Author Affiliations
Abstract
1 College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2 Wuhan Yangtze Soton Laser Photonics Co., Ltd., Wuhan 430205, China
Cylindrical vector beams (CVBs), with non-uniform state of polarizations, have become an indispensable tool in many areas of science and technology. However, little research has explored high power CVBs at the femtosecond regime. In this paper, we report on the generation of high quality CVBs with high peak power and femtosecond pulse duration in a fiber chirped-pulse amplification laser system. The radially (azimuthally) polarized vector beam has been obtained with a pulse duration of 440 fs (430 fs) and a maximum average output power of 20.36 W (20.12 W). The maximum output pulse energy is 20 μJ at a repetition rate of 1 MHz, corresponding to a high peak power of 46 MW. The comparison between simulated intensity profiles and measured experimental results suggests that the generated CVBs have a remarkable intensity distribution. The proposed configuration of our laser system provides a promising solution for high quality CVBs generation with the characteristics of high peak power, ultrashort pulse duration, and high mode purity.
femtosecond laser structural beams pulse shaping amplifier 
Chinese Optics Letters
2022, 20(3): 031405
作者单位
摘要
1 深圳大学物理与光电工程学院深圳市激光工程重点实验室, 广东 深圳 518060
2 武汉安扬激光技术有限责任公司, 湖北 武汉 430000
3 国防科技大学文理学院, 湖南 长沙 410073
当面向高功率径向偏振场激光的产生和传导时,在光纤内实现高的模式区分度与大的模场面积一直是核心的技术挑战。基于此,提出一种全新的径向偏振场光纤设计方案,通过在纤芯内部引入圆对称的径向分布热应力场,使得纤芯内形成径向双折射效应,有效打破常规光纤中偏振模式之间的简并,使TM01模、TE01模和HE21模的有效折射率差为10 -4量级,从而将TM01径向偏振模区分出来。同时,此类径向偏振场光纤更易实现TM01模场的大模面积设计。
光学器件 径向偏振场 应力双折射 光纤 
中国激光
2020, 47(1): 0101005

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