Abstract: A substrate suitable for SERS, including a metal body and located on a surface of the metal body a layer of nanoparticles, wherein the nanoparticles have an average diameter or size of 10 nm to 100 nm, and wherein the metal body has a thickness of at least 30 ?m beneath the surface with the nanoparticles is disclosed.

Abstract: The invention provides a method of producing a metal or metal oxide nanoparticle comprising mixing a metal salt, a metal chelating agent, a whey protein and a reducing saccharide in a solvent; heating and evaporating the solvent from said mixture to form a gel, thereby forming metal or metal oxide nanoparticles within the gel.

Abstract: A multifunctional laser device configured to be applicable as such in each of: multiple photon processes, nano structuring processes, optical coherence tomography, Terahertz (THZ) spectroscopy, THz imaging; or a combination of such processes; and comprising a mode-locked linear (X or Z-folded) fs laser resonator having a repetition rate of at least 300 MHz and 600 MHz at most and, thus, a corresponding short resonator length, said fs laser resonator further being a dispersive mirrors cavity having an average negative GDD (Group Delay Dispersion) in the spectral range of the laser operation, and being arranged to generate laser pulses with a pulse width of less than 30 fs, and comprising a pump laser operating at an optical output pump power of less than 2 W.

Abstract: The present disclosure relates to a laser crystal device (1) for short pulse lasers, comprising a container (4), the interior of which is sealed relative to the environment and which contains a technically pure atmosphere with windows (12, 13) in the side walls (12, 13) for the passage of laser radiation (16), which in operation passes through a laser crystal (6), wherein the window (12, 13) has an inclination of the Brewster angle to the beam path of the laser radiation (16) and a mounting (5) for the laser crystal (6) is provided within the container (4), the windows (12, 13) are inclined to each other by double the Brewster angle and are placed at an adequate distance from the laser crystal (6) position, with relation to the laser beam properties, wherein the beam cross section at the windows (12, 13) is sufficiently large in order to guarantee a peak intensity at the windows (12, 13) which is sufficiently reduced in relation to the peak intensity of the laser beam (16) at the laser crystal (6) for avoidin

Abstract: A mode-locked short pulse laser resonator including a pump laser beam input, a non-linear laser medium, a plurality of resonator mirrors as well as a first outcoupler mirror and a second outcoupler mirror, wherein the first outcoupler mirror is arranged for coupling out laser radiation having first spectral properties, and the second outcoupler mirror is arranged for coupling out laser radiation having second spectral properties which are different from the first spectral properties.

Abstract: A short pulse laser arrangement with, preferably, passive mode-locking, comprising a resonator containing a laser crystal and several mirrors, one of which forms a pump beam coupling-in mirror and one of which forms a laser beam out-coupling mirror, and a multiple reflexion telescope enlarging the resonator length, the resonator in operation having a positive averaged dispersion over a wavelength range concerned; the adjustment of the positive averaged dispersion of the resonator is effected by means of the mirrors of the resonator, at least a few of which are designed as dispersive mirrors.

Abstract: The present disclosure relates to a laser crystal device (1) for short pulse lasers, comprising a container (4), the interior of which is sealed relative to the environment and which contains a technically pure atmosphere with windows (12, 13) in the side walls (12, 13) for the passage of laser radiation (16), which in operation passes through a laser crystal (6), wherein the window (12, 13) has an inclination of the Brewster angle to the beam path of the laser radiation (16) and a mounting (5) for the laser crystal (6) is provided within the container (4), the windows (12, 13) are inclined to each other by double the Brewster angle and are placed at an adequate distance from the laser crystal (6) position, with relation to the laser beam properties, wherein the beam cross section at the windows (12, 13) is sufficiently large in order to guarantee a peak intensity at the windows (12, 13) which is sufficiently reduced in relation to the peak intensity of the laser beam (16) at the laser crystal (6) for avoidin

Abstract: An optical cable comprises a cable core (100) containing optical transmission elements (10) surrounding a centrally arranged strain relief element (20). Yarns (31) are arranged as a further strain relief element in a manner surrounding the cable core (100). The entire arrangement is surrounded by a cable sheath (400). A thermoplastic material into which vegetable fibers are embedded as a filler is used as materials for the conductor sleeves (2) of the optical transmission elements, the strain relief elements (20) and the cable sheath (400). The use of such vegetable-fiber-filled plastic materials makes it possible to improve the material properties of conductor sleeve, cable sheath and strain relief elements such as, for example, the shrinkage behavior of materials during production and also the transverse compressive and tensile strength.

Abstract: An optical cable comprises a cable core (100) containing at least one optical transmission element (10a, 10b). The cable core (100) is free of filler composition. It contains, as optical transmission elements, a plurality of tight-buffered conductors (10a) or a plurality of bundle conductors (10b) which are arranged around a centrally arranged strain relief element (20). The cable core (100) is surrounded by a sleeve (200), which is extruded or pumped around the cable core. The sleeve layer (200) contains a plastic material with which swellable materials, for example acrylates, are mixed as filler. A cable sheath (300) is extruded around the sleeve layer (200). The swellable filler embedded in the sleeve layer brings about an increase in the volume of the sleeve layer (200) upon contact with water, whereby the cable core (100) is sealed against penetrating moisture.

Abstract: A mode-locked short pulse laser resonator including a pump laser beam input, a non-linear laser medium, a plurality of resonator mirrors as well as a first outcoupler mirror and a second outcoupler mirror, wherein the first outcoupler mirror is arranged for coupling out laser radiation having first spectral properties, and the second outcoupler mirror is arranged for coupling out laser radiation having second spectral properties which are different from the first spectral properties.

