United States of America As Represented by the Secretary of the Air Force

Other

Paul S Hsu

James R Gord

Sukesh Roy

Mikhail N Slipchenko

Naibo Jiang

Waruna Kulatilaka

Systems and methods for measuring temperature in an environment by creating a first beam having an energy of about 50 mJ/pulse, and a pulse duration of about 100 ps. A second beam is also created, having an energy of about 2.3 mJ/pulse, and a pulse duration of about 58 ps. The first beam and the second beam are directed into a probe region, thereby expressing an optical output. Properties of the optical output are measured at a sampling rate of at least about 100 kHz, and temperature measurements are derived from the measured properties of the optical output. Such systems and methods can be used to measure temperature in environments exhibiting highly turbulent and transient flow dynamics.

Systems and methods for high-speed, spectroscopic, gas-phase thermometry

A low-repetition-rate (10-Hz), picosecond (ps) optical parametric generator (OPG) system produces higher energy output levels in a more robust and reliable system than previously available. A picosecond OPG stage is seeded at an idler wavelength with a high-power diode laser and its output at &#x2dc;566 nm is amplified in a pulsed dye amplifier (PDA) stage having two dye cells, resulting in signal enhancement by more than three orders of magnitude. The nearly transform-limited beam at &#x2dc;566 nm has a pulse width of &#x2dc;170 ps with an overall output of &#x2dc;2.3 mJ/pulse. A spatial filter between the OPG and PDA stages and a pinhole between the two dye cells improve high output beam quality and enhances coarse and fine wavelength tuning capability.

Nearly transform-limited, low-repetition-rate, picosecond optical parametric generator

A high energy UV fiber-coupled laser-induced fluorescence system is provided having a transmission component and a receiving component. The transmission component includes a laser source configured to produce high-energy UV pulses, a UV-enhanced fused-silica fiber coupled to the laser source, and optics coupled to the UV-enhanced fused-silica fiber for transmitting the high-energy UV pulses to a target area. The receiving component receives laser-induced florescence events from the target area and includes additional UV-enhanced fused-silica fiber coupled to optics and a receiving means.

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Dayton, OH, United States of America

Paul S Hsu