Heterodyne interferometer with unequal path lengths
Journal Article
·
· Review of Scientific Instruments
- Applied Physics, California Institute of Technology, Pasadena, California 91125 (United States)
Laser interferometry is an extensively used diagnostic for plasma experiments. Existing plasma interferometers are designed on the presumption that the scene and reference beam path lengths have to be equal, a requirement that is costly in both the number of optical components and the alignment complexity. It is shown here that having equal path lengths is not necessary, instead, what is required is that the path length difference be an even multiple of the laser cavity length. This assertion has been verified in a heterodyne laser interferometer that measures typical line-average densities of {approx}10{sup 21}/m{sup 2} with an error of {approx}10{sup 19}/m{sup 2}.
- OSTI ID:
- 20853506
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 77; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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