Abstract: A non-round fiber optic cable that has improved crush performance is disclosed. The fiber optic cable includes at least one optical fiber, at least one strength element, and a cable jacket having a cavity. The at least one optical fiber is disposed within the cavity. The cable jacket further includes a concave upper wall and a concave lower wall disposed on opposite sides of the cavity, thereby improving the crush performance along the major axis of the optical fiber cable. In other embodiments, the fiber optic cable is a portion of a cable assembly.

Abstract: A non-round fiber optic cable that has improved crush performance is disclosed. The fiber optic cable includes at least one optical fiber, at least one strength element, and a cable jacket having a cavity. The at least one optical fiber is disposed within the cavity. The cable jacket further includes a concave upper wall and a concave lower wall disposed on opposite sides of the cavity, thereby improving the crush performance along the major axis of the optical fiber cable. In other embodiments, the fiber optic cable is a portion of a cable assembly.

Abstract: The invention relates to a short-pulse laser device (11) with a preferably passive mode coupling. Said device comprises a resonator (12) which contains a laser crystal (14) in addition to several mirrors (M1-M7, OC) that define a long resonator arm (17) and a short resonator arm (16), one (M1) of said mirrors forming a pump beam coupling-in mirror and another (OC) forming a laser beam output coupler and comprising a multiple reflection telescope (18) that increases the length of the resonator and is allocated to the resonator arms (16, 17). Said telescope is constructed using mirrors (25, 26), in order to reflect a laser beam (15) that is coupled into the space between them back and forth several times, prior to being decoupled back into the other resonator, whereby sequential eccentric reflection points (1 to 8; 1? to 8?) on the mirrors (25, 26) are offset in relation to one another.

Abstract: A multiple-reflection delay line member for a laser beam, including mirror elements for the multiple reflection of the laser beam to reduce the dimensions of a laser resonator at a predetermined optical length, wherein the mirror elements are comprised of two oppositely arranged, longitudinally extending polished surfaces of a glass element which extends in one direction and which further comprises a polished laser beam entry surface as well as a polished laser beam exit surface, wherein the mirror element surfaces of the glass element are located between the entry surface and the exit surface and, with the laser beam, form an angle that at least equals the critical angle for total reflection, whereas the entry surface and the exit surface with the laser beam of the glass element define an angle that is smaller than the critical angle for total reflection.

Abstract: A short pulse laser arrangement (11) with, preferably, passive mode-locking, comprising a resonator (12) containing a laser crystal (14) and several mirrors (M1-M7; OC), one of which forms a pump beam coupling-in mirror (M1) and one of which forms a laser beam out-coupling mirror (OC), and a multiple reflexion telescope (18) enlarging the resonator length, the resonator (12) in operation having a positive averaged dispersion over a wavelength range concerned; the adjustment of the positive averaged dispersion of the resonator (12) is effected by means of the mirrors (M1-M7, OC) of the resonator (12), at least a few of which are designed as dispersive mirrors.

Abstract: A dental laser arrangement switchable between different modes of operation, the arrangement including a laser device operable as a laser oscillator and as a laser amplifier. The laser device includes a laser resonator having a pump unit and an active modelocker as well as an optic loss element that introduces selective losses in the resonator. The laser arrangement further includes a laser beam-out-coupling unit. The modelocker is connected to a control circuit for switching between a CW-mode of operation for coagulating soft tissue, in which the modelocker is switched off, and two short-pulse modes of operation in which high frequency signals of equal frequencies, but different powers are applied by the control circuit to the modelocker so as to generate laser pulses of a pre-determined duration.

Abstract: The invention relates to a device for generating terahertz (THz) radiation comprising a short pulse laser (1) with mode coupling to which a pump beam (3) is supplied, and comprising a semiconductor component equipped with a resonator mirror (M4). This semiconductor component serves to derive the THz radiation based on incident laser pulses. The resonator mirror (M4), preferably a resonator end mirror, is provided with a semiconductor layer (8), which is partially transparent to the laser radiation of the short pulse laser (1), whose absorption edge is lower than the energy of the laser radiation of the short pulse laser (1) and on which the electrodes (9, 10) that can be connected to a bias voltage source are placed in order to generate and radiate the THz radiation in the electric field.

Abstract: A cooling device for an optical amplifier or oscillator has Peltier elements enclosed in a housing with an optical crystal and extract heat from the optical crystal. The housing is sealed and can contain a desiccant for removing moisture and preventing particle deposition. Alternately, the housing can be evacuated with a vacuum to maintain a clean operating environment. The housing holds a Brewster window at a Brewster angle with an inident laser beam to permit passage of the laser beam. The housing also can be arranged on a platform providing liquid cooling.

Abstract: A cooling device for an optical amplifier or oscillator has Peltier elements enclosed in a housing with an optical crystal and extract heat from the optical crystal. The housing is sealed and can contain a desiccant for removing moisture and preventing particle deposition. Alternately, the housing can be evacuated with a vacuum to maintain a clean operating environment. The housing holds a Brewster window at a Brewster angle with an inident laser beam to permit passage of the laser beam. The housing also can be arranged on a platform providing liquid cooling.

Abstract: The invention relates to a short-pulse laser device (11) with a preferably passive mode coupling. Said device comprises a resonator (12) which contains a laser crystal (14) in addition to several mirrors (M1-M7, OC) that define a long resonator arm (17) and a short resonator arm (16), one (M1) of said mirrors forming a pump beam coupling-in mirror and another (OC) forming a laser beam output coupler and comprising a multiple reflection telescope (18) that increases the length of the resonator and is allocated to the resonator arms (16, 17). Said telescope is constructed using mirrors (25, 26), in order to reflect a laser beam (15) that is coupled into the space between them back and forth several times, prior to being decoupled back into the other resonator, whereby sequential eccentric reflection points (1 to 8; 1? to 8?) on the mirrors (25,26) are offset in relation to one another.