Generation of third harmonic emission in propagation of femtosecond laser pulses in air

• 来源期刊: 中国物理（英文版）
• 关键词: third harmonic emission plasma channel
• 年，卷（期）: 2006,（9）
• 页码范围: 2025-2029
• 页数: 5页
• 语种: 英文

摘要

The main characteristics of the third harmonic emission generated by femtosecond laser pulses propagating in air are investigated by numerically solving the coupled nonlinear Schr(o)dinger equations. Strong third harmonic emission is observed with a maximum conversion efficiency as high as 0.43%. The on-axis phase difference between fundamental beam and third harmonic is investigated. The result is in good agreement with the phase-locking mechanism. Dependence of the conversion of third harmonic emission on focusing conditions is also studied. The results are also compared with those of experiments.