A novel holographic data storage (HDS) system with dual-reference beam is proposed. Several servo techniques that
construct a read and write procedure of the HDS system are introduced and experimentally confirmed.
Reflectivity variations during phase-transition between amorphous and crystalline states of a Bi-doped GeTe-Sb2Te3 pseudo-binary compound film is investigated with sub-nanosecond laser pulses using a pump-and-probe technique. We also use a two-laser static tester to estimate the onset time of crystallization under a 2.0-μs-pulse excitation. Experimental results indicate that the formation of a melt-quenched amorphous mark is completed in about one nanosecond, but crystalline mark formation on an as-deposited amorphous region requires several hundred nanoseconds. Simple arguments based on heat diffusion are used to explain the time scale of amorphization and the threshold for creation of a burned-out hole on the phase-change film.
KEYWORDS: Signal to noise ratio, Laser systems engineering, Optical simulations, Modulation, Optical discs, Diffraction, Infinite impulse response filters, Objectives, Signal processing, Data storage
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