Absorption of edge-cladding Cu-glass for the strong amplified spontaneous emission of Nd-glass disk will produce
a large rise for the temperature and thermal stress near the cladding interface between Cu-glass and Nd-glass.
According to the calculation for amplified spontaneous emission of Nd-glass and thermal stress along the thickness
of Cu-glass, which is produced in our lab, the relations among temperature rise, thermal stress, CuO doping
concentration and thickness of cladding Cu-glass, are discussed in detail. If using 0.10% CuO doping instead of
1%, which was used in the previous time, the maximum temperature will decrease from 46K to 13K and the thermal
stress will decrease from 4.0 MPa to 0.8 MPa. Our edges cladding experimental results, obtained by the low CuO
concentration edge cladding glass, are consistent with the inferences and validated in the SG series laser systems.
Since the first commercial optical disc came out in 1970s, many kinds of optical disc with peculiar format were invented
in sequence, and most of them have win tremendous successes in commercial use all over the world. Each format has its
own characteristics on disc structures, optical parameters, data coding, physical property, storage capacity and more.
Here we give a review on the optical disc formats which represent the mainstream optical disc development since 1970s.
We will discuss on the optical disc formats on basic parameters of optical disc, their application background, their
innovation advantages, their compatibilities and related views.