Controlling the repetition rate of a mode-locked laser using anf-deformed Bose–Einstein condensate

Abstract

Investigations are made for the possibility of using an f -deformed Bose-Einstein condensate (BEC) inside the resonator of a mode-locked laser to achieve tunable control of the repetition rate. Slow light propagation of the probe field through the f -deformed BEC may lead to a large observable increase in the cavity round-trip delay and, therefore, to a reduction in the effective repetition rate of the laser. Conversely, negative propagation velocity through the f -deformed BEC can lead to a decrease in the cavity round-trip and to an increase in the effective repetition rate. Simulations are presented using an f -deformed BEC of -type three-level atoms beyond the rotating wave approximation. Collisions between the atoms are considered as a special kind of f -deformation where the collision rate κ is regarded as the deformation parameter. In particular, it is found that the repetition rate can be controlled effectively by changing the collision rate κ, the total number of atoms N and the parameter λ for the counter-rotating terms.

Laser pulse amplification and dispersion compensation in an effectively extended optical cavity containing Bose–Einstein condensates

“…To aim at higher intensities and amplification factors, the nonlinear response of the atomic gas should also be taken into account. Denser condensates, with a nonlinear response and quantum corrections, including atomatom interactions, but without local field correction, seem to be beneficial for larger delay times as well [15].…”

“…The promise of laser pulse amplification by atomic condensates is further studied by taking into account atom-atom interactions in an f-deformed condensate formalism very recently [15]. It is found that interactions make the amplification effect stronger.…”