A comparative study of parameters of semiclassical theory of laser

摘要

Semiclassical treatment of lasers gives the details of theoretical methodology followed along with the semiclassical theory of laser action as preceded by Lamb and co-workers in this work. This theory has explained successfully about Lamb dip which led a variety of stabilization schemes. A medium with population inversion is capable of amplification. A feedback of energy into the system is brought about by placing the active medium between a pair of mirrors which are facing each other. The semiclassical theory has been discussed with the complex conjugate terms only and also with both complex conjugate terms and real terms. Gain and dispersion relations are worked out. It has been shown that the depth of the spatial hole increases as the value of the dimensionless intensity at a particular value of z versus the normalized population difference. This observation was not indicated in the original work of Lamb. Considering the complex conjugate terms in calculation of the basic equations some interesting result was found, which leads to a meaningful physical interpretation of the calculation. A direct relationship between polarization and refractive index of the lasing medium is established. It may be inferred from the calculations that the complex conjugate terms do have some effect which leads to a different value. As the gain and dispersion relations are changed, it can be utilized to calculate other parameters of different quantum electronic devices like Ring, Zeeman lasers etc. related to semi classical theory of laser