Patent ID: 7985489
Filing Date: 2011-07-26
Classification: G02B

Abstract:
1. A thin film interference filter having a thermally stressable element with at least one layer, said filter comprising: alternating layers of at least a first and at least a second material in the at least one layer, and a mixture profile of the alternating layers of the first and second material in the at least one layer that varies at least approximately continuously with a layer thickness, without the formation of an interface layer between the alternating layers of the first and second material, whereby the at least one layer presents a lower crystallization capacity in comparison with a layer of approximately the same thickness with discrete successive partial layers made up of the first and the second material, whereby in at least one light spectral range, the first material presents a first refractive index and the second material presents a second refractive index that is different from the first refractive index, and the layer presents a refractive index profile that varies continuously with the layer thickness.