Open AccessTowards subpicosecond pulses from solid target plasma based seeded soft X-ray laser
Author(s) -
Alok Kumar Pandey,
Irène Papagiannouli,
F. Sanson,
Elsa Baynard,
J. Demailly,
S. Kazamias,
M. Pittman,
O. Neveu,
Bruno Lucas,
A. Le Marec,
A. Klisnick,
A. Calisti,
O. Larroche,
D. Ros,
Olivier Guilbaud
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.399339
Subject(s) - lasing threshold , coherence (philosophical gambling strategy) , optics , pulse duration , physics , amplified spontaneous emission , laser , pulse (music) , plasma , seeding , coherence time , materials science , atomic physics , quantum mechanics , detector , thermodynamics
We investigate the coherence of plasma-based soft X-ray laser (XRL) for different conditions that can alter the electron density in the gain region. We first measure the source temporal coherence in amplified spontaneous emission (ASE) mode. We develop a data analysis procedure to extract both its spectral width and pulse duration. These findings are in agreement with the spectral line shape simulations and seeded operation experimental results. Utilizing the deduced spectral width and pulse duration in a one-dimensional Bloch-Maxwell code, we reproduce the experimental temporal coherence properties of the seeded-XRL. Finally, we demonstrate efficient lasing in ASE and seeded mode at an electron density two times higher than the routine conditions. In this regime, using Bloch-Maxwell modeling, we predict the pulse duration of the seeded XRL to be ∼500fs.