Picosecond-Laser-Based Fiber-Coupled Coherent Anti-Stokes Raman Scattering (CARS) Spectroscopy System

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$99,895.00
Award Year:
2008
Program:
SBIR
Phase:
Phase I
Contract:
FA9101-08-M-0017
Agency Tracking Number:
F073-134-1219
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
SPECTRAL ENERGIES, LLC
2513 Pierce Ave., Ames, IA, 50010
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
782766831
Principal Investigator:
Sivaram Gogineni
Technical Director
(937) 266-9570
contact@spectralenergies.com
Business Contact:
Terrence Meyer
Technical Director
(936) 286-5711
contact@spectralenergies.com
Research Institution:
n/a
Abstract
The objective of the proposed Phase-I research effort is to perform temperature and species measurements in both H2-air and C2H4-air flames using a fiber-coupled picosecond CARS system. Single-mode and step-index multi-mode fibers will be investigated for the delivery of the picosecond lasers to pump the target species and also to collect the generated CARS signal. The key element of our proposed innovation is the use of the picosecond CARS, that has the ability to suppress the nonresonant background signal from the hydrocarbon-air combustion by several orders of magnitude by tuning the delay of the probe laser after the interaction of the pump and Stokes lasers with the target. It also well-suited to the hypersonic regime for studying non-equilibrium phenomena. The unique feature of the ps-CARS technique for fiber delivery is that it requires two orders of magnitude less energy per laser pulse compared to the conventional nanosecond CARS. This effort will be based on a combination of both the experimental demonstration and a theoretical investigation of the propagation of picosecond laser pulses through various fibers. We will also explore the use of a new class of dispersion managed optical fibers such as hollow core fibers and photonic crystal fibers (PCF). Based on the success of the Phase-I effort we will build and deliver a picosecond laser-based fiber-coupled CARS system for wind-tunnel and gas turbine combustor thermometry and speciation during the Phase-II research effort.

* information listed above is at the time of submission.

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