Mytsyk Bogdan G, Andrushchak Anatoliy S, Demyanyshyn Nataliya M, Kost' Yaroslav P, Kityk Andriy V, Mandracci Pietro, Schranz Wilfried
Karpenko Physico-Mechanical Institute, 5 Naukova Street, 79601 Lviv, Ukraine.
Appl Opt. 2009 Apr 1;48(10):1904-11. doi: 10.1364/ao.48.001904.
We describe an interferometric technique suitable for determination of piezo-optic coefficients (POCs) in crystals. The method considers real nonparallelism of measured samples, thereby improving the measuring precision of POCs significantly. Corresponding equations are derived for the interferometric half-wave stress method. Using this technique we have determined a complete set of POCs of pure and MgO-doped LiNbO(3) crystals. The reliability of the data has been confirmed by comparing the effective POCs expressed through the combinations of measured POCs and the effective POCs determined independently using highly precise optical birefringence measurements. Pure and MgO-doped LiNbO(3) crystals reveal nearly the same magnitudes of POCs. However, LiNbO(3):MgO exhibits about 4 times higher resistance with respect to powerful light radiation, making it more suitable for application in acousto-optic devices that deal with superpowerful laser radiation.
我们描述了一种适用于测定晶体中压电光学系数（POC）的干涉测量技术。该方法考虑了被测样品实际存在的不平行度，从而显著提高了POC的测量精度。推导了干涉半波应力法的相应方程。利用该技术，我们测定了纯LiNbO(3)晶体和MgO掺杂LiNbO(3)晶体的一整套POC。通过比较由测量得到的POC组合表示的有效POC与使用高精度光学双折射测量独立确定的有效POC，证实了数据的可靠性。纯LiNbO(3)晶体和MgO掺杂LiNbO(3)晶体的POC大小几乎相同。然而，LiNbO(3):MgO在强光辐射下的抗性约高4倍，使其更适合应用于处理超强激光辐射的声光器件。
