Polarization echo spectroscopy of the 0 ↔ 1 transition in ytterbium vapour

Abstract

Our research into photon echo (PE) and stimulated photon echo (SPE) in ytterbium vapour at the transition 0 ↔ 1 is summarized. We present the polarization properties of PE and SPE in pure gas, anisotropy of collision relaxation, collision-induced PE and collisioninduced SPE.

Collision-induced stimulated photon echo on the broad spectral line

“…In the case of broad spectral line and large areas (23) of exciting pulses, like in the case of narrow spectral line, the dependence of the intensity of the collision-induced stimulated photon echo on the exciting-pulse areas reveals harmonic oscillations. In the case of broad spectral line and intermediate areas of exciting pulses, which usual the experiments [7][8][9], this dependence also reveals oscillations but with increasing amplitude, the intensity maximums being obtained at the area values close to those characteristic for narrow spectral line, the shift constitutes an amount of about 1%.…”

“…the echo temporal shape and its dependence on excitingpulse areas is described by the same function (20) as in the case of the narrow spectral line. However in the experiments [7][8][9] the spectral line was broad (kuT 16 n ) and the areas of the exciting pulses (on the order of 10 n θ π ) were neither small nor large. In this case the integral (11) may be evaluated only numerically.…”

“…The dependence of the intensity of the collision-induced stimulated photon echo on the strength of the external magnetic field may be employed for measuring the difference in the alignment and orientation relaxation rates of the excited atomic level, though the application of the formulae, derived for the narrow spectral line, under the conditions of the broad spectral line and intermediate areas of exciting pulses, as in the experiments [7][8][9], introduces an additional error of about 10%.…”

“…The experimental study of the collision-induced stimulated photon echo was carried out in a series of experiments [7][8][9] performed in the ytterbium ( 174 Yb) vapor on the transition S P…”

Collision-induced photon echo in ytterbium vapour at the transition 0–1: magnetic field effect

“…The experimental scheme was modified since our first experimental results of collision-induced photon echo in zero magnetic field [7,11]. The second harmonic radiation of Nd 3+ :YAG laser provided the optical pumping of the pulsed Rhodamine 110 dye laser; a detailed description of the latest laser version was done in [12]. The radiation wavelength was controlled and allowed the fine-tuning into the resonance with the above-mentioned 174 Yb transition.…”