Patents Assigned to Cobolt AB
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Publication number: 20230243733Abstract: 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.Type: ApplicationFiled: April 29, 2021Publication date: August 3, 2023Applicant: Cobolt ABInventors: Magnus RÅDMARK, Gunnar ELGCRONA, Håkan KARLSSON
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Patent number: 11482832Abstract: 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.Type: GrantFiled: June 30, 2017Date of Patent: October 25, 2022Assignee: COBOLT ABInventors: Gunnar Elgcrona, Magnus Rådmark, Håkan Karlsson
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Publication number: 20200412091Abstract: 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.Type: ApplicationFiled: November 17, 2017Publication date: December 31, 2020Applicant: Cobolt ABInventors: Gunnar ELGCRONA, Magnus RÅDMARK, Håkan KARLSSON
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Publication number: 20190252850Abstract: 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.Type: ApplicationFiled: June 30, 2017Publication date: August 15, 2019Applicant: Cobolt ABInventors: Gunnar ELGCRONA, Magnus RÅDMARK, Håkan KARLSSON
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Patent number: 9685753Abstract: 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.Type: GrantFiled: May 26, 2014Date of Patent: June 20, 2017Assignee: COBOLT ABInventors: Jonas Hellström, Peter Jänes
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Publication number: 20160111848Abstract: 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.Type: ApplicationFiled: May 26, 2014Publication date: April 21, 2016Applicant: COBOLT ABInventors: Jonas HELLSTRÖM, Peter JÄNES
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Patent number: 8178371Abstract: 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.Type: GrantFiled: June 20, 2011Date of Patent: May 15, 2012Assignee: Cobolt ABInventors: Jonas Hellström, Gunnar Elgcrona, Kenneth Joelsson
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Publication number: 20110244608Abstract: 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.Type: ApplicationFiled: June 20, 2011Publication date: October 6, 2011Applicant: COBOLT ABInventors: Jonas HELLSTRÖM, Gunnar ELGCRONA, Kenneth JOELSSON
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Patent number: 7801188Abstract: 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.Type: GrantFiled: April 2, 2007Date of Patent: September 21, 2010Assignee: Cobolt ABInventors: Håkan Karlsson, Jonas Hellström
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Publication number: 20100054289Abstract: 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, 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.Type: ApplicationFiled: August 29, 2008Publication date: March 4, 2010Applicant: COBOLT ABInventors: Jonas Hellstrom, Gunnar Elgcrona, Kenneth Joelsson
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Patent number: 7633978Abstract: 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.Type: GrantFiled: June 13, 2006Date of Patent: December 15, 2009Assignee: Cobolt ABInventors: Jonas Hellström, Gunnar Karlsson, Håkan Karlsson
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Publication number: 20090268763Abstract: 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.Type: ApplicationFiled: June 13, 2006Publication date: October 29, 2009Applicant: COBOLT ABInventors: Jonas Hellstrom, Gunnar Karlsson, Hakan Karlsson
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Patent number: 7551653Abstract: A laser arrangement comprising a first and a second resonant cavity for generating a first and a second fundamental wavelength. A first and a second non-linear region are provided in the second cavity for sum-frequency mixing of the radiation generated in the first cavity and in the second cavity, and for frequency-doubling of the radiation generated in the second cavity, respectively.Type: GrantFiled: December 17, 2004Date of Patent: June 23, 2009Assignee: Cobolt ABInventors: Stefan Spiekermann, Håkan Karlsson, Jenni Nordborg
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Publication number: 20080240177Abstract: 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.Type: ApplicationFiled: April 2, 2007Publication date: October 2, 2008Applicant: COBOLT ABInventors: Hakan Karlsson, Jonas Hellstrom
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Patent number: 7362783Abstract: A method of generating coherent radiation, wherein a first fundamental beam of radiation from a four level laser and a second fundamental beam of radiation from a three level laser are mixed in a non-linear body to obtain an output beam at the sum frequency of the two fundamental beams. The invention also relates to an arrangement for carrying out the method.Type: GrantFiled: June 13, 2002Date of Patent: April 22, 2008Assignee: Cobolt ABInventors: Stefan Spiekermann, Katrin Ekvall, Håkan Karlsson
