WO2010059892A1 - Ensemble optique comprenant un composant de lentille réglable couplé à une courbure de lentille multidirectionnelle - Google Patents

Ensemble optique comprenant un composant de lentille réglable couplé à une courbure de lentille multidirectionnelle Download PDF

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Publication number
WO2010059892A1
WO2010059892A1 PCT/US2009/065248 US2009065248W WO2010059892A1 WO 2010059892 A1 WO2010059892 A1 WO 2010059892A1 US 2009065248 W US2009065248 W US 2009065248W WO 2010059892 A1 WO2010059892 A1 WO 2010059892A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
motive
flexure
fixed
directional
Prior art date
Application number
PCT/US2009/065248
Other languages
English (en)
Inventor
Steven J Gregorski
Matthew P Hammond
Original Assignee
Corning Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Incorporated filed Critical Corning Incorporated
Publication of WO2010059892A1 publication Critical patent/WO2010059892A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
    • G02B6/4226—Positioning means for moving the elements into alignment, e.g. alignment screws, deformation of the mount

Definitions

  • the present disclosure relates generally to lens systems incorporating one or more lens components that are adjustable in an optical reference frame.
  • Such lens systems enjoy utility in a variety of optical packages including, but not limited to, semiconductor laser optical packages, laser projection systems, and other optical systems where it may be advantageous to provide for the adjustment of an optical component of the system.
  • embodiments of the present disclosure relate generally to optical alignment in packages that include, inter alia, a semiconductor laser and a wavelength conversion device, such as second or third harmonic generation crystal or another type of wavelength conversion device.
  • Embodiments contemplated herein will also find utility in more or less complex optical packages, including those where the adjustable lens component is the only optical component of the package.
  • Short wavelength light sources can be formed by combining a single- wavelength semiconductor laser, such as an infrared or near-infrared distributed feedback (DFB) laser, distributed Bragg reflector (DBR) laser, or Fabry-Perot laser, with a light wavelength conversion device, such as a second harmonic generation (SHG) crystal.
  • the SHG crystal is used to generate higher harmonic waves of the fundamental laser signal.
  • the lasing wavelength is preferably tuned to the spectral center of the wavelength converting SHG crystal and the output of the laser is preferably aligned with the waveguide portion at the input facet of the wavelength converting crystal.
  • Waveguide mode diameters of typical wavelength conversion devices such as MgO- doped periodically poled lithium niobate (PPLN) crystals, can be in the range of a few microns.
  • PPLN periodically poled lithium niobate
  • lens systems are configured for adaptive alignment and can be used in the aforementioned wavelength converted optical packages, or in any optical package where an adjustable lens component may find utility.
  • an optical package comprising a lens system, the lens system comprising an adjustable lens component, a plurality of magnetic elements, and a multi-directional lens flexure.
  • the adjustable lens component is mechanically coupled to a lens mounting portion of the multi-directional lens flexure.
  • the magnetic elements comprise at least one fixed magnetic element and at least one motive magnetic element. The arrangement of the fixed and motive magnetic elements relative to each other forms a first fixed/motive element pair and a second fixed/motive element pair.
  • the motive magnetic element of each fixed/motive element pair is mechanically coupled to a motive portion of the multi-directional lens flexure.
  • the structure of the multi-directional lens flexure and the arrangement of the fixed/motive element pairs is such that non-orthogonal repulsive or attractive magnetic force vectors generated between magnetic elements of the respective fixed/motive element pairs generate movement of the adjustable lens component through orthogonal components x, y along X and Y axes of the X- Y optical reference frame.
  • the multi-directional lens flexure comprises a pair of upstanding portions and a bridge portion.
  • the pair of upstanding portions are spaced from each other along the X-axis of the X-Y optical reference frame and comprise relatively stationary ends secured relative to the X-Y optical reference frame and relatively free ends connected to each other via the bridge portion.
  • the lens mounting portion to which the adjustable lens component is mechanically coupled is located on the bridge portion of the multidirectional lens flexure and the motive portions to which the motive magnetic elements are mechanically coupled are located on the pair of spaced upstanding portions of the of the multidirectional lens flexure.
  • the multi-directional lens flexure comprises a pair of uni-axial flexures and a bridge portion.
  • Each of the uni -axial flexures comprises a relatively stationary end secured relative to the X-Y optical reference frame and a relatively free end.
  • the relatively free ends of the pair of uni-axial flexures are connected to each other via the bridge portion and the lens mounting portion is located on the bridge portion of the multi-directional lens flexure.
  • the multi-directional lens flexure comprises a uni-axial flexure comprising a relatively stationary end secured relative to the X-Y optical reference frame and a relatively free end.
  • the plurality of magnetic elements comprise a common motive magnetic element and a pair of fixed magnetic elements.
  • the common motive magnetic element is coupled to move with the relatively free end of the uni-axial flexure and the pair of fixed magnetic elements share the common motive magnetic element to form the first and second fixed/motive element pairs.
