A simple method for pulse contrast enhancement via self-focusing

作     者：Zaharit Refaeli Gilad Marcus Yariv Shamir Zaharit Refaeli;Gilad Marcus;Yariv Shamir

作者机构：Applied Physics DivisionSoreq NRCYavneIsrael Applied Physics InstituteThe Hebrew UniversityThe Edmond J.Safra Campus-Givat RamJerusalemIsrael 

出 版 物：《High Power Laser Science and Engineering》 (高功率激光科学与工程（英文版）)

年 卷 期：2024年第12卷第2期

页      面：51-61页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

主　　题：nonlinear optics pulse contrast self-focusing ultrafast laser 

摘      要：Here we report on a simple-to-implement and cost-effective approach for laser pulse contrast enhancement,based on the χ(3)nonlinear self-focusing *** intentionally induced and gently controlled self-focusing in a thin glass transforms the time-dependent intensity into variation in beam *** by a spatial discriminating filter,only the strongly focused fraction traverses the setup,at the expense of efficiency.A numerical model,accounting for the pulse and material parameters via a Gaussian ABCD matrix,provides an estimate for the instantaneous beam waist and transmission efficiency,which enables us to evaluate the resulting contrast *** estimated contrast enhancement spans between 0.5 and 2.5 orders of magnitude,in conjunction with approximately 25%–90%estimated efficiency,depending on the pulse *** a preliminary experiment we demonstrated the effect with 10s-μJ sub GW regime with approximately 40%efficiency and a contrast improvement of more than or equal to 20 dB.