Rapid and precise read-out of terahertz sensor by high-speed asynchronous optical sampling (2009)
Klatt, Gregor, Nagel, Michael, Dekorsy, Thomas, Bartels, Albrecht
High-speed asynchronous optical sampling is used for the rapid and precise determination of transmission resonances of terahertz surface sensors based on asymmetric double split ring resonator...
Gebs, Raphael, Dekorsy, Thomas, Diddams, Scott A., Bartels, Albrecht
We report an optical parametric oscillator (OPO) based on periodically poled lithium niobate (PPLN) that is synchronously pumped by a femtosecond Ti:sapphire laser at 1 GHz repetition rate. The...
Hudert, Florian, Bartels, Albrecht, Dekorsy, Thomas, Köhler, Klaus
The doping profile in different n-doped GaAs homoepitaxial structures grown by molecular beam epitaxy is investigated in the time domain by employing a laser based picosecond ultrasound technique in...
Passively mode-locked 10 GHz femtosecond Ti:sapphire laser (2008)
Bartels, Albrecht, Heinecke, Dirk, Diddams, Scott A.
We report a mode-locked Ti:sapphire femtosecond laser emitting 42 fs pulses at a 10 GHz repetition rate. When operated with a spectrally integrated average power greater than 1 W, the associated...
Passively mode-locked 10 GHz femtosecond Ti:sapphire laser (2008)
Bartels, Albrecht, Heinecke, Dirk, Diddams, Scott A.
We report a mode-locked Ti:sapphire femtosecond laser emitting 42 fs pulses at a 10 GHz repetition rate. When operated with a spectrally integrated average power greater than 1 W, the associated...
Laserblitze im Rekordtakt (2008)
Bartels, Albrecht, Heinecke, Dirk
In Konstanz wurde der weltweit schnellste Ultrakurzpulslaser gebaut. Er eröffnet der Präzision von Frequenzmessungen neue Dimensionen. Dadurch erhöht er auch die Chancen zum Aufspüren ferner...
Spectrally resolved optical frequency comb from a self-referenced 5 GHz femtosecond laser (2007)
Bartels, Albrecht, Gebs, Raphael, Kirchner, Matt, Diddams, Scott A.
We report a mode-locked Ti:sapphire femtosecond laser with 5GHz repetition rate. Spectral broadening of the 24 fs pulses in a microstructured fiber yields an octave-spanning spectrum and permits...
Hydration dynamics of oriented DNA films investigated by time-domain terahertz spectroscopy (2007)
Kistner, Caroline, André, Alexander, Fischer, Theo, Thoma, Arne, Janke, Christof, Bartels, Albrecht, ...
The B to A conformational transition of highly oriented DNA films due to a hydration change is observed with time-domain terahertz spectroscopy. Wet-spun films of calf thymus and salmon DNA are...
Taubert, Richard, Hudert, Florian, Bartels, Albrecht, Merkt, Florian, Habenicht, Anja, Leiderer, Paul, ...
We investigate the impulsively excited acoustic dynamics of nanoscale Au triangles of different sizes and thicknesses on silicon and glass substrates. We employ high-speed asynchronous optical...
Ultrafast time-domain spectroscopy based on high-speed asynchronous optical sampling (2007)
Bartels, Albrecht, Cerna, Roland, Kistner, Caroline, Thoma, Arne, Hudert, Florian, Janke, Christof, ...
High-speed asynchronous optical sampling (ASOPS) is a novel technique for ultrafast time-domain spectroscopy (TDS). It employs two mode-locked femtosecond oscillators operating at a fixed repetition...
A surface phase transition of supported gold nanoparticles (2007)
Plech, Anton, Cerna, Roland, Kotaidis, Vassilios, Hudert, Florian, Bartels, Albrecht, Dekorsy, Thomas
A thermal phase transition has been resolved in gold nanoparticles supported on a surface. By use of asynchronous optical sampling with coupled femtosecond oscillators, the Lamb vibrational modes...
