提出几种计算和测量激光棒负透镜等效焦距的方法。
The authors have reported two methods for measuring the efficient focal distance of the laser rod lenses.
导出透镜的等效焦距，主面、焦面位置以及高斯成象公式。
The formulas for determining the equivalent focal length, principal planes, focal planes as well as the GRIN lens law are derived.
如果exif头信息35毫米等效焦距可供一夹，相机焦距将被自动设置。
IF EXIF header information for a 35mm equivalent focal length is available for a clip, the camera focal length will be set automatically.
如果exif头信息35毫米等效焦距在某一段上是有效的，相机焦距将被自动设置。
IF EXIF header information for a 35mm equivalent focal length is available for a clip, the camera focal length will be set automatically.
本文从光线轨迹方程出发，推导了锥形梯度折射率纤维的物像关系式，并得出了它的等效焦距和主平面位置。
Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.
把激光棒等效为梯度折射率棒，得到了新的热透镜焦距公式。
Based on that the laser rod is equivalent to gradient index rod (GRIN), a new thermal lens focal length expression was achieved.
把激光棒等效为梯度折射率棒，得到了新的热透镜焦距公式。
Based on that the laser rod is equivalent to gradient index rod (GRIN), a new thermal lens focal length expression was achieved.
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