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Patent number: 7269189Abstract: A method and a device for generating visible coherent radiation is disclosed. The visible coherent radiation is generated by sum-frequency mixing of a first fundamental beam from a diode laser and a second fundamental beam from a diode-pumped solid-state laser. The mixing is performed by means of a quasi-phasematching element provided within the resonant cavity of the solid-state laser. The first fundamental beam is stabilized by providing feedback to the diode laser.Type: GrantFiled: January 21, 2005Date of Patent: September 11, 2007Assignee: Cobolt ABInventors: Sandra Johansson, Stefan Spiekermann, Shunhua Wang, Valdas Pasiskevicius, Fredrik Laurell, Håkan Karlsson, Katrin Ekvall
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Publication number: 20060165136Abstract: A method and a device for generating visible coherent radiation is disclosed. The visible coherent radiation is generated by sum-frequency mixing of a first fundamental beam from a diode laser and a second fundamental beam from a diode-pumped solid-state laser. The mixing is performed by means of a quasi-phasematching element provided within the resonant cavity of the solid-state laser. The first fundamental beam is stabilized by providing feedback to the diode laser.Type: ApplicationFiled: January 21, 2005Publication date: July 27, 2006Applicant: COBOLT ABInventors: Sandra Johansson, Stefan Spiekermann, Shunhua Wang, Valdas Pasiskevicius, Fredrik Laurell, Hakan Karlsson, Katrin Ekvall
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Patent number: 6778563Abstract: A microchip laser arrangement is disclosed. The arrangement is operative to emit Q-switched laser pulses at 1.54 &mgr;m. The lasing medium of the laser arrangement is preferably comprised of Yb:Er-glass, and the Q-switch is comprised of a saturable absorber of cobalt doped spinel crystal. The lasing medium is preferably bonded to the absorber to form a monolithic body, upon the surface of which there are deposited dielectric stacks forming a resonant laser cavity. Pumping of the active medium is performed by means of an InGaAs laser diode emitting light at 0.97 &mgr;m, corresponding well with the absorption of the Yb:Er-glass material.Type: GrantFiled: June 5, 2001Date of Patent: August 17, 2004Assignee: Cobolt ABInventors: Fredrik Laurell, Valdas Pasiskevicius, Boris Ivanovic Galagan, Gunnar Karlsson, Boris Ilich Denker, Sergei Evgenievich Sverchkov
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Patent number: 6754418Abstract: A solid-state laser or arrangement for wavelength conversion is disclosed, which in its simplest embodiment is comprised of a light-generating body arranged in a supporting means, the light-generating body having a shape which is substantially complementary to a guiding structure which is formed in the supporting means. The guiding structure is formed with a high degree of accuracy, for instance, by etching the supporting means or by replicating an original. Between the light-generating body and the guiding structure of the supporting means a thin contact layer is arranged, the purpose of which is to increase the adherence to and/or the heat transfer to the supporting means. Due to the fact that the contact layer is a deformable material, possible discrepancies as regards complementary between the guiding structure and the light-generating body will be filled by the contact layer whereby a close fit is obtained between the complementary structure.Type: GrantFiled: January 28, 2002Date of Patent: June 22, 2004Assignee: Cobolt ABInventors: Johan Holm, Fredrik Laurell, Magnus Olson, Christian Vieider, Henrik Åhlfeldt
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Patent number: 6259711Abstract: The invention refers to a laser having first and second reflecting elements (3, 4) defining a laser cavity; a laser microchip (1) provided in the laser cavity to generate laser radiation of a fundamental wavelength; and a quasi-phase matching non-linear optical element (2) provided in the laser cavity to receive said laser radiation of the fundamental wavelength from the laser microchip (1) and to emit frequency doubled laser radiation (SH) of a wavelength half as long as the fundamental wavelength.Type: GrantFiled: February 24, 1999Date of Patent: July 10, 2001Assignee: Cobolt ABInventor: Fredrik Laurell