Spectrally resolved optical frequency comb from a self-referenced 5 GHz femtosecond laser (2007)
Bartels, Albrecht, Gebs, Raphael, Kirchner, Matthew S., Diddams, Scott A.
We report a mode-locked Ti:sapphire femtosecond laser with 5 GHz repetition rate. Spectral broadening of the 24 fs pulses in a microstructured fiber yields an octave-spanning spectrum and permits...
Terahertz-Spektroskopie mit High-Speed ASOPS (2007)
Bartels, Albrecht, Dekorsy, Thomas
Asynchrones Optisches Abtasten (engl. asynchronous optical sampling, ASOPS) ist eine Technik für ultraschnelle zeitaufgelöste Spektroskopie, die im Gegensatz zu konventionellen Methoden ohne...
Wilpers, Guido, Oates, Chris, Diddams, Scott A., Bartels, Albrecht, Fortier, Tara, Oskay, Windell, ...
We report an absolute frequency measurement of the optical clock transition at 657 nm in 40Ca with a relative uncertainty of 7.5 x 10-15
High-speed asynchronous optical sampling for high-sensitivity detection of coherent phonons (2007)
Dekorsy, Thomas, Taubert, Richard, Hudert, Florian, Schrenk, Gerhard, Bartels, Albrecht, Cerna, Roland, ...
A new optical pump-probe technique is implemented for the investigation of coherent acoustic phonon dynamics in the GHz to THz frequency range which is based on two asynchronously linked femtosecond...
Ehlers, Alexander, Riemann, Iris, Martin, Sven, Le Harzic, Ronan, Bartels, Albrecht, Janke, Christof, ...
Multiphoton tomography of human skin and nanosurgery of human chromosomes have been performed with a I GHz repetition rate laser by the use of the commercially available femtosecond multiphoton laser...
Frequency Uncertainty for Optically Referenced Femtosecond Laser Frequency Combs (2007)
Ma, Long-Sheng, Bi, Zhiyi, Bartels, Albrecht, Kim, Kyoungsik, Robertsson, Lennart, Zucco, Massimo, ...
We present measurements and analysis of the currently known relative frequency uncertainty of femtosecond laser frequency combs (FLFCs) based onKerr-lens mode-locked Ti:sapphire lasers. Broadband...
Coherent acoustic phonons in nanostructures investigated by asynchronous optical sampling (2006)
Dekorsy, Thomas, Hudert, Florian, Cerna, Roland, Schaefer, Hanjo, Janke, Christof, Bartels, Albrecht, ...
A new optical pump-probe technique is implemented for the investigation of acoustic phonon dynamics in the GHz to THz frequency range which is based on two asynchronously linked femtosecond lasers....
Bartels, Albrecht, Hudert, Florian, Janke, Christof, Dekorsy, Thomas, Köhler, Klaus
We demonstrate a technique for femtosecond time-resolved optical pump-probe spectroscopy that allows to scan over a nanosecond time delay at a kilohertz scan rate without mechanical delay line. Two...
High-resolution THz spectrometer with kHz scan rates (2006)
Bartels, Albrecht, Thoma, Arne, Janke, Christof, Dekorsy, Thomas, Dreyhaupt, Andre, Winnerl, Stephan, ...
We demonstrate a rapid scanning high-resolution THz spectrometer capable of acquiring THz field transients with 1 ns duration without mechanical delay line. The THz spectrometer is based on two 1-GHz...
Fortier, Tara M., Bartels, Albrecht, Diddams, Scott A.
We demonstrate a self-referenced, octave-spanning, mode-locked Ti:sapphire laser with a scalable repetition rate (550 MHz-1.35 GHz). We use the frequency comb output of the laser, without additional...
Phase-stabilized ultrafast lasers signal new era in measurement and research (2006)
Fortier, Tara M., Bartels, Albrecht, Diddams, Scott A.
The 2005 Nobel Prize in Physics highlights the combination of optical frequency combs and precision spectroscopy for tests of basic physics.
