Investigation On795nm Vertical-cavity Surface-emitting Laser

The first Vertical-cavity surface-emitting laser(VCSEL) came into being in1978, since when it has developed rapidly. Although it came later than the Edge-Emitting Semiconductor Laser, due to its advantages such as low-threshold current, easiness to realize single-longitudinal-mode operation, large modulation bandwidth, low price, easiness of coupe fiber coupling and of integration etc., the VCSEL dominated the semiconductor laser market soon and has become the most potential semiconductor laser at present. In particular, the important role it is playing in the field of optical communications determines its unshakable leading position.With the application of VCSELs expanding to various fields, our laboratory has also imported VCSELs, which have replaced the former external cavity lasers and become the light source of atomic magnetometers. The introduction of VCSELs has injected new vitality into our lab. Thanks to its small size, low price and good performance, our lab soon succeeded in making the atomic magnetometer smaller and portable and also improving its performance a lot such as sensitivity two years after the introduction of VCSELs. However, there have not been any systematic research on theories about the VCSEL and its output characteristics. So through researching some theoretical basis of the VCSEL and its output characteristics. So through researching some theoretical basis of the VCSEL and testing its output characteristics, this paper intends to lay foundations for applying VCSELs and expects to provide some guidelines for experiments, improve the performance of the atomic magnetometer and finally improve its sensitivity.Chapter1briefly introduces the background of VCSELs, including its development history, merits and demerits, as well as fundamental structure. Chapter2reviews the theories on the photoelectric model, theoretical model and spin polarization inversion model output by the VCSEL. Testing methods on VCSELs are presented in chapter3and also a theoretical analysis is made to judge whether it is suitable for atomic magnetometers. At last, a brief summary of the research is made and the direction of further researches on VCSELs is made clear.