High Speed Digital Holography for Density and Fluctuation Measurements

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Review of Scientific Instruments

OSTI ID:1001311

Baylor, Larry R ^[1]; Combs, Stephen Kirk ^[1]; Meitner, Steven J ^[1]; Rasmussen, David A ^[1]; Granstedt, E. M. ^[2]; Majeski, R. ^[2]; Kaita, R. ^[2]

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1. ORNL
2. Princeton Plasma Physics Laboratory (PPPL)

The state of the art in electro-optics has advanced to the point where digital holographic acquisition of wavefronts is now possible. Holographic wavefront acquisition provides the phase of the wavefront at every measurement point. This can be done with accuracy on the order of a thousandth of a wavelength, given that there is sufficient care in the design of the system. At wave frequencies which are much greater than the plasma frequency, the plasma index of refraction is linearly proportional to the electron density and wavelength, and the measurement of the phase of a wavefront passing through the plasma gives the chord-integrated density directly for all points measured on the wavefront. High-speed infrared cameras up to 40 000 fps at 644 pixels with resolutions up to 640512 pixels suitable for use with a CO2 laser are readily available, if expensive.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1001311
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 81; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
CAMERAS
ELECTRON DENSITY
FLUCTUATIONS
HOLOGRAPHY
INFRARED RADIATION
LANGMUIR FREQUENCY
REFRACTIVE INDEX
WAVE PROPAGATION
WAVELENGTHS