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Proceedings Paper

High intensity, single mode He-Ne laser as a light source of multi-dimension interferometer
Author(s): Shuko Yokoyama
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Paper Abstract

Highest intensity, single mode He-Ne laser can be obtained by combination of 3-modes operation of a 3∼4 modes oscillating laser tube and a polarizer for selection of a single mode. In this experiment, as a 3∼4 modes oscillating laser tube, a tube whose cavity length is 35cm and output intensity is 5mW was employed. By selectively using the center mode of 3-modes oscillation as a single mode, highest intensity, single mode He-Ne laser has been realized.

For a particular mode stabilization, the polarization stabilization method whose control signal is intensity is usually used. However, mode stabilization at the gain curve center is difficult in this method. Moreover, detection of the intensity is uncertain due to temperature drifts in the detector sensitivity and amplifiers, and contamination in the cavity mirror and detector surface, resulting in decreasing the frequency stability.

In this experiment, intermode beat frequency change by Frequency Pulling which is strongly related to the mode position was utilized for the stabilization. The difference frequency of two intermode beats generated by the center mode and two other modes which oscillate at each side of the center mode is used as a control signal. It is convenient for the stabilization that the position of this frequency variation corresponding to the most intense center mode oscillation is at middle of its slope. Because the control signal based upon the frequency can be processed digitally, this stabilization method is free from uncertainties which is inevitable in the polarization stabilization method.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778EL (1 September 1996); doi: 10.1117/12.2316214
Show Author Affiliations
Shuko Yokoyama, IDEC Izumi Co. (Japan)

Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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