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FIELD PATTERNS IN A RUBY LASER,
MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL ENGINEERING
A discussion is first given of the offaxis modes and of the mode selection mechanism. Experimentally it is then shown that radiation did appear at discrete angles with the axis, but some modes that were expected to be seen were not observed. Diffraction patterns were found and they are explained as Fabry-Perot or Fraunhofer patterns. Surface patterns were investigated, and there seemed to be a close connection between the asymmetric distribution of the active region and the occurrence of off-axis modes. The axial and off-axis modes were found to be polarized in the same plane within experimental error. Threshold and delay times were investigated, and good agreement was found between observed data and approximated theoretical calculations. Finally it was found that the intensity of the axial modes increases at a slower rate with input energy when the off-axis modes start occurring. A qualitative explanation is given for this. Author
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