Abstract:
The present disclosure describes broadband optical emission sources that include a stack of semiconductor layers, wherein each of the semiconductor layers is operable to emit light of a different respective wavelength; a light source operable to provide optical pumping for stimulated photon emission from the stack; wherein the semiconductor layers are disposed sequentially in the stack such that a first one of the semiconductor layers is closest to the light source and a last one of the semiconductor layers is furthest from the light source, and wherein each particular one of the semiconductor layers is at least partially transparent to the light generated by the other semiconductor layers that are closer to the light source than the particular semiconductor layer. The disclosure also describes various spectrometers that include a broadband optical emission device, and optionally include a tuneable wavelength filter operable to allow a selected wavelength or narrow range of wavelengths to pass through.
Abstract:
An instrument for scanning a specimen has a two-dimensional sensor array, the sensor array containing a mosaic color filter array or a scanning color filter array. The instrument can be operated in fluorescence or in brightfield. The scanning color filter array has the same color throughout each row with adjacent rows having different colors.
Abstract:
A protective sheath having a closed end and an open end is sized to receive a hand held spectrometer. The spectrometer can be placed in the sheath to calibrate the spectrometer and to measure samples. In a calibration orientation, an optical head of the spectrometer can be oriented toward the closed end of the sheath where a calibration material is located. In a measurement orientation, the optical head of the spectrometer can be oriented toward the open end of the sheath in order to measure a sample. To change the orientation, the spectrometer can be removed from the sheath container and placed in the sheath container with the calibration orientation or the measurement orientation. Accessory container covers can be provided and placed on the open end of the sheath with samples placed therein in order to provide improved measurements.
Abstract:
The bandwidth selection mechanism includes a first actuator mounted on a second face of a dispersive optical element, the second face being opposite from a reflective face, the first actuator having a first end coupled to a first end block and a second end coupled to a second end block, the first actuator being operative to apply equal and opposite forces to the first end block and the second end block to bend the body of the dispersive optical element along the longitudinal axis of the body and in a first direction normal to the reflective face of the dispersive optical element. The bandwidth selection mechanism also includes a second actuator being operative to apply equal and opposite forces to bend the body along the longitudinal axis of the body, in a second direction perpendicular to the reflective face of the dispersive optical element.
Abstract:
Ein Spektrometer (1) umfasst eine Lichtquelle (2), einen Monochromator (3) mit mindestens einem Beugungsgitter (4), ein Monochromator-Gehäuse (5), einen Order-Sorting-Filter (7), eine Mikroplatten-Aufnahme (12) und eine Steuerung (6). Der Order-Sorting-Filter (7) dieses Spektrometers (1) umfasst ein Substrat (23), eine erste optische Dünnschicht (24) und eine zweite optische Dünnschicht (25), wobei die erste optische Dünnschicht (24) auf einer ersten Oberfläche (26) und die zweite optische Dünnschicht (25) auf einer zweiten Oberfläche (27) des Substrats (23) räumlich teilweise überlappend und interferenzfrei angeordnet sind. In einem Raster-Verfahren zum Erfassen des Absorptions-Spektrums von in Wells (14) von Mikroplatten (13) untersuchten Proben wird ein mit einem entsprechenden Order-Sorting-Filter ausgerüstetes Spektrometer (1) verwendet.
Abstract:
Ein Monochromator (1) umfasst zumindest ein gegenüber einfallendem Licht einer Lichtquelle (3) drehbar ausgebildetes optisches Gitter (2); eine Antriebs-Einheit (8) zum Drehen des optischen Gitters (2) mittels einer mit diesem verbundenen Antriebs-Stange (7) um eine Längsachse (9); und eine Steuereinheit (10), welche die Antriebs-Einheit (8) und damit die Drehung des optischen Gitters (2) steuert. Die Antriebs-Einheit (8) des Monochromators (1) umfasst zudem ein erstes Dämpfungs-Element (11) mit zumindest einer elektrisch leitfähigen Fläche und ein zweites Dämpfungs-Element (12), das zumindest ein Magnetfeld mit einer magnetischen Achse (14) bereitstellt, welche die elektrisch leitfähige Fläche durchdringt. Dabei ist das erste oder zweite Dämpfungs-Element (11,12) mit der Antriebs-Stange (7) fest verbunden und mit dieser um deren Längsachse (9) drehbar in Relation zum zweiten oder ersten Dämpfungs-Element (12,11) ausgebildet.
Abstract:
A sequential wavefront sensor comprises a light beam scanning module (212), a sub-wavefront focusing lens (220), a detector (222) with more than one photosensitive area and a processor for calculating the sequentially obtained centroids of a number focused light spots from the sub-wavefronts to determine the aberration of the input wavefront. A sequential wavefront sensing method comprises the steps of: sequentially projecting a number of sub-wavefronts onto a sub-wavefront focusing lens and a detector with more than one photosensitive areas, calculating the centroid of the focused light spot from each sub-wavefront, and processing the centroid information to determine the aberration of the wavefront. In particular, a method for auto-focusing and/or auto-astigmatism-correction comprises the steps of sequentially projecting a number of sub-wavefronts around an annular ring of a wavefront to a sub-wavefront focusing lens and a detector, calculating the centroid of focused light spot from each sub-wavefront to figure out the centroid trace and hence the defocus and/or astigmatism, adjusting the focus and/or astigmatism of the optical imaging system before the wavefront sensor so that the measured defocus and/or astigmatism is minimized.