Abstract: The invention relates to a blood oximeter for measuring the oxygenation and at least one other parameter of flowing blood in living tissue. According to the invention, the blood oximeter comprises two lightsources (2, 3) emitting light of different wavelengths into tissue, and preferably a light detector (4) for detecting a transmitted and/or reflected part of the light emitted into the tissue, wherein at least one of the light sources is a laser with a laser cavity emitting a laser beam, the laser being adapted to allow a part of the laser beam which is scattered by the tissue to re-enter into the laser cavity, and wherein a laser beam sensor (7, 8) for measuring the light emitted from the laser is provided, the laser beam sensor (7, 8), thus, obtaining a signal which varies in accordance with the self-mixing interferometric effect between the original laser beam and the scattered laser beam.

Abstract: The invention relates to a blood oximeter for measuring the oxygenation and at least one other parameter of flowing blood in living tissue. According to the invention, the blood oximeter comprises two lightsources (2, 3) emitting light of different wavelengths into tissue, and preferably a light detector (4) for detecting a transmitted and/or reflected part of the light emitted into the tissue, wherein at least one of the light sources is a laser with a laser cavity emitting a laser beam, the laser being adapted to allow a part of the laser beam which is scattered by the tissue to re-enter into the laser cavity, and wherein a laser beam sensor (7, 8) for measuring the light emitted from the laser is provided, the laser beam sensor (7, 8), thus, obtaining a signal which varies in accordance with the self-mixing interferometric effect between the original laser beam and the scattered laser beam.

Abstract: It is described a device (100) for analyzing biological cell material (115). The device (100) comprises a light source arrangement (120), which is adapted for directing a first (131) and a second illumination light (132) towards the cell material (115), wherein the first (131) and the second (132) illumination light comprises a first and a second spectral radiation component, respectively. The device (100) further comprises a detector arrangement (170), which is adapted for receiving a first measurement light (151) based on a first interaction of the first illumination light (131) with the cell material (115) and a second measurement light (152) based on a second interaction of the second illumination light (152) with the cell material (115).

Abstract: A method and an apparatus for scanning data stored along a track (16) on an optical storage medium (10) are provided. A light beam (12) is projected on the optical storage medium, thereby creating a scanning spot (14) that essentially follows the track (10). The relative position of the scanning spot (14) and the track (16) are varied in a radial direction. The variation of this positions occurs at a frequency v of v =?. S.4- NA/?, wherein NA is the numerical aperture of the light beam (12), X is the C wavelength of the light, S is the scanning speed, and ??0.01. The scanning spot is generated by a wavelength change is translated into a displacement of the beam by a pair of gratings.