Optical and DC-electric poling on AgX (X = Cl, I)-Doped chalcohalide glasses

Abstract

The influence of the simultaneous polarized optical treatment (10-ns Nd:YAG lasers with a poser density of 3.6 GW/cm²) together with an electrostatic DC-electric field (up to 8 kV/cm) on GeS₂-Ga₂S₃-AgX (X = Cl, I) and GeS₂-Ga₂S₃-KBr chalcohalide glasses is explored. The maximal second-order susceptibility (SOS) was achieved for the AgI-doped specimen. In samples without silver halides, however, the SOS was below 0.25 pm/V. This fact may indicate the principal role of the high polarizability of Ag⁺ ions in the enhanced SOS. A common feature for all three glasses is that the SOS achieves maximal values after one minute of simultaneous DC-electrical optical treatment. Further treatment will not enhance the SOS values and can even lead to its decrease by several times. The independent measurement of the local temperature shows that local heating does not excess 5°–7°.