Abstract: The present invention relates to a micro resonator assembly (16), comprising a body (2) which is covered with a layer (6) of at least one material at least at an intended point of interaction between the micro resonator (4) and an associated coupling element (10, 12) when using the micro resonator (4), whereby the layer (6) has a transparent thickness (8) which corresponds to a desired distance (8) between the micro resonator (4) and an associated coupling element (10, 12) at least at the intended point (14) of interaction, and to a manufacturing process therefor.

Abstract: A laser apparatus for providing a stabilized multi mode laser beam includes an external cavity for providing an optical path for generating a laser beam which is stimulated by a gain medium, where the external cavity has first spectral characteristics, and a mode-selecting filter positioned within the optical path and having second spectral characteristics. The first characteristics and the second characteristics are adjusted to each other, so that the laser beam has at least two selected modes.

Abstract: A wavelength tunable laser unit has a laser mode selection, and is adapted to provide a laser signal in accordance with one or more laser control parameters. For operating the laser unit, the laser signal is swept in a wavelength range, a laser operation signal indicative of the laser unit's operation during the sweep is received, and the laser operation signal is analyzed for detecting an indication of a mode hop occurred in the generated laser signals during the sweep. At least one correction value is determined based on the detected mode hop indication, and at least one of the one or more laser control parameters, applicable for a next wavelength sweep, is modified based on the determined at least one correction value.

Abstract: A method of manipulating a laser source, includes analyzing an optical signal generated by the laser source, evaluating on the basis of the analysis an actual indicator corresponding with an actual value of a tuning velocity of the laser source, comparing the actual indicator with a desired indicator corresponding with a desired value of the tuning velocity to detect a deviation of the actual value of the tuning velocity from the desired value of the tuning velocity, and compensating the deviation if any by manipulating at least one parameter influencing the signal of the laser source.

Abstract: An apparatus and to a method of monitoring an interferometer, comprising the steps of: coupling a first optical signal into the interferometer and into a wavelength reference element, detecting a first resulting interference signal being a result of interference of parts of the first optical signal in the interferometer, detecting a resulting reference signal of the wavelength reference element, the resulting reference signal being a result of interaction of the first optical signal with the wavelength reference element, and comparing the first resulting interference signal with the resulting reference signal to detect a drift of the interferometer, if any.

Abstract: A laser being tunable in wavelength includes a first reflecting unit and a second reflecting unit, both reflecting units being arranged to at least partially reflect an incident beam of electromagnetic radiation towards each other, an optical path of said beam of electromagnetic radiation within said cavity, which is defined in length by said first and second reflecting unit, a dispersive device, which is arranged, such that a portion of said optical path of said beam of electromagnetic radiation traverses through said dispersive device, wherein said dispersive device comprises a dispersive characteristic representing a functional dependence of an optical path length of said portion with respect to wavelength of said electromagnetic radiation, wherein said optical path length increases with an increasing wavelength of said electromagnetic radiation.

Abstract: There is provided a gas cell. The gas cell has an optical fiber that includes a first hole that contains a first reference gas that absorbs a first wavelength of light, and a second hole having a content selected from the group consisting of (a) a vacuum and (b) a second reference gas that absorbs a second wavelength of light.

Abstract: An apparatus and method of controlling an optical signal includes superimposing at least one optical reference signal and the optical signal to obtain at least one interference signal having an actual beat frequency, and pre-selecting one or more of the at least one interference signals using a predetermined bandwidth and a filter characteristic that is asymmetric with respect to an actual frequency of the optical signal, to determine a position of the optical signal relative to the at least one optical reference signal.

Abstract: An apparatus and to a method of monitoring an interferometer, comprising the steps of: coupling a first optical signal into the interferometer and into a wavelength reference element, detecting a first resulting interference signal being a result of interference of parts of the first optical signal in the interferometer, detecting a resulting reference signal of the wavelength reference element, the resulting reference signal being a result of interaction of the first optical signal with the wavelength reference element, and comparing the first resulting interference signal with the resulting reference signal to detect a drift of the interferometer, if any.

Abstract: A laser apparatus for providing a stabilized multi mode laser beam includes an external cavity for providing an optical path for generating a laser beam which is stimulated by a gain medium, where the external cavity has first spectral characteristics, and a mode-selecting filter positioned within the optical path and having second spectral characteristics. The first characteristics and the second characteristics are adjusted to each other, so that the laser beam has at least two selected modes.

Abstract: A wavelength tunable laser resonator includes first and second resonator end reflectors for reflecting a beam of electromagnetic radiation towards each other, the first and second resonator end reflectors defining a resonator having an optical path with a length, a gain medium for generating and/or amplifying and emitting the beam towards the first and second resonator end reflectors, arranged within the resonator, and a diffractive optical element within the optical path to filter a wavelength of the beam and to focus a portion of the beam towards the gain medium. One of the resonator end reflectors are movable with respect to other optical elements within the resonator for increasing or decreasing the length of the optical path. The diffractive optical element is movable with respect to other optical elements within the resonator for adapting the filtered wavelength to the increase or decrease of the optical path length.

