Kabessa Yossef, Yativ Amir, Ilan Har'el, Agranat Aharon J
Opt Express. 2015 Feb 23;23(4):4348-56. doi: 10.1364/OE.23.004348.
A method for suppressing the formation of optical damage in quadratic electrooptic devices operated at short wavelengths is presented. Formation of optical damage is attributed to the generation of a trapped space charge induced by photoionization of impurity ions by the propagating beam. It is shown that in potassium lithium tantalate niobate where the electrooptic effect is quadratic, operating the electrooptic device by a bipolar driving voltage prevents the space charge from accumulating, which inhibits the formation of the optical damage. A 6 hours continuous operation of electrooptic modulator for a 30 W/cm(2) at λ = 445 nm input beam is demonstrated.
本文提出了一种抑制在短波长下工作的二次电光器件中光学损伤形成的方法。光学损伤的形成归因于杂质离子被传播光束光致电离所诱导的俘获空间电荷的产生。结果表明，在铌酸锂钽酸钾这种电光效应为二次效应的材料中，通过双极驱动电压操作电光器件可防止空间电荷积累，从而抑制光学损伤的形成。演示了在波长λ = 445 nm、输入光束功率为30 W/cm²的情况下，电光调制器连续运行6小时的情况。
