The synthesis and third-order nonlinear optical properties of resonance Benzo[a]phenoxazinium salts

摘要

The third-order nonlinear optical properties of a series of resonance benzo[a]phenoxazinium salts in acetic acid solution were studied using the Z-scan technique employing a Nd:YAG nanosecond laser at 532 nm. The compounds displayed strong reverse absorption with third-order nonlinear optical coefficients of 0.42—1.20 x 10~(-11) esu and second hyperpolarizabilities of 2.75-7.29 x 10~(-29) esu, respectively. Quantum chemical calculations showed that the compound with more stable highest occupied molecular orbital energy also displayed highest second hyperpolarizability.