用棱镜耦合法测得了该薄膜的有效折射率为2。 0452。
The effective refractive index is 2.0452, which was measured by prism coupler method.
棱镜耦合器的一个不方便的地方是棱镜材料必须有较高的折射率。
An inconvenience of prism couplers is that the prism material must have a high refractive index.
介绍了微型棱镜耦合的原理和具体使用方法，理论计算所得的耦合效率约为90 %。
The mechanism and the application method was first introduced, then the theoretical coupling efficiency was given (about 90%).
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