Maximization Of Recording Density Obtainable In Te-Alloys

Kees A. Schouhamer Immink; Ronald M. Aarts

doi:10.1117/12.935268

26 October 1983 Maximization Of Recording Density Obtainable In Te-Alloys

Kees A. Schouhamer Immink, Ronald M. Aarts

Proceedings Volume 0396, Advances in Laser Scanning and Recording; (1983) https://doi.org/10.1117/12.935268
Event: 1983 International Technical Conference/Europe, 1983, Geneva, Switzerland

Abstract

We report on high density recording experiments of digital information in Te alloys on pregrooved discs. The recording and reading of information is done on a recorder fitted with an AlGaAs laser. We describe experiments with modulation systems using pit-length modulation based on runlength-limited codes. Runlength-limited sequences were adopted as a modulator output because of the fact that this class of restricted sequences has a great impact in magnetic and optical recording. State-of-the-art high power solid-state lasers can emit a light pulse of sufficient energy for only a limited time and can therefore only be used in a pulsed mode. Pit-length modulation is achieved by adjusting the rotational velocity of the disc and laser pulse write frequency in such a way that oblong pits of overlapping monoholes result. We demonstrate the feasibility of recording densities of up to 1 Mbit/mm2 with the application of pit-length modulation schemes.

Citation Download Citation

Kees A. Schouhamer Immink and Ronald M. Aarts "Maximization Of Recording Density Obtainable In Te-Alloys", Proc. SPIE 0396, Advances in Laser Scanning and Recording, (26 October 1983); https://doi.org/10.1117/12.935268

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