Low-noise synthesis of microwave signals from an optical source (2005)
McFerran, John, Ivanov, Eugene, Bartels, Albrecht, Wilpers, Guido, Oates, Chris, Diddams, Scott, ...
The low-noise synthesis of a harmonic comb of microwave frequencies using a 1 GHz femtosecond-laser-based synthesiser that is referenced to a cavity-stab ilised laser is demonstrated. The residual...
Bartels, Albrecht, Diddams, Scott A., Oates, Chris W., Wilpers, Guido, Bergquist, James C., Oskay, Windell H., ...
We use femtosecond laser frequency combs to convert optical frequency references to the microwave domain, where we demonstrate the synthesis of lO-GHz signals having a fractional frequency...
High-resolution spectroscopy with a femtosecond laser frequency comb (2005)
Gerginov, Vladislav, Tanner, Carol E., Diddams, Scott A., Bartels, Albrecht, Hollberg, Leo
The output of a mode-locked femtosecond laser is used for precision single-photon spectroscopy of 133Cs in an atomic beam. By changing the laser's repetition rate, the cesium D 1 (6s...
Janke, Christof, Först, Michael, Nagel, Michael, Kurz, Heinrich, Bartels, Albrecht
Two femtosecond Ti:sapphire lasers with slightly different repetition rates near 1 GHz are coupled to implement high-speed asynchronous optical sampling. The application of this technique is...
Mizoguchi, Kohji, Hino, T., Nakayama, Masaaki, Dekorsy, Thomas, Bartels, Albrecht, Kurz, Heinrich, ...
Coherent folded longitudinal acoustic phonons in a GaAs/AlAs long-period superlattice (SL) have been investigated by using a reflection-type two-color pumpprobe technique under the condition that...
Bartels, Albrecht, Newbury, Nathan R., Thomann, Isabell, Hollberg, Leo, Diddams, Scott A.
We link the output spectra of a Ti.sapphire and a Cr .forst erite femtosecond laser phase coher ently to form a continuous frequ ency comb with a wavelength coverage of O.57-1.45 μm a t power...
Optical Frequency Synthesis and Comparison with Uncertainty at the 10 -19 Level (2004)
Ma, Long-Sheng, Bi, Zhiyi, Bartels, Albrecht, Robertsson, Lennart, Zucco, Massimo, Windeler, Robert S., ...
A femtosecond Laser-based opticaL frequency synthesizer is referenced to an optical standard, and we use it to demonstrate the generation and controL of the frequency of eLectromagnetic fieLds over...
Stabilization of femtosecond laser frequency combs with subhertz residual linewidths (2004)
Bartels, Albrecht, Oates, Chris W., Hollberg, Leo, Diddams, Scott A.
We demonstrate that femtosecond laser frequency combs (FLFCs) can have a subhertz linewidth across their entire emission spectra when they are phase locked to a reference laser with a similarly...
Corwin, Kristan L., Thomann, Isabell, Dennis, Tasshi, Fox, Richard W., Swann, William, Curtis, Anne, ...
A frequency comb is generated with a chromium-doped forsterite femtosecond laser, spectrally broadened in a dispersion-shifted highly nonlinear fiber, and stabilized. The resultant evenly spaced comb...
Gerginov, Vladislav, Tanner, Carol E., Diddams, Scott A., Bartels, Albrecht, Hollberg, Leo
Optical frequencies of the hyperfine components of the D2 line in 133Cs are determined using high-resolution spectroscopy and a ferntosecond laser frequency comb. A narrow-linewidth probe laser...
Bartels, Albrecht, Diddams, Scott A., Ramond, T. M., Hollberg, Leo
We independently phase lock the repetition rates of two femtosecond lasers at their =456,OOOth harmonic to a common optical oscillator. The timing jitter of each individual laser relative to the...
420-MHz Cr:forsterite femtosecond ring laser and continuum generation in the 1-2-my m range (2003)
Thomann, Isabell, Bartels, Albrecht, Corwin, Kristan L., Newbury, Nathan R., Hollberg, Leo, Diddams, Scott A., ...
