Observation of spectral gain narrowing in a high-order harmonic seeded soft-x-ray amplifier
F. Tissandier
(1)
,
Stéphane Sebban
(1)
,
Maxime Ribière
(1)
,
Julien Gautier
(1)
,
Philippe Zeitoun
(1)
,
Guillaume Lambert
(1)
,
Sardinha Anna Barszczak
(1)
,
Jean-Philippe Goddet
(1)
,
Frédéric Burgy
(1)
,
T. Lefrou
(1)
,
C. Valentin
(1)
,
Antoine Rousse
(1)
,
O. Guilbaud
(2)
,
Annie Klisnick
(2)
,
J. Nejdl
(3)
,
T. Mocek
(3)
,
G. Maynard
(4)
F. Tissandier
- Fonction : Auteur
- PersonId : 4398
- IdHAL : ftissandier
- IdRef : 16036647X
Stéphane Sebban
- Fonction : Auteur
- PersonId : 4406
- IdHAL : stephane-sebban
- IdRef : 095683410
Philippe Zeitoun
- Fonction : Auteur
- PersonId : 4358
- IdHAL : philippe-zeitoun
- IdRef : 08195574X
Guillaume Lambert
- Fonction : Auteur
- PersonId : 4339
- IdHAL : guillaume-lambert
- IdRef : 129226882
Jean-Philippe Goddet
- Fonction : Auteur
- PersonId : 4337
- IdHAL : jean-philippe-goddet
- IdRef : 147945127
C. Valentin
- Fonction : Auteur
- PersonId : 749586
- IdHAL : constance-valentin
- ORCID : 0000-0001-7519-3829
- IdRef : 197903657
Antoine Rousse
- Fonction : Auteur
- PersonId : 4344
- IdHAL : antoine-rousse
- ORCID : 0000-0003-0885-9285
- IdRef : 076337170
Résumé
We report an observation of spectral gain narrowing of a high-order harmonic amplified by a soft-x-ray optical-field-ionized plasma. The temporal coherence and spectral linewidth of both the seeded and unseeded soft-x-ray lasers were experimentally measured using a varying-path-difference interferometer. The results showed that the high-order harmonic is subject to a strong spectral narrowing during its propagation in the plasma amplifier without rebroadening at saturation. This is in good agreement with a radiative transfer calculation including gain narrowing and saturation rebroadening.