Nonlinear transmission of CO2 laser radiation by graphene

作者：Sorochenko V R^*; Obraztsova E D; Rusakov P S; Rybin M G

来源：Quantum Electronics, 2012, 42(10): 907-912.

DOI：10.1070/QE2012v042n10ABEH014924

• graphene
• TEA CO2 laser
• passive mode locking
• nonlinear transmission
• laser ablation

The nonlinear transmission of multilayer (similar to 12 layers) graphene at the wavelength lambda similar to 10 mu m is measured for the first time. The absorption saturation intensity in graphene (similar to 330 kW cm(-2)) and the ablation threshold of its outer layers (similar to 1 MW cm(-2), 0.11 J cm(-2)) under action of a CO2 laser pulse with a duration of 70-85 ns at lambda = 10.55 mu m are determined. The residual absorption of graphene at its partial saturation was 48 % of the initial value. This is significantly smaller than the value measured previously for samples with a close number of layers at lambda = 1.55 mu m (92.3 %-93.8 %). It is shown that the ablation threshold of two graphene layers adjacent to the BaF2 substrate (after successive ablation of outer layers) exceeds 0.27 J cm(-2).

• 出版日期2012