[3] [3] Spielman S, Johnson B V, McDermott G et al.. Using pit-depth modulation to increase capacity and data transfer rate in optical discs[C]. Proc. SPIE, 1997, 3109: 98～104

[4] [4] Nakajima J, Terashima S, Ohta K et al.. Readout of optical disk recorded by pit edge and depth modulation[J]. Jpn. J. Appl. Phys., 2001, 40(3B): 1846～1849

[5] [5] Song Jie, Xu Duanyi, Qi Guosheng et al.. Multilevel read-only optical recording methods[J]. Chin. Phys., 2006, 15(8): 1788～1792

[6] [6] Song J, Ni Y, Xu D Y et al.. Modeling and realization of a multilevel read-only disk[J]. Opt. Exp., 2006, 14(3) : 1199～1207

[7] [7] Bouwhuis G, Braat J, Huijser A. Principle of Optical Disc Systems[M]. Bristol: Adam Hilger Ltd, 1985. 8～20

[8] [8] F. H. Dill, A. R. Neureuther, J. A. Tuttle et al.. Modeling projection printing of positive photoresists[J]. IEEE Trans. Electron. Devices, 1975, 22(7): 456～464

[9] [9] H. Yuan, D. Xu. Q. Zhang et al.. Dynamic model of mastering for multilevel run-length limited read-only disc[J]. Opt. Exp., 2007, 15(7): 4176～4181

[10] [10] H. H. Hopkins. Diffraction theory of laser read-out systems for optical discs[J]. J. Opt. Soc. Am., 1979, 69(1): 4～24

[12] [12] X. F. Cheng, H. B. Jia, D. Y. Xu et al.. Vector diffraction analysis of optical disk readout[J]. Appl. Opt., 2000, 39(34): 6436～6440

[13] [13] Shen Q. H., Xu D. Y.. Analysis of the effects of disk tilt on the differential-phase-detection signal in a high-density DVD read-only disk driver[J]. Appl. Opt., 2006, 45(17): 3998～4004