If you only want the caustics to be rendered, select this output.You can choose if you either want to go for quality or render speed by using different outputs.This feature is still being tested and developed works for some objects.A non volumetric absorption method for faster rendering compared to volume absorption the caustic colors are less detailed.Choose which color should be absorbed as the light passes through the glass.The anisotropy affects the direction in which the light is scattered.Choose which color should be scattered as the light passes through the glass.Have you ever seen these rainbow like lights on the ground when the sun is shining through your windows? With this slider you can chose how many colors are refracted on the ground.
If you leave it white (#FFFFFF) the caustics will automatically be generated. Color your caustics independent of the glass's color. For more variation and details in your caustics adjust these values. Customize the amount of caustics you want in your scene. Separates the light into its primary colors. We do not need this feature because we fake the caustics. You can turn off the reflective and refractive caustics under light paths in your render settings to reduce fireflies. But who cares as long as the results are good? Please note that the caustics are still fake, because real caustics are simply not possible with Cycles. With our Realistic Glass Shader you have full control over all parameters you could possibly need for creating awesome looking renders you would previously have used Blender's built-in glass shader for, e.g. This means it is not possible to get physically accurate caustics or dispersion. Why? Because the Cycles Render Engine does not use bidirectional rendering. If you compare the results you get with the default glass shader with reference images, you will probably notice that it is not possible to get completely photorealistic results this way. Have you ever tried to create some realistic looking glass renders in Blender? Since this is a relatively new feature please let me know if you encounter any bugs. 
Now with the option to control the influence through internal caustics for maximum artistic freedom.
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