A method of controlling a position at which laser beams used in flow cytometry impinge on a flow cell. The method includes directing each of the laser beams through a respective prism pair including a first and a second prism and. controlling a temperature of at least one of the first and second prisms. The first and second prisms are oriented such that an ellipticity of a laser beam passing through the prism pair is changed, and such that controlling the temperature of at least one of said first and second prisms results in a displacement of the laser beam along a direction corresponding to a minor transversal axis of the beam at the flow cell, wherein a position at which each of the plurality of laser beams impinges on the flow cell is controlled by controlling a temperature of at least one of the first and second prisms.
G01N 15/14 - Optical investigation techniques, e.g. flow cytometry
G02F 1/29 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the position or the direction of light beams, i.e. deflection
A method of controlling a position at which laser beams used in flow cytometry impinge on a flow cell is provided. The method comprises directing each of the laser beams through a respective prism pair comprising a first and a second prism. The method further comprises controlling a temperature of at least one of said first and second prisms of each prism pair. The first and second prisms of each prism pair are oriented such that an ellipticity of a laser beam passing through the prism pair is changed, and such that controlling the temperature of at least one of said first and second prisms results in a displacement of the laser beam passing through the prism pair along a direction corresponding to a minor transversal axis of the beam at the flow cell, wherein a position at which each of the plurality of laser beams impinges on the flow cell is controlled by controlling a temperature of at least one of the first and second prisms of each corresponding prism pair. A corresponding arrangement for use in flow cytometry is provided.
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
G01N 9/24 - Investigating density or specific gravity of materialsAnalysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
A laser arrangement including a laser element; a volume Bragg grating, VBG, for providing optical feedback to the laser element along a beam path; a polarizing beam splitter, PBS, arranged in the beam path between the laser element and the VBG; and a polarization-modifying element arranged in the beam path between the PBS and the VBG element; wherein the polarization-modifying element is structured and arranged to alter a polarization state of light reflected from the VBG such that the PBS is operative to divide said light reflected from the VBG into a first portion that provides the optical feedback to the laser element and a second portion that provides an output beam from the laser arrangement. Embodiments may be useful for low wavenumber Raman spectroscopy.
A multi-wavelength laser module including a base plate, a plurality of radiation sources mounted on the base plate, at least one telescope including a first lens and a second lens wherein the second lens is arranged at a distance from the first lens along a radiation beam path, thereby creating a telescopic effect. A beam angle correction plate is arranged between the first lens and the second lens in the radiation beam path, the beam angle correction plate being angled in relation to the radiation beam path so as to parallel shift the radiation beam inside the telescope and thereby adjust the pointing direction of the radiation beam after passage of the telescope. Further, a method for assembling a multi-wavelength laser system provided with telescopes with such beam angle correction plate.
A laser arrangement comprising a laser element; a volume Bragg grating, VBG, for providing optical feedback to the laser element along a beam path; a polarizing beam splitter, PBS, arranged in the beam path between the laser element and the VBG; and a polarization-modifying element arranged in the beam path between the PBS and the VBG element; wherein said polarization- modifying element is structured and arranged to alter a polarization state of light reflected from said VBG such that said PBS is operative to divide said light reflected from said VBG into a first portion that provides the optical feedback to the laser element and a second portion that provides an output beam from the laser arrangement. Embodiments of the present invention are particularly useful for low wavenumber Raman spectroscopy.
The invention relates to a multi-wavelength laser module (1) comprising a base plate, a plurality of radiation sources mounted on the base plate, at least one telescope (4) comprising a first lens (5) and a second lens (6) wherein the second lens (6) is arranged at a distance from the first lens along a radiation beam path, thereby creating a telescopic effect. A beam angle correction plate (7, 7', 7'') is arranged between the first lens (5) and the second lens (6) in the radiation beam path, the beam angle correction plate (7, 7', 7'') being angled in relation to the radiation beam path so as to parallel shift the radiation beam inside the telescope and thereby adjust the pointing 10 direction of the radiation beam after passage of the telescope. The invention further relates to a method for assembling a multi-wavelength laser system provided with telescopes with such beam angle correction plate (7, 7', 7'').
