Toward 5.2μm terawatt few-cycle pulses via optical parametric chirped-pulse amplification with oxide La3Ga5.5Nb0.5O14crystals  

作　　者：Jinsheng Liu Jingui Ma Jing Wang Peng Yuan Guoqiang Xie Liejia Qian 

机构地区：[1]Key Laboratory for Laser Plasmas(Ministry of Education),Collaborative Innovation Centre of IFSA(CICIFSA),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《High Power Laser Science and Engineering》2019年第4期21-32,共12页高功率激光科学与工程（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Nos.61705128;61727820 and 91850203);Science and Technology Commission of Shanghai Municipality(Nos.17YF1409100 and17ZR1414000)。

摘　　要：High-power femtosecond lasers beyond 5μm are attractive for strong-field physics with mid-infrared(IR)fields but are difficult to scale up.In optical parametric chirped-pulse amplification(OPCPA)at mid-IR wavelengths,a nonlinear crystal is vital,and its transmittance,dispersion,nonlinear coefficient and size determine the achievable power and wavelength.OPCPA beyond 5μm routinely relies on semiconductor crystals because common oxide crystals are not transparent in this spectral range.However,the small size and low damage threshold of semiconductor crystals fundamentally limit the peak power to gigawatts.In this paper,we design a terawatt-class OPCPA system at 5.2μm based on a new kind of oxide crystal of La3Ga5.5Nb0.5O14(LGN).The extended transparent range,high damage threshold,superior phase-matching characteristics and large size of LGN enable the generation of 0.13 TW seven-cycle pulses at5.2μm.This design fully relies on the state-of-the-art OPCPA technology of an octave-spanning ultrafast Ti:sapphire laser and a thin-disk Yb:YAG laser,offering the performance characteristics of high power,a high repetition rate and a stable carrier-envelope phase.

关 键 词：FEW-CYCLE MID-INFRARED OPCPA oxide LGN crystals 

分 类 号：O614.331[理学—无机化学] TN24[理学—化学]