Dr. Christian Spielmann
Physics, Friedrich Schiller University Jena, Jena, Thuringia, Germany
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Academic Career Length
36Years (1991-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 November 2001 in Nature
Journal Article
MHM. Hentschel
M. Hentschel
RKR. Kienberger
R. KienbergerChristian SpielmannGRG. A. Reider
G. A. ReiderNMN. Milosevic
N. Milosevic
FKF. Krausz
F. Krausz
+4
15 April 1997 in Optics Letters
Journal Article
Mauro NisoliSSS. De Silvestri
S. De Silvestri
OSO. Svelto
O. Svelto
RSR. Szipöcs
R. Szipöcs
KFK. Ferencz
K. Ferencz
FKF. Krausz
F. Krausz
+2
High-energy 20-fs pulses generated by a Ti:sapphire laser system were spectrally broadened to more than 250 nm by self-phase modulation in a hollow fiber filled with noble gases and subsequently compressed in a broadband high-throughput dispersive system. Pulses as short as 4.5 fs with energy up to 20- were obtained with krypton, while pulses as short as 5 fs with energy up to were obtained with argon. These pulses are, to our knowledge, the shortest generated to date at multigigawatt peak powers.
4 May 1998 in Physical Review Letters
Journal Article
MLM. Lenzner
M. Lenzner
JKJ. Krüger
J. Krüger
SSS. Sartania
S. Sartania
ZCZ. Cheng
Z. Cheng
Christian SpielmannFKF. Krausz
F. Krausz
+2
We report measurements of the optical breakdown threshold and ablation depth in dielectrics with different band gaps for laser pulse durations ranging from 5 ps to 5 fs at a carrier wavelength of 780 nm. For , the dominant channel for free electron generation is found to be either impact or multiphoton ionization (MPI) depending on the size of the band gap. The observed MPI rates are substantially lower than those predicted by the Keldysh theory. We demonstrate that sub-10-fs laser pulses open up the way to reversible nonperturbative nonlinear optics (at intensities greater than slightly below damage threshold) and to nanometer-precision laser ablation (slightly above threshold) in dielectric materials.
9 March 2001 in Science
Journal Article
MDMarkus Drescher
Markus Drescher
MHMichael Hentschel
Michael Hentschel
RKReinhard Kienberger
Reinhard KienbergerGTGabriel Tempea
Gabriel Tempea
Christian SpielmannFKFerenc Krausz
Ferenc Krausz
+2
Single soft-x-ray pulses of ∼90–electron volt (eV) photon energy are produced by high-order harmonic generation with 7-femtosecond (fs), 770-nanometer (1.6 eV) laser pulses and are characterized by photoionizing krypton in the presence of the driver laser pulse. By detecting photoelectrons ejected perpendicularly to the laser polarization, broadening of the photoelectron spectrum due to absorption and emission of laser photons is suppressed, permitting the observation of a laser-induced downshift of the energy spectrum with sub-laser-cycle resolution in a cross correlation measurement. We measure isolated x-ray pulses of 1.8 (+0.7/−1.2) fs in duration, which are shorter than the oscillation cycle of the driving laser light (2.6 fs). Our techniques for generation and measurement offer sub-femtosecond resolution over a wide range of x-ray wavelengths, paving the way to experimental attosecond science. Tracing atomic processes evolving faster than the exciting light field is within reach.
24 October 1997 in Science
Journal Article
Christian SpielmannNBN. H. Burnett
N. H. Burnett
SSS. Sartania
S. Sartania
RKR. Koppitsch
R. Koppitsch
MSM. Schnürer
M. Schnürer
FKF. Krausz
F. Krausz
+3
Coherent extreme-ultraviolet radiation extending to wavelengths below the carbon K edge at 4.37 nanometers (nm) has been generated at a repetition rate of 1 kilohertz by focusing 5-femtosecond near-infrared (780 nm) laser pulses into a helium gas jet. The incident light field performs just a few oscillations, which results in the emission of an x-ray supercontinuum rather than discrete harmonics. Owing to the extremely short rise time of the driving pulses, neutral atoms can be exposed to high fields before they are depleted by ionization. As a result, the observed x-ray radiation extends well into the water window and is delivered in a well-collimated beam (divergence less than 1 milliradian). The high repetition rate and spatial coherence result in a brightness of about 5 × 10 8 photons per square millimeter per square milliradian per second in a 1-percent bandwidth at 4.37 nm, the carbon edge of the water window. The compact laboratory system holds promise as a source for biological holography and nonlinear optics in the x-ray regime.
15 April 2000 in Optics Letters
Journal Article
FVF. Verluise
F. Verluise
Vincent LaudeZCZ. Cheng
Z. Cheng
Christian SpielmannPTP. Tournois
P. Tournois
We demonstrate experimentally that an arbitrary phase and amplitude profile can be applied to an ultrashort pulse by use of an acousto-optic programmable dispersive filter (AOPDF). Our filter has a large group-delay range that extends over 3 ps and a 30% diffraction efficiency over 150 THz. Experiments were conducted on a kilohertz chirped-pulse amplification laser chain capable of generating 30-fs pulses without additional pulse shaping. Compensating for gain narrowing and residual phase errors with an AOPDF in place of the stretcher results in 17-fs transform-limited pulses. Arbitrary shaping of these 17-fs pulses is also demonstrated in both the temporal and the spectral domains.
About Me
Prof. Dr. Christian Spielmann is a distinguished physicist specializing in quantum electronics and ultrafast optics. He holds a diploma and a doctorate in Electrical Engineering from the Vienna University of Technology, where he also completed his habilitation. Currently, he serves as a Full Professor and Chair of Quantum Electronics Abbe Center of Photnics, at Friedrich Schiller University Jena, Germany and is also with Helmholtz Institute Jena, Germany.
His academic journey includes professorships at the University of Würzburg and Vienna University of Technology. Prof. Spielmann has co-authored over 200 publications in top-tier journals, with pioneering contributions to femtosecond lasers and attosecond pulse generation—research that contributed to the 2023 Nobel Prize in Physics.
A co-founder of Femtolasers GmbH, he has bridged academic research with industrial applications. He is a member of several scientific boards and societies and has received numerous honors, including the Thuringian Research Award (2010), the Kohlrausch Prize (1997), and an APART Fellowship from the Austrian Academy of Sciences. His current research focuses on high harmonic generation, ultrashort laser-matter interactions, and advanced soft x-ray imaging techniques.