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Chinese Optics Letters, Vol. 17, Issue 4, 041404-1 (2019)

Hybrid femtosecond laser system based on a Yb:KGW regenerative amplifier for NP polarization

Dongyu Yan1, Bowen Liu1, Yuxi Chu1,*, Huanyu Song1, Lu Chai1, Minglie Hu1, and Chingyue Wang1

Author Affiliations

  • 1Ultrafast Laser Laboratory, Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China


We report a hybrid femtosecond laser system based on a femtosecond Yb-doped fiber laser and a Yb-doped potassium gadolinium tungstate (Yb:KGW) regenerative amplifier. To match the central wavelength of the seed source, a Yb:KGW crystal is used in the regenerative amplifier for Np polarization. We study and optimize the dynamics of nonlinear amplification to alleviate the gain narrowing effect. With optimization, the system can output 270 fs pulses with 21μJ pulse energy at a 60 kHz repetition rate.