Abstract
In the current study, we present a novel intuitive graphical method for the simulation of nonlinear effects on stretched pulses, characterized by a large time-bandwidth product. By way of example, this method allows precise determination of effects occurring in CPA (chirped pulse amplification) laser chains, such as the pre-pulse generation by the nonlinear Kerr effect. This method is not limited to first-order dispersion and can handle all resulting distortions of the generated pre-pulse.
Highlights
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Ultra-intense laser systems are used for a variety of applications in the fields of highenergy-density physics and relativistic laser plasma physics [1]
Despite its capacity to lower nonlinearities in the amplifiers, the CPA technique, when used for an extremely highpower system (PW range), still accumulates nonlinear distortions due to the Kerr effect, which is characterized by the maximum value of the B-integral
Summary
Frequency Representation Used for CPA Laser Simulation. Appl. In the classical finite-difference time-domain and split-step Fourier methods, large time-bandwidth product laser pulses, such as the ones used in CPA, are difficult to handle. These methods solve the pulse propagation problem, they are time- and memoryconsuming in computation, as the temporal resolution has to be in the order of the Fourier transform-limited pulse width, while the excursion should remain larger than the pulse width. We propose an alternative method that keeps the advantages of both domains without needing any direct relationship between the spectral and temporal resolution and excursion It has the advantage of being intuitive as a graphical representation of stretched laser pulses with huge time-bandwidth products
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