Tutsch, R.R.TutschMischo, H.H.MischoPfeifer, T.T.Pfeifer2022-03-082022-03-081999https://publica.fraunhofer.de/handle/publica/304309The method involves using the polarised light from a laser diode [4], which is directed through a collimator lens [5] and an optical deflector [7] to produce a static emission [8] and an oscillating emission [9]. Both of the emissions pass through a polarising decoupling unit, and onto a mirror for deflection at right angles through a quarter wave plate [12] and focal lens [13] positioned above the disc [3]. The static beam is modulated by the oscillating beam responding to information for the tracks [1a,1b,1c]. Preferably the oscillation frequency is at least 1 MHz. USE - For compact discs ADVANTAGE - Provides increased data transfer rate.de608670658patent1996-19636595