Few–cycle short–wave infrared (SWIR) pulses are useful tools for research on strong–field physics and nonlinear optics. Here we demonstrate the amplification of sub–cycle pulses in the SWIR region by using a cascaded BBO–based optical parametric amplifier (OPA) chain. By virtue of the tailored wavelength of the pump pulse of 708 nm, we successfully obtained a gain bandwidth of more than one octave for a BBO crystal. The division and synthesis of the spectral components of the pulse in a Mach–Zehnder–type interferometer set in front of the final amplifier enabled us to control the dispersion of each spectral component using an acousto–optic programmable dispersive filter inserted in each arm of the interferometer. As a result, we successfully generated 0.73–optical–cycle pulses at 1.8 μm with a pulse energy of 32 μJ.

短周期短波红外（SWIR）脉冲是用于研究强场物理和非线性光学的有用工具。在这里，我们通过使用级联的基于BBO的光参量放大器（OPA）链演示了SWIR区域中子周期脉冲的放大。借助708 nm泵浦脉冲的定制波长，我们成功地为BBO晶体获得了超过一个八度的增益带宽。在末级放大器前面的Mach-Zehnder型干涉仪中对脉冲的频谱分量进行划分和合成，使我们能够使用插入到每个臂中的声光可编程色散滤波器来控制每个频谱分量的色散。干涉仪。结果，我们成功地产生了1.8微米的0.73光学周期脉冲m的脉冲能量为32μJ。