Kobayashi Tetsuro
Science and Technology Entrepreneurship Laboratory, Osaka University, 2-1 Yamadagaoka, Suita, Osaka, 565-0871, Japan.
Opt Express. 2012 Jul 2;20(14):16033-8. doi: 10.1364/OE.20.016033.
In our previous work we proposed the completely closed optical cavity in which light rays with arbitrary directions are completely confined using total internal reflections by a single wall made of a transparent medium. Recently we have succeeded in the experimental confirmation of our proposal. Here, we will demonstrate the experimental results using a prototype cavity composed of GaP. In the cave 640 nm LED lights are confined and leakage is less than 10(-3). Also, external LED lights are rejected almost 99.9% by the single wall and cannot enter in the cave. Due to the high absorption loss of GaP the Q factor of the cavity is suppressed down and is estimated to be 1.4x10(6). The higher Q (~10(9)) is expected if the lower loss (>1%/cm) materials are usable. This device will be useful for many applications such as laser cavities, optical filters, tanks storing natural solar light, micro darkrooms, etc.
在我们之前的工作中，我们提出了一种完全封闭的光学腔，在该腔中，任意方向的光线通过由透明介质制成的单壁的全内反射被完全限制。最近，我们成功地通过实验证实了我们的提议。在这里，我们将展示使用由GaP组成的原型腔的实验结果。在该腔中，640 nm的LED光被限制，泄漏小于10^(-3)。此外，外部LED光被单壁几乎99.9%地阻挡，无法进入腔内。由于GaP的高吸收损耗，腔的品质因数被压低，估计为1.4×10^6。如果可以使用更低损耗（>1%/cm）的材料，则有望获得更高的品质因数（~10^9）。该器件将对许多应用有用，如激光腔、光学滤波器、储存自然太阳光的容器、微型暗室等。
