Optical characterization of antirelaxation coatings

Optical control of coherent magneto-optical resonances in potassium

“…The experimental setup for investigation of the MOR (figure 1) is similar to the one described in [14]. A circularly polarized laser beam with 2 mm 2 spot of a single mode 766.7 nm DFB diode laser is aligned parallel to the horizontal component of the laboratory magnetic field and passes through an optical cell (8 mm in length and diameter) filled with K and 30 Torr Ne buffer gas to increase the time of interaction of the alkali atoms with the laser beam [15].…”

“…Another Helmholtz coil compensates the vertical component of the laboratory magnetic field (not shown). To investigate LIAD influence on the MOR, the upper part of the temperature control box from [14] is removed, and a LED array is mounted on top of the box, so that the blue desorbing light is directed downwards to the cell. The LED array is cooled by a heatsink and a fan above it to avoid damage of the LEDs by the heat from the heating element of the cell and the heat of the LED array itself.…”

“…In our previous investigations on MOR in Hanle configuration [14], where the laser frequency is fixed at the top of the Doppler broadened profile of the potassium D2 and the magnetic field is scanned linearly in the same direction as the laser beam (the same as in figure 1), it has been shown that the sign of MOR observed in fluorescence perpendicular to the laser beam direction depends on the atomic density. When In figure 3 the EIA resonances with and without LIAD are compared.…”

“…The forementioned properties of LIAD suggest that investigations of LIAD phenomenon might be beneficial for MOR experiments even in a buffer-gas cell [13,14] although as the cell's pureness is presumably high and LIAD effect is not expected to influence the density significantly, but the impact on the depolarization rate of the atoms and their interaction with the cell's surface could be beneficial. The purpose of this work is to investigate the possibilities of optical control of the MOR by LIAD [14 and references therein] in an unshielded potassium buffer-gas cell.…”

“…In previous works [13,14] we have investigated the coherent MOR on the potassium D2 line in Hanle configuration with potassium excited by circularly polarized laser beam in cylindrical cell with length and diameter 8 mm and 30 Torr Ne buffer gas. The capability of the laser system to work with magnetically unshielded cell was demonstrated.…”