New mechanism of increasing the refractive index of an optical medium

HE GUANG-SHENG, ZHOU FU-XIN, LIU SONG-HAU +1 more

Using intense pulsed laser beam of 5320 ? to excite the BDN dye solution inside the F-P interferometer, we have found the transient and intrinsic optical bistability effect. The various possible mechanisms to induce the refractive-index change of the sample medium and their relative contributions have been estimated; finally it is confirmed that in the duration of input laser pulse the refractive-index variation increases with time approximately in the form of semi-cubic parabola, and the main mechanism to cause this variation is the opto-thermal effect of the sample medium.

Marco Montecchi, E. Nichelatti, Rosamaria M. Montereali +2 more

Nicholas Proite, Daniel Sikes, Deniz D. Yavuz

К. А. Баранцев, A. N. Litvinov, Georgy A. Kazakov +1 more

This paper examines the refractive index dispersion in an atomic medium with a closed excitation contour. The refractive index as a function of the algebraic sum of the phases of excitation fields (Φ) and Rabi frequencies is shown to have a maximum for Φ ≤ π/4. A frequency range is found near the maximum where an increase in refractive index is accompanied by amplification of one of the optical fields.

К. А. Баранцев, Величко Елена Николаевна, A. N. Litvinov

A theory of a closed contour scheme of excitation ( Δ -scheme) of a three-level atom in an optically dense medium taking into account the effect of temperature is presented. It is shown that spatial quasiperiodic oscillations of the refractive index in this system decay with increasing temperature. The temperature range in which these oscillations are most pronounced is determined.

Robert A. McCutcheon, Susanne F. Yelin