Abstract: The present invention relates to a device for outcoupling of light in an external cavity laser, which external cavity laser comprises at least one light source, at least one wavelength selective feedback element, at least one polarization selective beam-splitting optical element, and at least one Faraday-rotator element.

Abstract: The invention relates to a device and method for tuning the wavelength of the light in an external cavity laser. The external cavity laser comprises an optically amplifying semiconductor chip, a first reflecting surface, an Anti-Reflection (AR) coated semiconductor chip facet, a diffraction grating on which at least part of the beam originating from the AR coated semiconductor chip facet is incident and diffracted back to the optically amplifying semiconductor chip, means for collimating the light emitted from the AR coated semiconductor chip facet towards the diffraction grating, and a movable part. By the movement of the moveable part, the wavelength of the light can be turned in the external cavity laser. The movable part of the external cavity laser exhibits a rotational movement relative to the optical axis of the external movement being actuated by an electrodynamic force generated within an integral section of the moveable part.

Abstract: Arrangement for generating well-defined beam distribution over a surface or in a volume by means of a diffraction optical element (17). The arrangement includes at least one laser source (14), an optical filter means, preferably a mode-selective filter (16), a diffraction optical component (17) as well as possible coupling and focusing elements (15, 18). Said components, means and elements are positioned and fixed in a common unit and that the filter (16) is so developed that the beam from the source (14) after passage through said mode-selective filter (16) occurs essentially in one mode.

Abstract: Method to arrange and adjust a laser that is stable with respect to external and internal influences, and which comprises at least three optical components consisting of a laser element (1), which can generate optical radiation within a wavelength band .lambda..sub.1 -.lambda..sub.2, an optical collimator (2) that inside the laser collimates radiation emitted from the laser element, and a plane reflection grating (3) with parallel grating grooves, arranged such that the latter together with a flat reflection surface, which can be one end surface of the laser element, forms a resonator, that selects the radiation wavelength emitted by the laser. At least one optical component, which for instance can be (1), (2) or (3) is fixedly mounted in a holder, that for the purpose of adjusting the laser to a lasing condition can be turned about an axis, that is fixed in the device, such that the angle .PHI.

Abstract: The present invention relates to a device for lash free positioning of especially components used in optical and optoelectronical equipments relatively to a fixed reference unit using at least two interconnected elastic blocks each consisting of two base elements placed at a distance from each other and interconnected by elastic elements, constituting a cantilevered system as related to one of the base elements.

Abstract: Method and apparatus to ensure tuning without mode hopping of the resonator frequency and tuning of the Q-value of an optical resonator of the type comprising a partially reflecting resonator mirror (2) and a movable reflecting optical grating, with grooves (GR) parallel to the resonator mirror, intended to function as a wavelength selective reflector and which may comprise optical elements between the mirror and the grating, said optical elements being intended for collimation, amplification (4) and filtering of the radiation in the resonator, so that when changing the resonance wavelength (.lambda.) of the resonator or its Q-value, the grating is moved in such a way that a line (C) on the grating which is defined at a tuned initial position of the resonator by the intersection of the plane of grating grooves (M) and the virtual mirror plane (5) of the resonator mirror, remains at a distance less than .lambda.