光子筛是一种由大量小孔构成的衍射元件，其上面的每个小孔对聚焦都有贡献。
A photon sieve can be composed of a large number of circular pinholes. Each circular pinhole has a contribution to the focusing.
双光子吸收在聚焦光束扫描存储技术中的应用；
Second, application of two photon absorption to three dimension density optical data storage is described.
提出利用聚焦准直器代替单个准直器以达到增大探测器接收到的散射光子通量的目的。
Focusing collimators were used instead of single collimator to increase the scattering photon flux received by detector.
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