论文标题
在时间域中研究的相位稳定的Terahertz至中形脉冲的光学参数放大
Optical parametric amplification of phase-stable terahertz-to-midinfrared pulses studied in the time domain
论文作者
论文摘要
我们报告了Terahertz（THZ）频率和中红外（MIR）（即16.9至44.8 THz）之间中间区域中低频红外脉冲的光学参数扩增（OPA）。 Yb：kgw再生放大器的255-FS激光输出使用多板扩展方案压缩至11-FS脉冲，该方案在GASE中通过Intra-P1ulse差异频率（DFG）生成了频谱扩展到大约50 Thz的Thz-to-miR脉冲。使用GASE中的两阶段OPA进一步扩增THz-MIR脉冲。 OPA期间的时间动力学和光载体效应在时域中表征。由于脉冲内DFG，两阶段OPA后Thz-to-mir脉冲的长期漂移在6小时的操作中无需任何主动反馈而小至16 mrad。我们使用Pulse内部DFG和放大后的方案提出了一种具有极端相位稳定性的强烈thz-to-mir光源的途径。
We report optical parametric amplification (OPA) of low-frequency infrared pulses in the intermediate region between terahertz (THz) frequency and mid-infrared (MIR), i.e., from 16.9 to 44.8 THz. The 255-fs laser output of the Yb:KGW regenerative amplifier is compressed to 11-fs pulses using a multi-plate broadening scheme, which generates THz-to-MIR pulses with a spectrum extending to approximately 50 THz by intra-p1ulse differential frequency generation (DFG) in GaSe. The THz-to-MIR pulses are further amplified using a two-stage OPA in GaSe. The temporal dynamics and photocarrier effects during OPA are characterized in the time domain. Owing to the intra-pulse DFG, the long-term phase drift of the THz-to-MIR pulses after two-stage OPA is as small as 16 mrad during a 6-h operation without any active feedback. Our scheme using the intra-pulse DFG and post-amplification proposes a new route to intense THz-to-MIR light sources with extreme phase stability.
