Keller K R, Budweg A, Allerbeck J, Brida D
Opt Lett. 2022 Apr 1;47(7):1594-1597. doi: 10.1364/OL.447295.
In this work we present a compact two-stage optical parametric amplifier (OPA) pumped at degeneracy by the fundamental of a Yb:KGW laser system. The output pulses span from 1.7 to 2.5 µm (120-176 THz) and are compressed to a sub-20 fs duration. This parametric amplifier exploits the broad phase-matching bandwidth at the degeneracy point in bismuth triborate (BiBO) and periodically poled lithium tantalate (PPLT). The result drastically expands the availability of ultrashort pulses with few-microjoule energy from near-infrared (NIR) to even longer wavelengths in the mid-infrared (MIR) spectral region.
在这项工作中，我们展示了一种紧凑的两级光学参量放大器（OPA），它由Yb:KGW激光系统的基频光在简并状态下泵浦。输出脉冲的波长范围为1.7至2.5 µm（120 - 176 THz），并被压缩至20 fs以下的持续时间。这种参量放大器利用了硼酸铋（BiBO）和周期性极化钽酸锂（PPLT）在简并点处的宽相位匹配带宽。该结果极大地扩展了具有几微焦耳能量的超短脉冲在近红外（NIR）到中红外（MIR）光谱区域更长波长的可用性。
