Experimental Study of Phase Contrast Reading out of Three-dimensional Optical Data Storage
相位对比读出三维光数据存储的实验研究

Three dimensional optical data storage in PMMA(ploymethyl metacrtlate) and fused silica is demonstrated by a chirped amplified femtosecond laser pulses at 800 nm,150 fs,1kHz repetition rate. The writing and reading of the bits in 5,10,15 and 20 layers are presented. The signal/noise ratio (S/N) of multi layers bits reading by a phase contrast optical microscope is analyzed experimentally and the phase contrast change of each bits plane is given. The results show that the phase contrast of each layer increases monotonously from interior to surface of the sample, and the contrast of the interior bits planes will be decreased as the number of written layers increased. Due to residual stress in the interaction between femtosecond laser pulse and fused silica, PMMA is more suitable for 3 D optical storage with femtosecond laser pulse.