Scaling Holograms

Hologram Scaling with Wavelength

波长与全息图的缩放

Experimenters:Bob Gobron, Kiyra Holt, David Patton

实验者：Bob Gobron, Kiyra Holt, David Patton

One of the unique properties of holograms is that the size of the viewed image scales with the wavelength of the viewing light. At left is a view of a hologram of the end of a pipe formed with light from a mercury vapor tube. The mercury source has three prominent wavelengths and you can see three distinct images of different size.

全息图的一个独特特性是，所观察到的图像大小与观看光的波长成正比。左侧是一张由汞蒸气灯发出的光形成的管道末端的全息图。汞源有三个显著的波长，你可以看到三个大小不同的图像。

Measuring the relative size of the images compared to the blue image (435.8 nm) gives 1.26 for the green (546.1 nm) and 1.36 for the yellow-orange image (576.9 and 579.1 nm). The scaling of the wavelengths relative to the blue wavelength gives 1.25 for the green and an average of 1.33 for the yellow-orange lines, so the image sizes appear to scale with the wavelength.

将绿色（546.1 nm）和黄色橙色图像（576.9 和 579.1 nm）与蓝色图像（435.8 nm）的相对尺寸比较，得到绿色为1.26，黄色橙色为1.36。将波长相对于蓝色波长进行缩放，得到绿色为1.25，黄色橙色平均为1.33，因此图像尺寸似乎与波长成正比。

Mercury spectrum

The lower image shows the same hologram viewed with the mercury source filtered by an interference filter which transmits only the mercury green line.

下图显示的是使用汞光源通过干涉滤光片过滤后的同一全息图。

水银光谱

The direct viewing of a hologram with mercury light illustrates a unique feature of the blue vision of the human eye compared to that for red and green. Because of distinctions with the blue cones of the eye and a bit of chromatic aberration in the eye, the blue image will look less distinct than the green and orange image. The effect must be viewed directly; the way the image is made in this illustration mixes in enough other colors to remove the effect.

用汞光直接观察全息图，展示了人眼对蓝光的视觉特性，这与对红光和绿光的视觉特性不同。由于人眼蓝锥细胞的差异以及眼睛中存在一定程度的色差，蓝光图像将显得不如绿光和橙光图像清晰。这种效应必须直接观察；本图示中图像的制作方式混合了足够的其他颜色以消除这种效应。