Extremely Nonlinear Optics Using Shaped Pulses Spectrally Broadened in an Argon- or Sulfur Hexafluoride-Filled Hollow-Core Fiber

Abstract

Abstract:In this contribution we present a comparison of the performance of spectrally broadened ultrashort pulses using a hollow-core fiber either filled with argon or sulfur hexafluoride (SF6) for demanding pulse-shaping experiments. The benefits of both gases for pulse-shaping are studied in the highly nonlinear process of high-harmonic generation. In this setup, temporally shaping the driving laser pulse leads to spectrally shaping of the output extreme ultraviolet (XUV) spectrum, where total yield and spectral selectivity in the XUV are the targets of the optimization approach. The effect of using sulfur hexafluoride for pulse-shaping the XUV yield can be doubled compared to pulse compression and pulse-shaping using argon and the spectral range for selective optimization of a single harmonic can be extended. The obtained results are of interest for extending the range of ultrafast science applications drawing on tailored XUV fields.

Online Monitoring of Laser-Generated XUV Radiation Spectra by Surface Reflectivity Measurements with Particle Detectors

“…The shaped pulses are focused into an argon-filled capillary for HHG. Further details about the pulse-shaping device and the HHG setup can be found in [23]. The generated XUV radiation is separated from the laser beam by an aluminum filter foil (thickness of 300 nm), focused by a toroidal gold mirror into the interaction region, and characterized by an XUV spectrometer (LHT 30, HORIBA Jobin Yvon, Bensheim, Germany) equipped with a PI-SX 400 back-illuminated XUV-CCD, Roper Scientific, Martinsried, Germany).…”

“…Further details about the pulse-shaping device, computer-controlled optimizations, and the HHG in capillaries can be found in [23,26,28] (and references therein). For our experiments, we After spectral broadening laser pulses are sent through a prism compressor with a computer-controlled deformable mirror for pulse-shaping.…”

Automated Data Acquisition System Using a Neural Network for Prediction Response in a Mode-Locked Fiber Laser

“…The combining ANN and the dispersive Fourier transform are mentioned in [25] where the authors can predict the pulse duration in a F8L reached until 95% success. Besides, the evolutionary algorithm (EA) is mentioned in [26], where the authors employing this application for control over the high-harmonic spectrum and to shape the laser pulse. Recently in [27], a deep neural network (DNNs) for control and the optimization of the multiple parameters of a deep ultraviolet mode-locked laser is used.…”