Abstract: A laser being tunable in wavelength a first reflecting unit and a second unit, both reflecting units being arranged to at least partially reflect an incident beam of electromagnetic radiation towards each other, an optical path of said beam of electromagnetic radiation within said cavity, which is defined in length by said first and second reflecting unit a dispersive device, which is arranged, such that a portion of said optical path of said beam of electromagnetic radiation traverses through said dispersive device, wherein said dispersive device comprises a dispersive characteristic representing a functional dependence of an optical path length of said portion with respect to wavelength of said electromagnetic 6radiation, wherein said optical path length increases with an increasing wavelength of said electromagnetic radiation.

Abstract: A laser source includes a laser medium having a back facet and a front surface, whereby the laser medium is adapted to emit a laser beam through the front surface into an external cavity defined in length by a cavity end mirror reflecting the laser beam back towards the laser medium. A wavelength tunable filter is arranged between the laser medium and the cavity end mirror adapted for tuning the wavelength of the laser beam. The laser medium, the wavelength tunable filter, and the cavity end mirror are arranged in a spatially linear cavity structure substantially in a line without angular redirection of the laser beam in the cavity between the laser medium and the cavity end mirror. At least one portion of the laser beam within the cavity after passing the wavelength tunable filter and before again passing the laser medium is coupled out as an output beam of the laser source, and the cavity end mirror is provided to be partly transparent for coupling out a first output beam.

Abstract: A wavelength tunable laser unit has a laser mode selection, and is adapted to provide a laser signal in accordance with one or more laser control parameters. For operating the laser unit, the laser signal is swept in a wavelength range, a laser operation signal indicative of the laser unit's operation during the sweep is received, and the laser operation signal is analyzed for detecting an indication of a mode hop occurred in the generated laser signals during the sweep. At least one correction value is determined based on the detected mode hop indication, and at least one of the one or more laser control parameters, applicable for a next wavelength sweep, is modified based on the determined at least one correction value.

Abstract: A gain chip for a laser includes a stack of layers. The stack has a first layer with light emitting quantum nanostructures of a first center emission wavelength, and a second layer on the first layer with light emitting quantum nanostructures of a second center emission wavelength.

Abstract: The invention relates to a method of tuning a laser, comprising the steps of: providing a laser beam (4) in an external cavity (2) having a dispersion element (10) for selecting at least one mode of the laser, varying the wavelength characteristic of the dispersion element (10).

Abstract: A connecting device for providing an optical connection between an apparatus comprising a apparatus port and provided for receiving and/or sending optical signals, and at least one optical fiber comprising a connector. The connecting device comprises a support plate supporting at least one adapter. The adapter comprises an adapter contact adapted for a plug connection with the apparatus port of the apparatus, and a connector contact adapted for a plug and/or screw connection with the connector of the fiber. The support plate provides a grip for manually plugging in/off all of its adapters simultaneously into/from the respective apparatus ports.

Abstract: A setup for providing an optical contact adapted for guiding an optical signal comprises an optical waveguide being adapted for guiding the optical signal and comprising a tip on an end of the waveguide, wherein the tip comprises a transparent elastic material covering the end. A detector is provided for detecting a substantial alignment between the waveguide and an optical path within a device under test, and a first moving unit is used to move the waveguide laterally relative to a longitudinal direction of the waveguide and the device under test until the detector substantially detects the alignment. A second moving unit is adapted to reduce the distance between the tip and the device under test until the tip comes in physical contact with the device under test when the detector has detected alignment.

Abstract: An apparatus and a method of determination of at least one optical parameter of an optical signal includes providing a beam of the optical signal having a diameter, manipulating the beam, the manipulation having polarization properties, the properties being dependent of the position in the beam laterally with respect to a direction of propagation of the beam during manipulation, detecting in intensities at least three parts of the beam in their dependence of the position in the beam laterally with respect to a direction of propagation of the beam during detection.

Abstract: An apparatus for processing an insulated fiber includes an optical fiber provided with insulation a retention device, which clamps the insulated fiber placed inside it, and a holder-bracket assembly comprising two holder brackets, between which a projecting section of the insulated fiber is located in a starting position beyond the retention device and is clamped in the retention device, which can be adjusted in relation to each other and perpendicular to fiber and which hold a section of the fiber insulation to be removed in a holding position. A cutting device is provided that cuts into the insulation to be removed perpendicular to the fiber. The retention device and the holder-bracket assembly can be adjusted in relation to each other, parallel to the fiber, during which the fiber is fixed in relation to the retention device, while the cut-off insulation is fixed in relation to the holder-bracket assembly.