| 摘要 |
The invention relates to an optical storage medium comprising below an entrance face (EF) a higher recording stack (ST<SUB>0</SUB>) comprising a higher recording layer (L<SUB>0</SUB>) and at least a lower recording stack (ST<SUB>1</SUB>), said lower recording stack (ST<SUB>1</SUB>) being recorded or read back by a radiation beam ( 4 ) entering into the optical storage medium through the entrance face (EF) with a wavelength (lambda), focused on said lower recording stack (ST<SUB>1</SUB>) and transmitted through the higher recording stack (ST<SUB>0</SUB>), a recording of the higher recording layer (L<SUB>0</SUB>) causing an optical thickness variation between recorded and unrecorded areas of said first recording layer (L<SUB>0</SUB>), which is included into the range [0.03lambda, 0.125lambda]. |
