Abstract
We study the squeezing properties of the light generated by nondegenerate three-level laser in which the three-level atoms are in cascade configuration with degenerate parametric oscillator. We obtain the c-number Langevin equations associated with the normal ordering using the pertinent master equation. Making use of the solutions of the c-number Langevin equations, we calculate the quadrature variances. The results show that the two-mode light produced by the system under consideration is in squeezed state and the squeezing occurs in the minus quadrature. The degree of squeezing increase with the linear gain coefficient and almost perfect squeezing can be obtained for large values of the linear gain coefficient and the atoms initially prepared in lower level slightly greater than in the upper level. Moreover, the presence of nonlinear crystal increases the degree of squeezing for single mode and two-mode lights.  Â
Highlights
Three-level laser is a quantum optical system in which three-level atoms in a cascade configuration, initially prepared in coherent superposition of the top and bottom levels are injected into the cavity coupled to a vacuum reservoir via a single-port mirror
An optical parametric oscillator (OPO) is a quantum optical system most widely used to generate squeezed coherent state and entangled state of light. This quantum optical system consists of a non-linear crystal pumped by coherent light and the cavity modes are coupled to a vacuum reservoir via a single-port mirror
Berihu Tekle has studied the squeezing properties of light produced by degenerate parametric oscillator coupled to squeezed vacuum reservoir and the cavity mode is driven by coherent light
Summary
Three-level laser is a quantum optical system in which three-level atoms in a cascade configuration, initially prepared in coherent superposition of the top and bottom levels are injected into the cavity coupled to a vacuum reservoir via a single-port mirror. An optical parametric oscillator (OPO) is a quantum optical system most widely used to generate squeezed coherent state and entangled state of light This quantum optical system consists of a non-linear crystal pumped by coherent light and the cavity modes are coupled to a vacuum reservoir via a single-port mirror. K has studied the squeezing properties of the light produced by a degenerate three-level laser with the atoms in a closed cavity and pumped by electron bombardment He has shown that the maximum quadrature squeezing of the light generated by the laser, operating far below threshold, is 50% below the coherent-state level. He has shown that the maximum quadrature squeezing of the light generated by the laser, operating far below threshold, is 50% below the coherent-state level. [8] - [ 9]
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