Abstract: The invention relates to an apparatus for controlling the quality of transparent objects, comprising at least one light source being adapted to illuminate the object, and at least one image capturing device, by means of which at least one image of the object can be detected, wherein the apparatus comprises further at least one reflector, wherein the reflector and the image capturing device define a beam path, wherein the reflector, the image capturing device, and the light source are arranged such that the object can be arranged between the reflector, on the one hand, and the image capturing device and the light source, on the other hand, such that a single sheet of material is located in the beam path. Furthermore, the invention relates to a corresponding method for controlling the quality of transparent objects.

Abstract: The invention disclosure describes a manufacturing method for realizing so-called JBS areas for a unipolar power diode on the basis of diamond. In this special method, an n-doped layer is applied to the typically p-doped drift region, e.g. by means of epitaxial layer growth. The applied n-doped layer is then removed again in defined areas. A photolithographic mask may be applied and the n-doped layer is removed by dry or wet chemical etching. Having structured the JBS areas, the Schottky metal is applied to the entire surface. The resulting JBS structure shields an electric field generated by an applied reverse voltage from the Schottky transition. The reverse voltage from which the Schottky transition is fully shielded can be adjusted by altering the distance between the JBS areas.

Abstract: The invention relates to a method and a device for producing at least one fiber Bragg grating in a waveguide, wherein the waveguide has at least one core having a first refractive index and the fiber Bragg grating contains a plurality of spatial regions which each occupy a partial volume of the core and have a second refractive index, wherein the spatial regions are each produced by the action of laser radiation on a partial volume of the core, wherein the laser radiation contains a plurality of pulse trains each containing a plurality of individual pulses, wherein the time interval between successive individual pulses is smaller than the time interval between successive pulse trains and the time interval between successive individual pulses is chosen between 10 ns and 100 ps or the pulse train has a duration of 50 fs to 50 ps.

Abstract: The invention relates to a radiation source, comprising at least one semiconductor substrate, on which at least two field-effect transistors are formed, which each contain a gate electrode, a source contact, and a drain contact, which bound a channel, wherein the at least two field-effect transistors are arranged adjacent to each other on the substrate, wherein each field-effect transistor has exactly one gate electrode and at least one source contact and/or at least one drain contact is arranged between two adjacent gate electrodes, wherein a ballistic electron transport can be formed in the channel during operation of the radiation source. The invention further relates to a method for producing electromagnetic radiation having a vacuum wavelength between approximately 10 ?m and approximately 1 mm.

Abstract: An analog-digital converter has an optical input stage configured to convert an analog input signal (S(t)) into a phase-modulated optical signal and to supply it to a hybrid coupler having a plurality of output waveguides, each being connected to at least one photodiode. The photodiodes are each connected to the input of an associated analog-digital converter via which an analog electrical input signal is convertible into a digital output signal. An output stage is configured to form the digital data stream at the output from the digital output signals of the analog-digital converter, and the output stage may be configured to select the output signal of the analog-digital converter which lies within a predefinable range of the amplitude and has a predefinable slope and/or is larger than a predefinable adjacent output signal.

Abstract: The invention relates to a fiber-optic sensor comprising an optical waveguide having at least one first core and a cladding surrounding the first core, wherein the first core extends substantially over the entire length of the optical waveguide, wherein the sensor has at least one second core which is at least partly surrounded by the cladding, wherein the longitudinal extent of the second core is less than the total length of the optical waveguide and at least one Bragg grating is introduced into the second core. Furthermore, the invention relates to a use of the fiber-optic sensor.

Abstract: The invention relates to a method and a device for producing at least one fibre Bragg grating in a waveguide, wherein the waveguide has at least one core having a first refractive index and the fibre Bragg grating contains a plurality of spatial regions which each occupy a partial volume of the core and have a second refractive index, wherein the spatial regions are each produced by the action of laser radiation on a partial volume of the core, wherein the laser radiation contains a plurality of pulse trains each containing a plurality of individual pulses, wherein the time interval between successive individual pulses is smaller than the time interval between successive pulse trains and the time interval between successive individual pulses is chosen between 10 ns and 100 ps or the pulse train has a duration of 50 fs to 50 ps.