  • FIG. 1 is an isometric illustration of a lens system including a multi-directional lens flexure according to one embodiment of the present disclosure
  • FIGs. 2-5 illustrate the manner in which magnetic elements can be actuated to adjust the lens component of the lens system illustrated in Fig. 1;
  • FIG. 6 is an isometric illustration of a lens system including a multi-directional lens flexure according to another embodiment of the present disclosure
  • FIG. 7 is an isometric illustration of a lens system including a multi-directional lens flexure according to yet another embodiment of the present disclosure
  • FIGs. 8-11 illustrate the manner in which magnetic elements can be actuated to adjust the lens component of the lens system illustrated in Fig. 7;
  • Fig. 12 illustrates a wavelength converting optical package according to one embodiment of the present disclosure.
  • a lens system 100 according to one embodiment of the present disclosure is illustrated in Fig. 1.
  • the lens system 100 comprises an adjustable lens component 10, a plurality of magnetic elements 24, 25, 26, and a multi-directional lens flexure 30.
  • the adjustable lens component 10 is mechanically coupled to a lens mounting portion 32 of the multi-directional lens flexure 30.
  • one of the magnetic elements 25 is a fixed magnetic element that is mechanically coupled to a fixed portion 34 of the multi-directional lens flexure 30 and the remaining magnetic elements 24, 26 are motive magnetic elements that are mechanically coupled to a motive portion 36 of the multi-directional lens flexure 30.
  • the arrangement of the fixed and motive magnetic elements 24, 25, 26 relative to each other forms a first and second fixed/motive element pairs 21, 22.
  • each of the first and second fixed/motive element pairs 21, 22 will comprise a magnetic element that is capable of generating a controllable magnetic field, or a controllable response to a magnetic field.
  • an electromagnetic coil may be provided as the fixed or motive magnetic element of a fixed/motive element pair 21, 22.
  • the structure of the multi-directional lens flexure 30 and the arrangement of the fixed/motive element pairs 21, 22 is such that non-orthogonal repulsive or attractive magnetic force vectors Vp generated between the magnetic elements of the respective fixed/motive element pairs 21, 22 generate movement of the adjustable lens component 10 through orthogonal components x, y along X and Y axes of the X-Y optical reference frame defined by the lens system 100.
  • the multi-directional lens flexure 30 is configured as a spring element defining a resilient spring force that opposes movement of the adjustable lens component through the orthogonal components x, y.
  • each motive magnetic element 24, 26 is mechanically coupled to a different motive portion of the multi-directional lens flexure 30, i.e., the pair of upstanding portions 36 illustrated in Figs. 1-5.
  • the pair of upstanding portions 36 are spaced from each other along the X-axis of the X-Y optical reference frame and comprise relatively stationary ends 36A secured relative to the X-Y optical reference frame and relatively free ends 36B connected to each other via a bridge portion 38 of the flexure 30.
  • the lens mounting portion 32 of the flexure 30 is located on the bridge portion 38 of the multi-directional lens flexure 30. Referring to Fig.
  • the multi-directional lens flexure 30 is formed from a relatively flexible material, attractive magnetic force vectors Vp generated between the magnetic elements of the respective fixed/motive element pairs 21, 22 attracts the upstanding portions 36 of the multidirectional lens flexure 30 towards each other along the X-axis of the X-Y optical reference frame.
  • This motion elevates the lens mounting portion 32 of the multi-directional lens flexure 30, and the adjustable lens 10 mounted thereto, along the Y-axis of the X-Y optical reference frame and can be controlled, for example, by using electromagnetic coils and suitable electronic control circuitry as the motive magnetic elements 24, 26.
  • the multi-directional lens flexure 30 can be formed from a relatively flexible material to define an overall spring-like construction that permits the various deformations described herein and is inclined to return to a resting zero-force configuration.
  • Materials suitable for construction of the flexure include, but are not limited to flexible plastics, relatively thin metal shims, or flexible plastic/metal laminate structures, such as those found in flexible circuit interconnects.
  • the concept of using a flexible plastic/metal laminate structure including electrical circuit interconnects is particularly advantageous in practicing the embodiments disclosed herein because such a configuration would simultaneously provide the mechanical flexure for adjusting the position of the adjustable lens 10 and the electrical interconnections for driving the respective fixed/motive element pairs 21, 22.
  • FIGs. 4 and 5 illustrate the manner in which attractive and repulsive magnetic force vectors V F can be combined to generate motion along the X— axis of the X-Y optical reference frame.
  • two different combinations of repulsive and attractive magnetic force vectors Vp generated between magnetic elements of the respective fixed/motive element pairs causes the upstanding portions 36 of the multi-directional lens flexure 30 to flex in a common direction along the X-axis of the X-Y optical reference frame, shifting a position of the lens mounting portion 32 of the multi-directional lens flexure 30, and the adjustable lens mounted thereto, along the X-axis.
  • Hybrid combinations of the repulsive and attractive force vectors V F illustrated in Figs 2-5 can be used to shift the position of the adjustable lens 10 along the X and Y axes of the X-Y optical reference frame.
  • a lens system 110 incorporating a multi-directional lens flexure 130 is illustrated in Fig. 6 and comprises a pair of uniaxial flexures 132, 134 and a bridge portion 136 to which the adjustable lens component 10 is mechanically coupled.
