity consists of optics and optical elements that minimize the buildup of intracavity intensity at either of the parametrically waves being generated, creating a condition in which the optical cavity is non-resonant for both the signal and idler frequencies.

High output coupling cavity design for optical parametric oscillators

A method and apparatus for parametric conversion of electromagnetic radiation in KNbO.sub.3 crystals of optical energy at a wavelength near 1 .mu.m to optical energy at wavelengths in the range from 1.4 .mu.m to 4.6 .mu.m. A pump beam and a signal beam impinge on a KNbO.sub.3 crystal and interact to produce optical energy at an idler wavelength and a signal wavelength at the expense of optical energy of the impinging pump beam wavelength. The KNbO.sub.3 crystal has an orientation axis which is aligned with the direction of the impinging pump and signal energy and is on a locus defined by a minimum phase relation between the energy at the pump, signal, and idler frequencies.

Growing community of inventors

Bellevue, WA, United States of America

Dean R Guyer