Attosecond control of electronic processes by intense light fields
- A. Baltuska, T. Udem, F. Krausz
- PhysicsNature
- 6 February 2003
The generation of intense, few-cycle laser pulses with a stable carrier envelope phase that permit the triggering and steering of microscopic motion with an ultimate precision limited only by quantum mechanical uncertainty are reported.
Optical frequency metrology
- T. Udem, R. Holzwarth, T. Hänsch
- PhysicsNature
- 14 March 2002
The ability to count optical oscillations of more than 1015 cycles per second facilitates high-precision optical spectroscopy, and has led to the construction of an all-optical atomic clock that is expected eventually to outperform today's state-of-the-art caesium clocks.
A frequency comb in the extreme ultraviolet
This work demonstrates intra-cavity high harmonic generation in the extreme ultraviolet, which promises to lead to another joint frontier of precision spectroscopy and ultrafast science.
Phase-controlled amplification of few-cycle laser pulses
- A. Baltuska, M. Uiberacker, T. Hansch
- PhysicsEuropean Quantum Electronics Conference. EQEC…
- 22 June 2003
Several methods of carrier-envelope-phase stabilization of amplified ultrashort laser pulses are presented. Full temporal characterization of the resultant intense few-cycle light waveforms,…
Absolute Optical Frequency Measurement of the Cesium D 1 Line with a Mode-Locked Laser
- T. Udem, J. Reichert, R. Holzwarth, T. Hänsch
- Physics, Materials Science
- 3 May 1999
We have measured the absolute optical frequency of the cesium ${D}_{1}$ line at 335 THz (895 nm). This frequency provides an important link for a new determination of the fine structure constant…
The Rydberg constant and proton size from atomic hydrogen
- A. Beyer, L. Maisenbacher, T. Udem
- PhysicsScience
- 6 October 2017
The authors obtained the size of the proton using very accurate spectroscopic measurements of regular hydrogen using an asymmetric fit function, which eliminates line shifts from quantum interference of neighboring atomic resonances.
High‐precision wavelength calibration of astronomical spectrographs with laser frequency combs
ABSTRACT We describe a possible new technique for precise wavelength calibration of high-resolutionastronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by sta-ble…
High‐precision calibration of spectrographs
We present the first stringent tests of a novel calibration system based on a laser frequency comb (LFC) for radial velocity measurements. The tests were obtained with the high-resolution, optical…
A frequency comb calibrated solar atlas
- P. Molaro, M. Esposito, T. Wilken
- Physics
- 18 October 2013
Context. The solar spectrum is a primary reference for the study of physical processes in stars and their variation during activity cycles. High resolution spectra of the Sun are easily obtained from…
A 920-Kilometer Optical Fiber Link for Frequency Metrology at the 19th Decimal Place
- K. Predehl, G. Grosche, H. Schnatz
- PhysicsScience
- 27 April 2012
Synchronize Watches Time standards based on the energy-level transitions of atoms and ions provide the most accurate and precise methods of time keeping. Measurements made in one laboratory and in…
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