  • the lens system 110 also includes a relatively stationary lens component 15.
  • Each of the uni-axial flexures 132, 134 comprises a relatively stationary end 132 A, 134A, that is secured relative to the X-Y optical reference frame, and a relatively free end 132B, 134B.
  • the free ends 132B, 134B are connected to each other via the bridge portion 136.
  • the multidirectional lens flexure 130 may be formed from a variety of resilient but flexible materials and is configured as a spring element defining a resilient spring force that opposes movement of the adjustable lens component through the orthogonal components x, y.
  • two of the magnetic elements 124, 125 are fixed magnetic elements that are mechanically coupled to a fixed portion 135 of the multidirectional lens flexure 130 via a rigid base portion 140.
  • the remaining two magnetic elements 126, 127 are motive magnetic elements that are mechanically coupled to the free ends 132B, 134B of the multi-directional lens flexure 130.
  • the arrangement of the fixed and motive magnetic elements 124, 125, 126, 127 relative to each other forms first and second fixed/motive element pairs 121, 122.
  • each of the first and second fixed/motive element pairs 121, 122 will comprise a magnetic element that is capable of generating a controllable magnetic field, or a controllable response to a magnetic field.
  • the structure of the multi-directional lens flexure 130 and the arrangement of the fixed/motive element pairs 121, 122 of Fig. 6 is such that repulsive magnetic force vectors V F generated between magnetic elements of the respective fixed/motive element pairs 121, 122 elevates the adjustable lens 10 along the Y-axis of the X-Y optical reference frame.
  • attractive magnetic force vectors V F generated between magnetic elements of the respective fixed/motive element pairs 121, 122 lowers the adjustable lens 10 along the Y-axis of the X-Y optical reference frame.
  • FIGS. 10 and 11 illustrate the manner in which different combinations of repulsive and attractive magnetic force vectors V F can be used to shift the adjustable lens along an arced adjustment path having components along the X and Y axes of the optical reference frame.
  • hybrid combinations of the repulsive and attractive force vectors V F illustrated in Figs 8-11 can be used to shift the position of the adjustable lens 10 to a variety of positions in the X-Y optical reference frame.
  • the lens system 120 of Fig. 7 is similar in many respects to the embodiment illustrated in Fig. 6 of the present disclosure, with the exception that the multi-directional lens flexure takes the form of a single uni-axial flexure 232 comprising a relatively stationary end 232 A secured relative to the X-Y optical reference frame and a relatively free end 232B to which the adjustable lens 10 is mounted.
  • the set of magnetic elements comprise a common motive magnetic element 224 and a pair of fixed magnetic elements 225, 226 arranged such that the fixed magnetic elements 225, 226 share the common motive magnetic element 224 to form the first and second fixed/motive element pairs 221, 222.
  • the common motive magnetic element 224 is coupled to move with the relatively free end 232B of the uni-axial flexure 232.
  • repulsive and attractive magnetic force vectors V F generated between the magnetic elements of the respective fixed/motive element pairs 221, 222 elevate and lower the adjustable lens 10 along the Y-axis of the X-Y optical reference frame.
  • Different combinations of repulsive and attractive magnetic force vectors V F can be used to shift the adjustable lens 10 to a variety of positions in the X-Y optical reference frame.
  • the flexure 232 may be formed from a variety of resilient but flexible materials and is configured as a flexible rod that defines a resilient spring force that opposes movement of the adjustable lens component through the orthogonal components x, y.
  • the optical package illustrated schematically in Fig. 12 illustrates the utility of providing for optical adjustment in the context of a frequency-doubled optical package comprising a semiconductor laser 5, a wavelength conversion device 20, and a lens system that is configured to optically couple an output beam of the semiconductor laser 5 into a waveguide portion of a wavelength conversion device 20.
  • the lens system comprises an adjustable lens component 10 and a stationary lens component 15.
  • the adjustable lens component 10 is adjustable in one or more degrees of freedom relative to an X-Y optical reference frame. The movement of the adjustable lens component 10 adjusts the position of the output beam on the input facet of the wavelength conversion device 20 to optimize the output of the wavelength conversion device 20.
  • Optical packages of this nature can also include a beam splitter 40, an optical intensity monitor 50, and a programmable controller 60 to provide a feedback mechanism for controlling the adjustable optical component 10 as a function of output intensity.
  • Lens systems according to the present disclosure can find utility in more or less complex optical packages, including those where the adjustable lens component is the only optical component of the package.
  • a "magnetic element” is any structure that comprises a material upon which an attractive or repulsive force can be generated due to the presence of a magnetic field, including but not limited to a permanent magnet, a structure, like an electromagnetic coil, that comprises a permanent magnet, a metal that responds to a magnetic field, a structure that comprises a metal that responds to a magnetic field, or combinations thereof.
  • variable being a "function" of a parameter or another variable is not intended to denote that the variable is exclusively a function of the listed parameter or variable. Rather, reference herein to a variable that is a "function" of a listed parameter is intended to be open ended such that the variable may be a function of a single parameter or a plurality of parameters.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Lens Barrels (AREA)

