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Femtosecond laser ablation with Bessel beam profile can yield high quality structures on metal thin films at nanoscale [1]. By adjusting the laser fluence one can control size of ablated structures. Moreover, resolution can go beyond the diffraction limit when the laser energy is adjusted around the ablation threshold [2]. Advantages of using diffraction-free Bessel beams bring us to ablate 125 nm-wide...
Shaping laser beams has been a fascinating topic in optic studies lately, because they exhibit intriguing characteristics and have potential applications. One of the most commonly used profiles is the Bessel beams. These beams, which are first shown by Durnin and others, are called also diffraction-free beams [1]. They have much long length of focus and their profiles do not change in free space propagation...
Femtosecond laser writing in glass is controlled by the polarization plane azimuth and intensity front tilt of light pulse. Polarization dependent distribution of extraordinary modifications along the light propagation direction is observed.
We experimentally demonstrate that high energy femtosecond laser pulses can be compressed using nonlinear propagation in gas-filled planar hollow waveguides. A stability analysis provides guidelines for up-scaling the compressible pulse energy without spatial beam-breakup.
We experimentally demonstrate the revival of short lived femtosecond laser induced plasma channels in air by a nanosecond laser pulse up to several milliseconds after plasma recombination. Such revived plasma channel is generated over 50 cm using a Bessel-like nanosecond laser beam.
Compression of ultrashort laser pulses by self-phase modulation in a gas-filled planar hollow waveguide is studied both experimentally and theoretically. This technique outperforms significantly other techniques based on hollow core fibers or filamentation.
Several concepts for the compression of ultrashort laser pulses to the few-cycle regime were recently proposed. Most promising among these are filamentation in gases as well as nonlinear propagation inside gas-filled hollow-core fibres. However, both methods are limited in terms of the accessible output pulse energy (typically below ~1 mJ), either by the onset of multiple filamentation for the first...
We experimentally demonstrate the revival of short lived femtosecond laser induced plasma channels in air by a nanosecond laser pulse up to several milliseconds after plasma recombination. Such revived plasma channel is generated over 50 cm using a Bessel-like nanosecond laser beam.
We experimentally demonstrate that high energy ultrashort pulses can be compressed through self-phase-modulation in hollow planar waveguides. The beam is guided in one transverse dimension and propagates free in other, allowing scalability to higher energies.
By focusing ultrashort laser pulses in air with axicon, long and continuous plasma channels can be formed. The channel length is significantly longer than that obtained by filamentation with lens of same effective focal distance.
We present two techniques for measuring the complete spatio-temporal intensity and phase, E(x,y,z, t), of an ultrashort pulse, one in and near a focus and the other for a single pulse.
Summary form only given. In this paper, we introduce an extremely simple, compact, and distortion-free single-prism pulse compressor using PBH71 and BK7 prisms. It simply involves a corner cube after the first (only) prism, yielding an inversion in the reflected beam and so effectively inverting the prism for the second pass. Then, using a periscope, it returns the beam through the prism and corner...
We demonstrate an ultrasimple, extremely broadband, alignment-free, and single-shot Transient-Grating Frequency-Resolved-Optical-Gating device using a mask to separate the input beam into three beams and a Fresnel biprism to cross and delay them.
We present a simplified, alignment-free version of spectral interferometry using optical fibers. Spectral resolution is significantly improved using spatial fringes, avoiding time-domain filtering. We demonstrate this technique by measuring temporal chirp and a 12-ps double-pulse.
A single-prism/corner-cube pulse compressor significantly simplifies alignment and tuning. Angle-tuning the prism wavelength-tunes and translating a corner cube varies group-delay dispersion, maintaining zero angular dispersion, zero pulse-front tilt, zero spatial chirp, and unity magnification.
Pulse-front tilt in ultrashort laser pulses is usually considered equivalent to angular dispersion. We prove, however, that the combination of spatial and temporal chirp also produces pulse-front tilt. We verify this experimentally using a GRENOUILLE.
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