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Fiber waveguide arrays as model system for discrete optics

Optical waveguide arrays consisting of a two-dimensional arrangement of weakly coupled waveguides represent the basis of the new research field of discrete optics. For studying the nonlin-ear pulse dynamics,...

Spatial manipulation of magnetic damping in ferromagnetic-antiferromagnetic films by ion irradiation

The static and dynamic magnetic properties of ferromagnetic-antiferromagnetic thin film stacks are manipulated in a controlled way by local ion treatment. Low fluence Ni-ion irradiation is used to adjust...

Picosecond kinetic confirmation of overlapping Ca cluster and MNa absorption bands in UV grade CaF2

The ArF laser induced absorption feature between 450 and 700 nm observed in the bulk of mono crystalline calcium fluoride (CaF2) upon prolonged 193 nm irradiation is shown to have two origins: The first...

Real-time determination of laser beam quality by modal decomposition

We present a real-time method to determine the beam propagation ratio M2 of laser beams. The all-optical measurement of modal amplitudes yields M2 parameters conform to the ISO standard method. The experimental...

Evolution dynamics of discrete-continuous light bullets

We investigate experimentally and numerically the propagation of light bullets (LBs) excited in two-dimensional fiber arrays. The combination of nonlinear self-frequency shift, wavelength dependence of...

Tuned Transition from Quantum to Classical for Macroscopic Quantum States

The boundary between the classical and quantum worlds has been intensely studied. It remains fascinating to explore how far the quantum concept can reach with use of specially fabricated elements. Here...

Influence of Tm- or Er-codoping on the photodarkening kinetics in Yb fibers

We investigated photodarkening (PD) parameters of Yb/Al-doped silica fibers in dependence on the concentration of additional rare earth ions like Tm or Er. It is found that both, Tm and Er cause a decrease...

Geoarchaeology in the steppe: First results of the multidisciplinary Mongolian-German survey project in the Orkhon Valley, Central Mongolia

High resolution (NA=0.8) in lensless in-line holographic microscopy with glass sample carriers

For lensless digital in-line holographic microscopy a high resolution corresponding to a numerical aperture of 0.8 is reached using the tile superposition propagation technique previously presented by...

In line gas sensor based on a photonic band gap fiber with laser drilled lateral micro channels

The fabrication, characterization and gas sensor application of a hollow core photonic band gap fiber (HC-PBGF) with laser drilled lateral micro channels will be described. The HC-PBGF was tailor-made...