Stable cascaded femtosecond optical parametric amplifiers in the NIR-I region at 50 MHz  

作　　者：Xiaoxuan Zhu Jue Wang Xuechen Gao Jintao Fan Minglie Hu 朱晓璇;王珏;高雪晨;范锦涛;胡明列

机构地区：[1]Ultrafast Laser Laboratory,Key Laboratory of Opto-electronic Information Technical Science of Ministry of Education,School of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Chinese Optics Letters》2025年第1期107-112,共6页中国光学快报(英文版)

基　　金：supported by the National Key R&D Program of China(No.2023YFB3611000);the National Natural Science Foundation of China(Nos.62105237 and 62227821)。

摘　　要：We experimentally demonstrate a continuous-wave(CW)injection-seeded cascaded optical parametric amplifier(OPA)for generating femtosecond pulses in the NIR-I spectral region.Utilizing a cascaded two-stage configuration,our system achieves an output of 347 m W of NIR radiation centered at 792 nm,combined with a pulse duration of 171 fs at a repetition rate of 50 MHz.The CW seeding intrinsically ensures superior pulse-to-pulse and long-term power stability.Our measurements indicate a relative intensity noise(RIN)of 2.2%root mean square(RMS)(integrated from 3.3 Hz to 2.5 MHz)and an RMS power stability as low as 0.63%over a duration of 90 min.Moreover,the beam quality of the output beam is neardiffraction-limited,with M^(2)factors of M_(X)^(2)=1.11 and M_(Y)^(2)=1.29.We believe that this type of laser source is capable of delivering stable femtosecond pulses within the NIR-I spectral range and can serve as an ideal solution for various applications including biophotonics,microscopy,and laser processing.

关 键 词：continuous-wave injection cascaded optical parametric amplifier superior power stability high beam quality 

分 类 号：TN722[电子电信—电路与系统]