DocumentCode :
1082420
Title :
Measurement of a very high displacement sensitivity of the beat frequency in an He-Ne laser
Author :
Weksler, M. ; Vager, Z. ; Neumann, G.
Author_Institution :
Weizmann Institute of Science, Rehovot, Israel
Volume :
16
Issue :
7
fYear :
1980
fDate :
7/1/1980 12:00:00 AM
Firstpage :
785
Lastpage :
790
Abstract :
An He-Ne laser with enhanced sensitivity to small displacements is described. The laser is forced to oscillate in two longitudinal modes by an internal mode selector of the Fox-Smith interferometric type. Displacements are induced in one arm of the mode selector and cause a frequency modulation of the beat frequency between the two modes. Experimental data is presented which demonstrate that the frequency modulation varies quadratically with the displacements. This behavior is explained in terms of changes in the dispersive index of refraction of the amplifying medium, induced by the displacements. The laser beat frequency has a displacement sensitivity of 4 \\times 10^{11} Hz/cm and a noise equivalent displacement of 10-12cm/Hz1/2. The system was used to measure displacements on the order of 10-4Å.
Keywords :
Displacement measurement; Noble-gas lasers; Optical measurements; Dispersion; Displacement measurement; Frequency measurement; Frequency modulation; Laser modes; Laser noise; Laser theory; Lenses; Mirrors; Physics;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1980.1070566
Filename :
1070566
Link To Document :
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