In the field of telescope applications, it needs to adjust the focus to get clearer image of objects at different distance. Novel design of focus adjusting apparatus with long journey is presented here. This apparatus has long journey of second mirror extended to 20mm. And its adjusting precision is about 0.1μm. This apparatus can be controlled with two modes. One mode is manual control. The other mode is automatic control. The design can be applied to the fields of telescopes which needs long adjusting range and high precision.
In the field of laser applications, it needs to know the optical characters of sea’s atmosphere. By referring, measuring and theoretically studying, the optical characters of atmosphere of China’s sea are studied herein. These optical characters are mainly about Cn2, and visibility, and so on. And the differences between sea and earth are compared with their optical characters. Then, some basic and important conclusions are made.
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