09 - Scientific and electric apparatus and instruments
10 - Medical apparatus and instruments
Goods & Services
Lasers, not for medical purposes, for use in the fields spectroscopy, bioinstrumentation, holography, metrology, particle analysis, quantum technology, public security, nanophotonics, interferometry, marking, and micromachining; the foregoing not used in connection with cutting, drilling, engraving, welding, marking, manufacturing, repairing, coding, trimming or otherwise machining processing materials or electronic components in the medical, automotive, semiconductor, electronic manufacturing and industrial manufacturing industries, or in the fields of hunting, sports, or golf Lasers, for medical purposes
A new principle for a tunable optical parametric oscillator (OPO) and a related method are disclosed. An OPO is tuned by setting the temperature of a non-linear element to select a desired signal/idler combination, and narrow-band operation is effected by tuning a birefringent filter in the OPO to a temperature setting at which the filter matches the selected signal/idler combination, wherein broad and stable tunability is obtained by virtue of at least two different temperature settings of the non-linear element being matched to a single common temperature setting of the birefringent filter.
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/093 - Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp focusing or directing the excitation energy into the active medium
H01S 3/108 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 3/102 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 5/06 - Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
H01S 3/08 - Construction or shape of optical resonators or components thereof
G02F 1/39 - Non-linear optics for parametric generation or amplification of light, infrared, or ultraviolet waves
H01S 5/10 - Construction or shape of the optical resonator
A new principle for a tunable optical parametric oscillator (OPO) and a related method are disclosed. An OPO is tuned by setting the temperature of a non-linear element to select a desired signal/idler combination, and narrow-band operation is effected by tuning a birefringent filter in the OPO to a temperature setting at which the filter matches the selected signal/idler combination, wherein broad and stable tunability is obtained by virtue of at least two different temperature settings of the non-linear element being matched to a single common temperature setting of the birefringent filter.
A method for assembling an optically pumped solid-state laser having an extended cavity. The method includes the steps of providing a casing, mounting a TEC and a base plate in the casing, and mounting a plurality of laser components on the base plate using a UV and heat curing adhesive. Once the laser components are correctly positioned and aligned on the base plate, the adhesive is pre-cured using UV radiation. Final curing of the adhesive is obtained by subjecting the entire laser package to an ambient temperature of at least 100° C. The base plate is preferably selected to have a CTE similar to that of the laser components in order to facilitate the high temperature curing. A preferred material for the base plate is AlSiC.
A method for assembling an optically pumped solid-state laser having an extended cavity is disclosed. The method comprises the steps of providing a casing (12, 13, 14, 202), mounting a TEC (16) and a base plate (17, 201) in the casing, and mounting a plurality of laser components (205-215) on the base plate using a UV and heat curing adhesive. Once the laser components are correctly positioned and aligned on the base plate, the adhesive is pre-cured using UV radiation. Final curing of the adhesive is obtained by subjecting the entire laser package to an ambient temperature of at least 100 °C. The base plate is preferably selected to have a CTE similar to that of the laser components in order to facilitate the high temperature curing. A preferred material for the base plate is AISiC.
H01L 23/34 - Arrangements for cooling, heating, ventilating or temperature compensation
H01L 25/16 - Assemblies consisting of a plurality of individual semiconductor or other solid-state devices the devices being of types provided for in two or more different subclasses of , , , , or , e.g. forming hybrid circuits
A laser arrangement is provided, in which a Lyot filter arrangement is operative to effect single mode operation. The birefringent element of the Lyot filter arrangement has a cavity folding mirror on one side thereof and a polarizing element on another side thereof, such that the free spectral range of the Lyot filter is improved. Preferably, the Lyot filter arrangement and the laser gain material are located in different branches of the folded cavity.
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
A laser is disclosed, which is suitable for efficient generation of continuous-wave laser light having a wavelength of about 400 nm or less. The short-wavelength light is generated by first frequency-doubling a fundamental wave, and then sum-frequency mixing the frequency-doubled wave and the fundamental wave. The non-linear interactions are effected by means of quasi-phasematching structures inside a resonant cavity where the fundamental wave is circulating. The sum-frequency mixing is effected using second or higher order quasi-phasematching, which allows for wider domains to be inverted for the quasi-phasematching structure compared to first order quasi-phasematching. Preferably, the sum-frequency mixing is effected using periodically poled stoichiometric lithium tantalate (PPSLT) for second or third order quasi-phasematching.
H01S 3/109 - Frequency multiplication, e.g. harmonic generation
H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
09 - Scientific and electric apparatus and instruments
10 - Medical apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
Lasers, not for medical purposes; optical apparatus and instruments. Lasers, for medical purposes. Scientific and technological services and research and design relating thereto; design and development of computer hardware and software.
