نتایج جستجو برای: femtosecond laser

تعداد نتایج: 188297  

2015
Matthieu Chollet Roberto Alonso-Mori Marco Cammarata Daniel Damiani Jim Defever James T. Delor Yiping Feng James M. Glownia J. Brian Langton Silke Nelson Kelley Ramsey Aymeric Robert Marcin Sikorski Sanghoon Song Daniel Stefanescu Venkat Srinivasan Diling Zhu Henrik T. Lemke David M. Fritz

The X-ray Pump-Probe instrument achieves femtosecond time-resolution with hard X-ray methods using a free-electron laser source. It covers a photon energy range of 4-24 keV. A femtosecond optical laser system is available across a broad spectrum of wavelengths for generating transient states of matter. The instrument is designed to emphasize versatility and the scientific goals encompass ultraf...

2016
H. Chen H. Li YC. Sun Y. Wang PJ. Lü

To study the effects of laser fluence (laser energy density), scanning line spacing and ablation depth on the efficiency of a femtosecond laser for three-dimensional ablation of enamel and dentin. A diode-pumped, thin-disk femtosecond laser (wavelength 1025 nm, pulse width 400 fs) was used for the ablation of enamel and dentin. The laser spot was guided in a series of overlapping parallel lines...

Journal: :Optics express 2017
Min Wang Yingxin Xu Zhiwei Fang Yang Liao Peng Wang Wei Chu Lingling Qiao Jintian Lin Wei Fang Ya Cheng

We demonstrate electro-optic tuning of an on-chip lithium niobate microresonator with integrated in-plane microelectrodes. First, the metallic microelectrodes were fabricated on the substrate using a femtosecond laser. Then high-Q lithium niobate microresonator located between the microelectrodes was further fabricated by femtosecond laser direct writing accompanied by focused ion beam milling....

Journal: :Optics letters 2012
René Berlich Jiyeon Choi Clarisse Mazuir Winston V Schoenfeld Stefan Nolte Martin Richardson

We present a practical method to determine femtosecond laser induced refractive index changes in transparent materials. Based on an iterative Fourier transform algorithm, this technique spatially resolves the refractive index of complex structures by combining the dimensions of the modified region with the corresponding phase change extracted from far-field intensity measurements. This approach...

Journal: :Optics letters 2008
Salavat R Aglyamov Andrei B Karpiouk Frederic Bourgeois Adela Ben-Yakar Stanislav Y Emelianov

A recently developed ultrasound technique is evaluated by measuring the behavior of a cavitation bubble that is induced in water by a femtosecond laser pulse. The passive acoustic emission during optical breakdown is used to estimate the location of the cavitation bubble's origin. In turn, the position of the bubble wall is defined based on the active ultrasonic pulse-echo signal. The results s...

Journal: :Optics letters 2012
B D Strycker M Springer C Trendafilova X Hua M Zhi A A Kolomenskii H Schroeder J Strohaber H A Schuessler G W Kattawar A V Sokolov

We demonstrate energy exchange between two filament-forming femtosecond laser beams in liquid methanol. Our results are consistent with those of previous works documenting coupling between filaments in air; in addition, we identify an unreported phenomenon in which the direction of energy exchange oscillates at increments in the relative pulse delay equal to an optical period (2.6 fs). Energy t...

2009
E. Lindner M. Becker S. Brückner Y. Wang M. Rothhardt H. Bartelt

The inscription of fiber Bragg gratings with femtosecond laser radiation gives access to a wide range of new materials beyond conventional UV-photosensitive and special hydrogen loaded materials. We have therefore investigated the use of an interferometric technique in combination with UV femtosecond laser pulses to generate fiber Bragg gratings in different types of fibers. Additionally, the t...

Journal: :Physical review letters 2009
C B Madsen L B Madsen S S Viftrup M P Johansson T B Poulsen L Holmegaard V Kumarappan K A Jørgensen H Stapelfeldt

We demonstrate that strong laser pulses can induce torsional motion in a molecule consisting of a pair of phenyl rings. A nanosecond laser pulse spatially aligns the carbon-carbon bond axis, connecting the two phenyl rings, allowing a perpendicularly polarized, intense femtosecond pulse to initiate torsional motion accompanied by an overall rotation about the fixed axis. We monitor the induced ...

2014
Yuechen Jia Chen Cheng Javier R. Vázquez de Aldana Gabriel R. Castillo Blanca del Rosal Rabes Yang Tan Daniel Jaque Feng Chen

Miniature laser sources with on-demand beam features are desirable devices for a broad range of photonic applications. Lasing based on direct-pump of miniaturized waveguiding active structures offers a low-cost but intriguing solution for compact light-emitting devices. In this work, we demonstrate a novel family of three dimensional (3D) photonic microstructures monolithically integrated in a ...

Journal: :Optics letters 2001
J P Geindre P Audebert S Rebibo J C Gauthier

We present a method for obtaining time-resolved measurements of the amplitude modulation and the phase shift of a chirped probe pulse interacting with a femtosecond-laser-produced plasma. Based on spectral interferometry, the technique allows for single-shot measurements and keeps the temporal resolution associated with the full bandwidth of the probe pulse. We demonstrate the efficiency of thi...

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