**Fluorite Crystals with Color Centers: A Medium for Recording Extremely Stable but Broadly Transformable Holograms Fluorite Crystals with Color Centers: A Medium for Recording Extremely Stable but Broadly Transformable Holograms**

Aleksandr I. Ryskin, Aleksandr E. Angervaks and Andrei V. Veniaminov Andrei V. Veniaminov Additional information is available at the end of the chapter

Aleksandr I. Ryskin, Aleksandr E. Angervaks and

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/66114

#### **Abstract**

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The mechanisms of (i) forming the photochromic color centers in fluorite crystals ("additive coloring") and (ii) recording and transforming holograms through the use of their photochromism are described here. The diffusion‐drift mechanism of hologram recording in additively colored fluorite crystals determines the recording kinetics and properties of holograms. An important feature of holograms recorded in additively colored fluorite is an opportunity to perform the photothermal transformation of color centers under the incoherent optical radiation that results in nondestructive switching of the hologram between the amplitude, amplitude‐phase (in‐phase or counter‐phase), and phase types at a given readout wavelength. Possible applications of holographic elements based on the additively colored fluorite crystals are discussed.

**Keywords:** fluorite crystal, additive coloring, color center, colloids, transformation, holography, diffraction efficiency, kinetics, profile
