High speed digital holography for density and fluctuation measurements (invited)
- Third Dimension Technologies LLC, 3601 Bluff Point Drive, Knoxville, Tennessee 37920 (United States)
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
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 {approx}40 000 fps at {approx}64x4 pixels) with resolutions up to 640x512 pixels suitable for use with a CO{sub 2} laser are readily available, if expensive.
- OSTI ID:
- 22058739
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-speed digital holography for neutral gas and electron density imaging
Direct to Digital Holography for Semiconductor Wafer Defect Detection and Review