Abstract

L'invention porte sur un ensemble optique qui comprend un système de lentille, le système de lentille comprenant un composant de lentille réglable, une pluralité d'éléments magnétiques et une courbure de lentille multidirectionnelle. Le composant de lentille réglable est couplé mécaniquement à une partie de montage de lentille de la courbure de lentille multidirectionnelle. Les éléments magnétiques comprennent au moins un élément magnétique fixe et au moins un élément magnétique mobile. La disposition des éléments magnétiques fixe et mobile l'un par rapport à l'autre forme une première paire d'éléments fixe/mobile et une seconde paire d'éléments fixe/mobile. L'élément magnétique mobile de chaque paire d'éléments fixe/mobile est couplé mécaniquement à une partie mobile de la courbure de lentille multidirectionnelle. La structure de la courbure de lentille multidirectionnelle et la disposition des paires d'éléments fixe/mobile sont telles que les vecteurs de force magnétique répulsive ou attractive non orthogonaux générés entre des éléments magnétiques des paires respectives d'éléments fixe/mobile génèrent un mouvement du composant de lentille réglable suivant des composantes orthogonales x, y le long des axes X et Y du cadre de référence optique X-Y.
PCT/US2009/065248 2008-11-24 2009-11-20 Ensemble optique comprenant un composant de lentille réglable couplé à une courbure de lentille multidirectionnelle WO2010059892A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/276,509 US7898752B2 (en) 2008-11-24 2008-11-24 Optical package comprising an adjustable lens component coupled to a multi-directional lens flexure
US12/276,509 2008-11-24

Publications (1)

Publication Number Publication Date
WO2010059892A1 true WO2010059892A1 (fr) 2010-05-27

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TW (1) TW201037386A (fr)
WO (1) WO2010059892A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8139216B2 (en) * 2009-11-20 2012-03-20 Corning Incorporated Optical package alignment systems and protocols

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Publication number Priority date Publication date Assignee Title
WO1991006022A1 (fr) * 1989-10-13 1991-05-02 Bt&D Technologies Limited Montage d'elements optiques
JPH06295445A (ja) * 1993-04-07 1994-10-21 Sharp Corp 対物レンズ傾き調節装置
US5768037A (en) * 1995-10-06 1998-06-16 Eastman Kodak Company Actuator with single surface-field motor
EP1004910A2 (fr) * 1998-11-23 2000-05-31 Lucent Technologies Inc. Système de brassage optique comportant des éléments reconfigurable réfléchissant la lumière
US20040217092A1 (en) * 2002-02-28 2004-11-04 Demers Joseph R. Sub-micron adjustable mount for supporting a component and method
WO2006137853A2 (fr) * 2004-09-16 2006-12-28 Sony Electronics Inc. Mecanisme de lentille mobile

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TW201037386A (en) 2010-10-16
US7898752B2 (en) 2011-03-01
US20100128369A1 (en) 2010-05-27

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