The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ferenc Krausz - One of the best experts on this subject based on the ideXlab platform.
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sub 10 fs terawatt scale ti Sapphire Laser system
Optics Letters, 2003Co-Authors: Joszef Seres, Alexander Muller, Eniko Seres, Kevin Okeeffe, Miklos Lenner, R Herzog, Daniel Kaplan, Christian Spielmann, Ferenc KrauszAbstract:A three-stage, 1-kHz amplifier system delivering pulses shorter than 10 fs with a peak power in excess of 0.3 TW is reported. Passive and active spectral intensity and phase control allows the preservation of a bandwidth of 120 nm (FWHM) to as high as multimillijoule energy levels and temporal compression of the broadband pulses close to their Fourier limit. The system is scalable to peak powers well beyond 1 TW and holds promise for substantially advancing the state of the art of coherent laboratory soft-x-ray sources.
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sub 10 fs mirror dispersion controlled ti Sapphire Laser
Optics Letters, 1995Co-Authors: Andreas Stingl, M Lenzne, Ch Spielma, Ferenc Krausz, R SzipocsAbstract:We demonstrate the generation of nearly bandwidth-limited 8-fs optical pulses near 0.8 μm from a self-mode-locked Ti:Sapphire Laser oscillator, using chirped dielectric mirrors for dispersion control. The mode-locking performance is described, and limitations are discussed.
U Stamm - One of the best experts on this subject based on the ideXlab platform.
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improved mode locking of a femtosecond titanium doped Sapphire Laser by intracavity second harmonic generation
Applied Physics Letters, 1992Co-Authors: V Petrov, D Georgiev, U StammAbstract:The inclusion of a frequency doubling crystal in a self mode‐locked titanium‐doped Sapphire Laser stabilizes the mode‐locking regime. 125 fs pulses at ∼800 nm are generated at 90 MHz repetition rate. Femtosecond second harmonic pulse trains of 10 mW average power are obtained for the first time in the spectral region around 400 nm.
W Sibbett - One of the best experts on this subject based on the ideXlab platform.
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femtosecond optical transfection of cells viability and efficiency
Optics Express, 2006Co-Authors: David J Stevenson, W Sibbett, B Agate, Xanthi Tsampoula, Patrick Tobias Fischer, C T A Brown, Andrew Riches, Frank J Gunnmoore, Kishan DholakiaAbstract:Photoporation is a rapidly expanding technique for the introduction of macromolecules into single cells. However, there remains no study into the true efficiency of this procedure. Here, we present a detailed analysis of transfection efficiency and cell viability for femtosecond optical transfection using a titanium Sapphire Laser at 800 nm. Photoporation of 4000 Chinese Hamster ovary cells was performed, representing the largest optical transfection study reported to date. We have investigated a range of Laser fluences at the cell membrane and, at 1.2 microJ/cm(2), have found an average transfection efficiency of 50 +/- 10%. Contrary to recent literature, in which 100% efficiency is claimed, our measure of efficiency accounts for all irradiated cells, including those lost as a result of Laser treatment, thereby providing a true biological measure of the technique.
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regeneratively initiated self mode locked ti Sapphire Laser
Optics Letters, 1991Co-Authors: D E Spence, J M Evans, W E Sleat, W SibbettAbstract:It is demonstrated that the incorporation of an acousto-optic modulator within the cavity of a self-mode-locked Ti:Sapphire Laser can lead to self-starting and stable generation of pulses that have durations of 60 fs when the acousto-optic device is driven regeneratively from the Laser output. Data are also presented that show that the application of cavity-frequency locking techniques dramatically improves the phase noise characteristics of the mode-locked Laser.
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60 fsec pulse generation from a self mode locked ti Sapphire Laser
Optics Letters, 1991Co-Authors: D E Spence, P N Kean, W SibbettAbstract:Pulses having durations as short as 60 fsec have been directly generated by a self-mode-locked, dispersion-compensated Ti:Sapphire Laser. By using an extracavity fiber–prism pulse compressor, pulse durations as short as 45 fsec have been obtained.
Ivan P Christov - One of the best experts on this subject based on the ideXlab platform.
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enhanced high harmonic generation using 25 fs Laser pulses
Physical Review Letters, 1996Co-Authors: Jing Zhou, Margaret M Murnane, Henry C Kapteyn, Justin Peatross, Ivan P ChristovAbstract:We present experimental and theoretical results on high-harmonic generation in noble gases using an 805 nm, 25 fs, titanium-doped Sapphire Laser. The harmonic energies observed are unexpectedly high when compared with experimental and theoretical results to date for longer excitation pulses. We observe that the efficiency of harmonic production is highest for shorter pulses. Furthermore, the wavelength of the harmonics can be tuned by adjusting the sign of the chirp of the excitation pulse, demonstrating a tunable, ultrashort-pulse, $l25\mathrm{fs}$ soft-x-ray source.
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pulse evolution in a broad bandwidth ti Sapphire Laser
Optics Letters, 1994Co-Authors: Jianping Zhou, Greg Taft, Chungpo Huang, Margaret M Murnane, Henry C Kapteyn, Ivan P ChristovAbstract:We demonstrate that by operating near the zero second- and third-order dispersion point in a self-mode-locked Ti:Sapphire Laser we can generate sub-10-fs pulses. Our numerical simulations show that the pulse duration is limited by fourth-order dispersion and that shorter pulses will be possible if this can be reduced. Also, by inserting a pellicle in various positions in a Ti:Sapphire cavity, we have measured the intracavity pulse duration and chirp of the circulating pulse in the Laser. Our results demonstrate that the pulse is shortest near the middle of the Laser crystal, in one direction of propagation. In the other direction of propagation, the pulse is positively chirped and several times longer.
R W Wallace - One of the best experts on this subject based on the ideXlab platform.
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broadly tunable high power operation of an all solid state titanium doped Sapphire Laser system
Optics Letters, 1991Co-Authors: T R Steele, D C Gerstenberger, A Drobshoff, R W WallaceAbstract:Broadly tunable and high-power operation of a titanium-doped Sapphire Laser is obtained with a diode-Laser-pumped frequency-doubled Nd:YAG Laser as the pump source. A maximum broadband (FWHM = 25 nm) output pulse energy of 720 μJ at 795 nm in a TEM00 mode is obtained for 1850 μJ of energy of 532-nm pump light. A minimum pulse duration of 7 ns is obtained from a 40-mm-long cavity. With the use of an intracavity prism, the Ti:Sapphire Laser is tunable continuously over the 696–1000-nm spectral range (with three different mirror sets).
