Abstract
A modulated far-infrared laser interferometer which is presently operating on the PDX experiment at Princeton is described. The interferometer geometry permits the characterization of inside “D”, outside “D” as well as circular discharges. To achieve this versatility, a titanium corner cube reflector, mounted inside the PDX vacuum vessel is used in conjunction with a second visible wavelength interferometer for vibration corrections. In addition, the use of room temperature quasi-optical Schottky diodes in the far-infrared interferometer is reported. The minimum detectable line average density of the system is ∼5×1011 cm−3.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S. M. Wolfe, K. J. Button, J. Waldman, and D. R. Cohn, Appl. Optics15, 2645 (1976).
D. Baker and S. T. Lee, Rev. Sci. Inst.49, 7, 919 (1978).
J. P. Crenn and D. Veron, Proc. 4th Int. Conf. on Infrared and Millimeter Waves, p. 32, Dec. (1979).
H. R. Fetterman, P. E. Tannewald, B. J. Clifton, C. D. Parker, W. D. Fitzgerald and N. R. Erickson, Appl. Phys. Lett.33, 2 (1978).
The diodes discussed above were obtained from M.I.T. Lincoln Lab. and have been designed for use at 120 μm.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mansfield, D.K., Johnson, L.C. & Mendelsohn, A. A vibrationally compensated far infrared laser interferometer for plasma density measurements. Int J Infrared Milli Waves 1, 631–640 (1980). https://doi.org/10.1007/BF01013472
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01013472