Jafar Jahanpanah
Kharazmi University, Iran
Title: Investigation of distribution mechanism of noise fluxes between three oscillating modes of a free-running class –A laser
Biography
Biography: Jafar Jahanpanah
Abstract
In this paper, the noise aspects of a class-A laser from the single mode state with one cavity damping rate are extended to the more general case of three-mode state with the three equal cavity damping rates.The cavity Langevin force is thus divided into three parts , , and associated with the simultaneous oscillations of cavity left, central, and right modes, respectively. In this way, the phase and amplitude fluctuations of cavity electric field components are analytically calculated by solving the three-mode Maxwell-Bloch equations of motion in the presence of three fluctuating cavity Langevin forces.The correlation functions of three latter cavity Langevin forces are then used to calculate the noise fluxes that are simultaneously superimposed on the mean energy fluxes of oscillating modes in the form of stimulated emission radiation. The most advantage of our calculations is to determine the exact share of each oscillating mode in the total noise flux spectra of laser, spontaneous emission, and pumping of a three-mode class-A laser. The results indicate that the cavity Langevin force of each of three oscillating modes makes a direct contribution in producing the noise fluxes of other two oscillating modes. Our model is finally confirmed by demonstrating a balance relation between the input pumping noise flux and the output noise fluxes of laser and spontaneous emission of three oscillating modes.