GHz瓦级全固态克尔透镜锁模Yb:CYA飞秒激光器(特邀)  

GHz Watt-scale All Solid State Kerr Lens Mode-locked Yb:CYA Femtosecond Laser(Invited)

作　　者：马骏逸 赵国栋 邵晓东 韩海年[1,3] 魏志义 MA Junyi;ZHAO Guodong;SHAO Xiaodong;HAN Hainian;WEI Zhiyi(Key Laboratory of Photophysics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan,Guangdong 523808,China)

机构地区：[1]中国科学院物理研究所光物理重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]松山湖材料实验室,广东东莞523808

出　　处：《光子学报》2022年第10期105-111,共7页Acta Photonica Sinica

基　　金：中国科学院战略重点研究计划(Nos.XDA1502040404,XDB21010404)。

摘　　要：掺镱氯酸钆钙(Yb:CaYAlO_(4),简称Yb:CYA)晶体具有生长容易、增益曲线宽广平坦以及比热容高和导热性好等优点,是产生飞秒超短脉冲的优异介质晶体。本文介绍了一种基于Yb:CYA晶体的全固态克尔透镜锁模GHz飞秒振荡器,采用功率为8 W的980 nm光纤激光作为泵浦源,腔型为四镜环形腔结构,Yb:CYA晶体厚度为3 mm。该振荡器能够产生中心波长1051 nm、平均输出功率1.7 W的GHz飞秒脉冲,脉冲宽度为207 fs。基于Yb:CYA晶体的振荡器实现了GHz重频瓦级飞秒脉冲输出,为进一步基于此振荡器实现高重频飞秒光学频率梳打下了坚实基础。Great emphasis has been placed on the development of GHz femtosecond lasers for the Ybdoped All-Solid-State Laser(ASSL)that has important application values in many fields such as precision measurement.Compared to general femtosecond oscillators with repetition frequencies in the tens to hundreds of megahertz,GHz femtosecond pulse has been demonstrated to have larger spacing between adjacent longitudinal modes and higher single longitudinal mode power.This GHz repetition frequency femtosecond oscillator is realized by passive mode-locking techniques,including Semiconductor Saturable Absorption Mirror(SESAM)and Kerr Lens Mode-locking(KLM).The latter has the following advantages:simplicity,very fast response,self-starting and self-sustaining.Ytterbium-doped gadolinium calcium chlorate(Yb:CaYAlO_(4),referred to as Yb:CYA)crystal has the advantages of easy growth,broad and flat gain curve,high specific heat capacity,good thermal conductivity,etc.It is an excellent dielectric crystal for generating femtosecond ultrashort pulses.Femtosecond laser pulses based on Yb:CYA crystals were first reported in 2011.In 2018,MA Jie et al.of Jiangsu Normal University reported that the shortest pulse width of Yb:CYA oscillators was 21 fs with the help of two SF10 prisms,while the highest output and peak power achieved by Yb:CYA crystals was experimentally realized by TIAN Wenlong et al.from Xidian University.The Yb:CYA optical frequency comb debuted in 2016,demonstrating the first Kerr lens mode-locked solid-state optical frequency comb in the 1μm band.In 2019,the author's research group achieved for the first time that a watt-scale solid-state Yb:CYA femtosecond laser frequency comb is fully locked to the carrier envelope phase shift frequency and repetition frequency,with a pulse width of 54 fs and an average power of 1.5 W.The free-running carrier-envelope offset(f_(ceo))was observed with a signal-to-noise ratio of 40 dB at 100 kHz resolution bandwidth,and the residual phase jitter of the f_(ceo) after locking was only 370 mrad.

关 键 词：Yb:CYA GHz重复频率 全固态飞秒振荡器 克尔透镜锁模 光学频率梳 

分 类 号：O43[机械工程—光学工程]