High-power ultrashort pulse lasers have achieved great success in scientific and industrial applications and play an important role in disciplines such as biology, chemistry, physics, materials science, and medicine. They are also used in frequency conversion, lithography, and metrology in the semiconductor industry. To increase the power and energy of laser systems, researchers are focusing on ultrafast thin-film oscillators that enable high average powers and femtosecond operation.

An important approach to achieving ultrafast laser pulses is nonlinear pulse compression, particularly with the aid of multipass cells (MPC). This technique offers a solution for combining the advantages of ytterbium-doped gain media with ultrashort pulse durations. MPC offers several advantages, such as high optical transmission, high energy scalability, and high average power, without compromising beam quality and cost efficiency. By combining ultrafast thin-film oscillators and nonlinear compression techniques such as MPC, researchers can achieve new breakthroughs in the development of high-power ultrashort pulse lasers and further expand their applications in various fields.