Linear and quadratic behaviors in a two-level laser

Babak Parvin

Gao‐xiang Li, PENG JIN-SHENG, Peng Zhou

We have studied the steady-state behavior of a cascade three-level atom in a two-mode bad cavity which is parametrically driven by a classical field. In the weak field limit, it has been found that the atomic population trapping in the upper-level depends on the cavity photon number not only linearly but also quadratically, and the atomic dipole squeezing can occur.

Babak Parvin

Chaotic behavior of laser oscillation is investigated by numerical calculation of quantum statistical equation of laser field, for the case of single mode and two-level systems. Relaxation-like distribution of laser field is expected from the quantum property of light. Further, coupled spin operators which are the base of atomic two-level system is investigated in expectation of chaotic behavior that might be origin of laser chaos.

Fatemeh Ahmadinouri, Mehdi Hosseini, Farrokh Sarreshtedari

Abstract We have proposed and demonstrated a fast and robust method of population transfer between two quantum states using a quadratically chirped laser source. Numerically solving the time-dependent Schrödinger equation, transition probabilities have been obtained and the condition of the adiabatic passage is investigated. In this scheme, the wavelength of a laser source is quadratically swept in time to arbitrarily engineer the transition probabilities. The results show that complete and robust population transfer could be achieved by appropriate adjusting of the system parameters including the laser chirping parameter, the center frequency, and the coupling strength. Using this method, the time of the complete transition could be drastically decreased compared to the incorporation of the traditional linearly chirped laser.

Donna Maree Sheppard