School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China.
Opt Lett. 2013 Feb 15;38(4):576-8. doi: 10.1364/OL.38.000576.
Nanosecond Čerenkov-type conical beam at 628 nm is obtained by intracavity sum frequency mixing (SFM) of 1064 and 1534 nm in KTiOAsO(4) (KTA) crystal. The 1534 nm signal generated by the KTA optical parametric oscillation (OPO), respectively, interacts with the orthogonally polarized 1064 nm radiations by the nonlinear Čerenkov SFM, emitting two red rings with cone angles of 11.4° and 16.0°, respectively. Multidomain structure observed in the KTA crystal can account for the corresponding phenomenon. The KTA crystal simultaneously serves as OPO medium and Čerenkov radiation emitter in this experiment, indicating that it is a promising multifunctional nonlinear crystal material. Furthermore, the naturally grown crystal combined with intracavity Čerenkov-type configuration will provide a simple and compact approach, opening a door for the wide application of nonlinear Čerenkov radiation sources due to its cost-effectiveness.
纳秒级切伦科夫型锥形光束在 628nm 处，通过腔内和频混合（SFM）的 1064nm 和 1534nm 在钛酸锶钾晶体（KTA）中产生。1534nm 信号分别由 KTA 光参量振荡器（OPO）产生，通过非线性切伦科夫 SFM 与正交偏振的 1064nm 辐射相互作用，分别发射两个具有 11.4°和 16.0°锥形角的红色环。在 KTA 晶体中观察到的多畴结构可以解释相应的现象。在这个实验中，KTA 晶体同时用作 OPO 介质和切伦科夫辐射发射器，表明它是一种有前途的多功能非线性晶体材料。此外，由于其成本效益，结合腔内切伦科夫型配置的天然生长晶体将提供一种简单紧凑的方法，为非线性切伦科夫辐射源的广泛应用开辟了道路。