We demonstrate a chromium-doped forsterite femtosecond ring laser that generates 30-fs pulses at a 420-MHz repetition rate with nearly 500 mW of average power. The compact solid-state design and...
Diddams, Scott A., Bartels, Albrecht, Ramond, Tanya M., Oates, Chris W., Bize, Sebastien, Curtis, E. Anne, ...
This paper describes recent advances in the design and control of femtosecond laser combs for their use in optical clocks and in the synthesis of low-noise microwave and optical signals. The authors...
Inversionless amplification of coherent terahertz radiation (2003)
Janke, Christof, Haring Bolivar, Peter, Bartels, Albrecht, Kurz, Heinrich, Künzel, Harald
We experimentally demonstrate inversionless amplification of the emission from electronic transitions in a solid state system inside a cavity. A semiconductor-based terahertz (THz) emitter is exposed...
Bartels, Albrecht, Kurz, Heinrich
A five-element Ti:sapphire femtosecond ring oscillator emitting a broadband continuum that ranges from 560 to 1150 nm at -50 dB below the maximum with a repetition rate of 1 GHz is demonstrated. The...
Ramond, T. M., Diddams, Scott A., Hollberg, Leo, Bartels, Albrecht
An optical clockwork is created with a compact 1-GHz repetition-rate laser and three nonlinear crystals. The broadband continuum output of the laser covers sufficient bandwidth to provide direct...
1-GHz-repetition-rate femtosecond optical parametric oscillator (2002)
Zhang, X. P., Hebling, János, Bartels, Albrecht, Nau, Dietmar, Kuhl, Jürgen, Rühle, Wolfgang, ...
We report a 1 GHz-repetition-rate, low-pump-threshold, all-solid-state femtosecond optical parametric oscillator (OPO) based on periodically poled LiNbO3 and pumped by a GHz repetition rate...
Zugl.: Aachen, Techn. Hochsch., Diss., 2000.
Hawker, Philip, Kent, Anthony J., Challis, Lawrence J., Bartels, Albrecht, Dekorsy, Thomas, Kurz, Heinrich, ...
We have used pulse time-of-flight techniques to examine the phonon emission from an optically excited GaAs/AlAs superlattice structure. For laser excitation wavelengths shorter than 767 nm (the...
Impulsive Excitation of Phonon-Pair Combination States by Second-Order Raman Scattering (2000)
Bartels, Albrecht, Dekorsy, Thomas, Kurz, Heinrich
The excitation of (100)-oriented KTaO3 with 25-fs laser pulses impulsively drives phonon-pair combination states via second-order Raman scattering. Oscillations in the phonon-amplitude covariance at...
Coupled Bloch-Phonon Oscillations in Semiconductor Superlattices (2000)
Dekorsy, Thomas, Bartels, Albrecht, Kurz, Heinrich, Köhler, Klaus, Hey, Rudolf, Ploog, Klaus
We investigate coherent Bloch oscillations in GaAs/AlxGa1-xAs superlattices with electronic miniband widths larger than the optical phonon energy. In these superlattices the Bloch frequency can be...
Bartels, Albrecht, Dekorsy, Thomas, Kurz, Heinrich
A Kerr-lens mode-locked femtosecond Ti:sapphire laser operating at a repetition rate of 2 GHz is demonstrated. A mirror-dispersion-controlled unidirectional ring cavity delivers nearly...
Bartels, Albrecht, Dekorsy, Thomas, Kurz, Heinrich, Köhler, Klaus
Coherent zone-folded acoustic phonons are excited in GaAs/AlAs superlattices by femtosecond laser pulses via resonant impulsive stimulated Raman scattering in both forward and backward scattering...
Coherent control of acoustic phonons in semiconductor superlattices (1998)
Bartels, Albrecht, Dekorsy, Thomas, Kurz, Heinrich, Köhler, Klaus
Coherent acoustic phonons are generated in GaAs/AlAs superlattices by excitation with femtosecond laser pulses. Several modes of the acoustic phonon spectrum are observed, in agreement with the...