Abstract
The mode split is studied by rotating an intracavity crystal quartz plate around its normal line by 360°. There is an angle between each two of the surface normal, crystalline axis and laser beam. The frequency split can exceed one or a few longitudinal mode spacing. The larger the angle between the laser beam and normal line, the larger the slope of the curve of split versus rotating angle. The mode split in the range from 0° to + 180° is symmetric with respect to that in the range from 0° to − 180°. Also the shrinkage phenomenon that the mode split decreases with the rotating angle increasing over some angle range, is observed.
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