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给出了两种改进的Ｚ－ｓｃａｎ方法．它们较通常的Ｚ－ｓｃａｎ方法具有更高的灵敏度。利用这两种方法，对溶液的热致非线性进行了测量，实验与理论符合得较好。In this paper we suggest two modified Z-scan methods with enhanced sensitivity compared with common Z-scan method. By using these methods we measure thermally induced nonlinearity of liquid. The experimental results agree essentially with the theories.
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