PROBLEM TO BE SOLVED: To enable multi-layered by making use of a Bessel beam SOLUTION: When collimating a laser light from a laser diode 1 into parallel light by a collimator lens 3 and converting it into an annular beam through a liquid crystal shutter panel 10, this optical head selectively turns ON and OFF respective annular parts of the liquid crystal shutter panel 10 to vary the diameter of the annular light beam, thereby enabling the depth-direction multi-layered recording of a recording medium 7 COPYRIGHT: (C)1999,JPO

An optical scanning device for scanning an optical record carrier. The optical scanning device includes: a radiation source system (661; 761); an optical element (1; 101; 201; 301) comprising a first fluid (A) and a second fluid (B; C) separated from each other by a fluid meniscus (16; 116, 138; 216; 316) having an adjustable configuration; and a control system (20; 120; 220; 320) arranged to adjust the fluid meniscus configuration to introduce a first type of wavefront modification. The first type of wavefront modification causes the radiation beam to be redirected from an input radiation beam path (2; 102; 244; 348) onto one of a plurality of output radiation beam paths (24, 26; 140; 246; 350) which each have a different angular displacement (α, β, Ϝ, δ, e) from the input radiation beam path. The control system is further arranged to adjust the fluid meniscus configuration to introduce a second type of wavefront modification. The second type of wavefront modification is arranged to compensate a wavefront aberration of the radiation beam, the compensated wavefront aberration being adjusted in accordance with the angular displacement.

Optical head for multi-layered recording

Optical Scanning Device

The core of me invention is a method and apparatus for transformation of matter parameters through optical way. In course of this method we create a multilateral pattern inside sample matter through specific imaging beam issued by a light emitting device. The most significant application of the suggested method is for writing on optic data storage media. Further application concerns the analysis of the above-mentioned optical parameters, i.e. reading data from the storage media.

Optical head for multi-layered recording

Citations

Optical Scanning Device

Multiplexed data storage method

Device for generating a Bessel light beam bundle with at least one electro-optical element

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