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On the Condition for Lossless Propagation in the Light Guide of a Light-Triggered Thyristor

Chen Tao Yu Yuehui Xu Jingping Peng Zhaolian  
The light propagation efficiency of the light guide in the light triggered thyristor(LTT)is discussed. The influence of the diameter and radius of curvature of a light guide on the light propagation efficiency is investigated for a given numerical aperture of a fiber and a given refraction index of the light guide. An inequality that has to be satisfied when the ray is propagated without loss in a light guide can be obtained by the rhom-bohedral mirror method of development in geometrical optics. Calculation results show that the light propagation efficiency of a light guide increases appreciably at the beginning, but gradually approaches a saturated value. The saturated value varies a little with the diameters of two cross cut ends of the light guide. The results of measurement show that the variation of the light propagation efficiency with an increase of the radius of curvature of a light guide is consistent with that obtained by calculation.
【Fund】: 国家自然科学基金资助项目
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