The results indicate that with suitable inner and outer radius, high reflection can be obtained with short cavity length, and the cavity length does not affect the reflectivity remarkably.

• 结果表明:当反射器的内外半径的选取合适时，反射器可以在较短的长度时获得较大的反射，而且反射系数对反射器长度的变化不敏感。