Collimating and beam shaping system for BD optical pick-up

Abstract

In Blu-ray Disc Optical Pick-up, the collimating and beam shaping play a significant role for laser beam process. So this paper firstly gives out a collimating and beam shaping system according to China manufacture situation. And then based on Laser Optics and Fourier Optics, this paper improves the calculation method of energy coupling efficiency for collimator lens. At last, it builds a simple Interference Instrument which is used for adjusting the collimator lens and beam shaper. This apparatus is built based on the theory of interference theory. The simplest example of an electromagnetic wave is the plane wave. The plane wave is produced by a monochromatic point source at infinity and is approximated by a collimated light source. Here the paper uses this Interference Instrument to assemble the collimator lens with laser diode and check the quality of the beam shaping. Meanwhile this collimating and beam shaping system can be produced easily in China, as it is suitable for Chinese optical element manufacture skill lever and can be precise assembled by using simple instruments. So it will make that producing BD OPU in China with a lower cost comes true.