In this work,we propose and verify experimentally a model that describes the concomitant influence of the beam size and optical roughness on the temporal contrast of optical pulses passing through a pulse stretcher in...In this work,we propose and verify experimentally a model that describes the concomitant influence of the beam size and optical roughness on the temporal contrast of optical pulses passing through a pulse stretcher in chirped-pulse amplification laser systems.We develop an analytical model that is capable of predicting the rising edge caused by the reflection from an optical element in a pulse stretcher,based on the power spectral density of the surface and the spatial beam profile on the surface.In an experimental campaign,we characterize the temporal contrast of a laser pulse that passed through either a folded or an unfolded stretcher design and compare these results with the analytical model.By varying the beam size for both setups,we verify that optical elements in the near-and the far-field act opposed to each with respect to the temporal contrast and that the rising edge caused by a surface benefits from a larger spatial beam size on that surface.展开更多
The advent of chirped-pulse amplification （CPA） has greatly advanced the field of ultrafast and ultra-intense laser technology. CPA has become an indispensable platform for multidisciplinary research, such as physic...The advent of chirped-pulse amplification （CPA） has greatly advanced the field of ultrafast and ultra-intense laser technology. CPA has become an indispensable platform for multidisciplinary research, such as physics, chemistry, life sciences, and precision metrology. The femtosecond laser facility at the Synergic Extreme Condition User Facility （SECUF） is a comprehensive experimental platform with an advanced femtosecond laser source for ultrafast scientific research. It will provide an ultrafast scientific research system having a few-cycle pulse duration, wide spectral range, high energy, and high repetition rate for multipurpose applications.展开更多
We have developed a compact Ti:sapphire laser system which can generate 5.4-Tw pulses at 10-Hz repetition rate. Chirped-pulses are amplified to 450 mj by a regenerative amplifier, a 4-pass amplifier and a 3-pass ampli...We have developed a compact Ti:sapphire laser system which can generate 5.4-Tw pulses at 10-Hz repetition rate. Chirped-pulses are amplified to 450 mj by a regenerative amplifier, a 4-pass amplifier and a 3-pass amplifier. After compression, 250-mJ, 46-fs pulses are obtained.展开更多
基金funding from the Euratom Research and Training Programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053 (S.R. and V.B.)。
文摘In this work,we propose and verify experimentally a model that describes the concomitant influence of the beam size and optical roughness on the temporal contrast of optical pulses passing through a pulse stretcher in chirped-pulse amplification laser systems.We develop an analytical model that is capable of predicting the rising edge caused by the reflection from an optical element in a pulse stretcher,based on the power spectral density of the surface and the spatial beam profile on the surface.In an experimental campaign,we characterize the temporal contrast of a laser pulse that passed through either a folded or an unfolded stretcher design and compare these results with the analytical model.By varying the beam size for both setups,we verify that optical elements in the near-and the far-field act opposed to each with respect to the temporal contrast and that the rising edge caused by a surface benefits from a larger spatial beam size on that surface.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61575217 and 11774410)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB16030200)
文摘The advent of chirped-pulse amplification （CPA） has greatly advanced the field of ultrafast and ultra-intense laser technology. CPA has become an indispensable platform for multidisciplinary research, such as physics, chemistry, life sciences, and precision metrology. The femtosecond laser facility at the Synergic Extreme Condition User Facility （SECUF） is a comprehensive experimental platform with an advanced femtosecond laser source for ultrafast scientific research. It will provide an ultrafast scientific research system having a few-cycle pulse duration, wide spectral range, high energy, and high repetition rate for multipurpose applications.
文摘We have developed a compact Ti:sapphire laser system which can generate 5.4-Tw pulses at 10-Hz repetition rate. Chirped-pulses are amplified to 450 mj by a regenerative amplifier, a 4-pass amplifier and a 3-pass amplifier. After compression, 250-mJ, 46-fs pulses are obtained.
