Acta Photonica Sinica, Volume. 50, Issue 6, 71(2021)
Fabrication of High Temperature Resistant Geometric Phase Element Inside Sapphire by Femtoesecond Laser(Invited)
Aiming at the problems of difficult processing, low precision and poor effect of fabricating geometric phase elements in crystal materials, a femtosecond laser-induced nano-grating technology was proposed to fabricate the internal geometric phase diffraction elements. The femtosecond laser near-threshold processing method effectively improves the processing accuracy and the fabricating accuracy is 340 nm. By adjusting the polarization of the scanning laser, the direction of the induced nano-grating can be accurately controlled, leading to the change of the slow axis direction of the crystalline birefringence. Based on this method, the geometric phase Fresnel zone plate in sapphire has been fabricated. The device has a good morphology with no cracks and excellent optical performance, which can be used for focusing in high-temperature environments.
Get Citation
Copy Citation Text
Yiming LU, Bingrong GAO, Xueqing LIU, Qidai CHEN. Fabrication of High Temperature Resistant Geometric Phase Element Inside Sapphire by Femtoesecond Laser(Invited)[J]. Acta Photonica Sinica, 2021, 50(6): 71
Category: Special Issue for Ultrafast Laser Precision Machining of Hard and Brittle Materials
Received: Apr. 15, 2021
Accepted: Jun. 8, 2021
Published Online: Aug. 31, 2021
The Author Email: