Laser induced crystallisation

Fig. 8. Laser-induced crystallisation on Pt thin films, (a, d) line-like pattern (476mJ/cm ) indicating three different crystalline regions (b, e) lattice-like pattern (709 mj/cm ) (c, f) dotlike structure (859 mj/cm ) with the grains radially distributed (region 3). Reproduced with permission — Copyright Wiley-VCH Verlag GmbH Co. KGaA.

Fig. 2.5. Regions of barium hexaferrite crystals created in a BaO—B2O3—Fe203 glass by laser-induced crystallisation [250]...

The reaction in the gas phase can also be achieved in a plasma or laser induced. The result of this process is an amorphous or only partially crystallised powder with a high specific surface area. 

A further major use for LCPs is in the area of opto-electronics. Their usefulness here arises partly from their ability to incorporate the properties of more conventional liquid crystals, which are fluid at ambient temperatures, within a material that does not need to be confined in a cell. When a small-molecule liquid-crystalline material is cooled to form a solid it usually crystallises in such a way that any structure within it, i.e. orientation of the molecules, is lost. LCPs can, however, form glasses in which orientation induced above the glass transition can be retained. This leads to the possibility, among others, of information-storage devices. For instance, the heating effect of a laser beam, with or without the simulta-... 

The photo-induced microcrystallisation in photosensitive glasses was also investigated [304]. The crystallisation is induced by multi-photon absorption of a fs-laser beam operating in the non-resonant wavelength range. 

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