2-μm nonlinear post-compression for generating-100-MHz few-cycle laser pulses with watt-level average power

作者：Shang, J. I. N. G. C. H. E. N. G.; Mei, Chao; Zhao, Shengzhi; Liu, Y. I. Z. H. O. U.; Yang, K. E. J. I. A. N.; Wang, C. H. U. N.; LI, T. A. O.^*; Feng, T. I. A. N. L. I.^*

来源：Optics Express, 2023, 31(2): 1181-1189.

DOI：10.1364/OE.479039

• 2 MU-M
• FIBER LASER
• FS PULSES
• COMPRESSION
• GENERATION
• GW

We firstly report a high pulse repetition rate (101.4 MHz) nonlinear post-compression based on the normal dispersion fiber (NDF) operating in 2-mu m wavelength region. With only one-stage NDF-based nonlinear pulse compressor, the 2-mu m ultrafast laser pulses are compressed from -460 fs down to 70 fs, corresponding to -10.4 optical oscillation cycle. With two-stage nonlinear pulse compressor, the input ultrafast laser pulses are further compressed to 28.3 fs (-4.3 optical oscillation cycle). In each case, the average power of the compressed 2-mu m laser pulses exceeds 1 W, which is believed to be the highest average power never achieved at -100-MHz pulse repetition rate. The efficiencies of the one-stage and two-stage nonlinear pulse compressors are 64% and 47% respectively.

• 单位
  山东大学; 晶体材料国家重点实验室; 北京科技大学