WO1988001065A1 - Dispositif d'alignement lateral d'images optiques - Google Patents

Dispositif d'alignement lateral d'images optiques Download PDF

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Publication number
WO1988001065A1
WO1988001065A1 PCT/DE1987/000337 DE8700337W WO8801065A1 WO 1988001065 A1 WO1988001065 A1 WO 1988001065A1 DE 8700337 W DE8700337 W DE 8700337W WO 8801065 A1 WO8801065 A1 WO 8801065A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
imaging system
focal length
optical
imaging
Prior art date
Application number
PCT/DE1987/000337
Other languages
German (de)
English (en)
Inventor
Adolf Triller
Original Assignee
G. Rodenstock Instrumente Gmbh
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 G. Rodenstock Instrumente Gmbh filed Critical G. Rodenstock Instrumente Gmbh
Publication of WO1988001065A1 publication Critical patent/WO1988001065A1/fr

Links

Classifications

    • 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
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4206—Optical features
    • 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
    • G02B6/4225—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements by a direct measurement of the degree of coupling, e.g. the amount of light power coupled to the fibre or the opto-electronic element

Definitions

  • the invention relates to a device for the lateral alignment of an optical image brought about by an imaging system onto a predetermined surface or mark by means of an optical adjustment device.
  • Devices of this type are required, for example, for focusing laser beams onto the entry surface of a light guide.
  • the design of the adjustment device depends on the required accuracy of the adjustment process.
  • the above-mentioned configurations of the adjusting devices are used, for example, in micromanipulators, i.e. in facilities that e.g. allow the setting of a laser beam in ophthalmic treatments.
  • a comparatively rough adjustment accuracy is sufficient here, since the overall accuracy of the system is determined by other processes, for example the smallest eye movements of the person being treated.
  • the entry surface of a light guide can be very small (diameter typically 0.05 mm).
  • the mechanical setting means for the required sensitive and precise relative positioning of the imaging system and light guide are therefore generally complex and expensive.
  • the high outlay for the adjustment process itself and the problems with the long-term stability of the achievable setting accuracy are further disadvantages of the mechanical setting means.
  • optical adjustment devices are used that are similar to a flat plate micrometer.
  • the laser spot is adjusted perpendicular to the optical axis by means of a glass plate which is tilted at a specific point in the beam path of the imaging system.
  • the tilt angle and / or the thickness of the glass plate is varied. Adjustment by means of a glass plate in the two directions perpendicular to the optical axis of the imaging optics therefore requires complicated wobbling movements of the glass plate, so that this optical adjustment device is also difficult to handle. In addition, a glass plate can naturally not be used in a parallel beam path.
  • the invention is based on the object of specifying a device for the lateral alignment of an optical image which, despite its simple design, permits highly precise and at the same time sensitive adjustment.
  • the object is achieved in that the optical adjustment device is a laterally displaceable lens system arranged in front of the imaging system, the focal length of which is greater than the focal length of the imaging system.
  • the optical adjustment device is a laterally displaceable lens system arranged in front of the imaging system, the focal length of which is greater than the focal length of the imaging system.
  • the lateral shift h 2 of the focal point F of the imaging system applies with parallel light entry (e.g. laser beam).
  • the lateral displacement - of the lens L - is thus optically reduced to a certain extent.
  • the lateral position of the system focal point can be adjusted as desired by relatively rough displacement of the lens.
  • Similar laws also apply to the non-parallel beam path in front of the lens L and to a lens system, ie for the series connection of several, coordinated lenses.
  • the device according to the invention thus has a number of advantages:
  • Adjustment of the imaging of an optical imaging system in a plane perpendicular to the optical axis of the imaging system and in particular in the image plane requires only linear movements of the additionally provided lens system in the device according to the invention.
  • the required adjustment movements are therefore considerably simpler to carry out compared to the tilting of a glass plate in known devices of similar adjustment accuracy.
  • the adjustment devices which enable the lens system to be displaced can also be made considerably simpler than in the prior art. Adjustment devices that are easy to manufacture, for example adjusting screws, sliding carriages or the like, can thus be used. Nevertheless, the optical image can be adjusted practically as desired. For this purpose, only the focal lengths of the imaging system and the additional lens system have to be matched to one another in a suitable manner within the claimed frame, so that a specific lateral movement of the lens system corresponds to a specific lateral alignment movement of the image.
  • the focal length of the laterally displaceable lens system is at least a factor of 3, preferably at least a factor 5 larger than the focal length of the imaging system.
  • the greater the focal length ratio the more precisely the adjustment can be carried out and the less sensitive the system becomes to changes in position of the lens system.
  • the distance between the imaging system and the lens system is less than twice the focal length of the imaging system, and preferably the distance is equal to this focal length (claim 3).
  • the device according to the invention is preferably used when laser light is coupled into an optical waveguide (claim 5).
  • the lens system consists of a single lens.
  • a corrected lens it is not absolutely necessary to use a corrected lens. Rather, aberrations can be corrected over the entire optical system. At most with a large aperture ratio and then only with a large distance between the imaging system and the lens system according to the invention, for. B. an achromatic lens system can be used.
  • Fig. 1 shows a cross section through the embodiment, and 2 enlarges an area from FIG. 1,
  • light 1 from a laser is to be coupled into an optical waveguide 2.
  • a lens 3 forming an imaging lens system and a lens 4 are provided in a manner known per se, which lens can be displaced in a plane perpendicular to the optical axis 5 of the lens 3. This is symbolized by the arrow h 1 .
  • the laser is an argon laser with a wavelength of 488 nm.
  • the laser beam 1 typically has a diameter of approximately 2 mm, the entrance surface of the.
  • the optical waveguide has a diameter of 50 micrometers.
  • the imaging lens system 3 is used to focus the laser light on the entrance surface.
  • it is a converging plan-convex lens with the following data:
  • an additional lens system 4 is arranged in front of this imaging lens system 3, which serves to adjust the "focus point" of the laser beam in a plane perpendicular to the optical axis 5 and has a diverging effect arranged at a distance e in front of the lens 3.
  • de Biconcave lens 4 with the following data is:
  • the lateral displacement h of the lens 4 is thus optically reduced to a certain extent.
  • the lateral position of the system focal point F can be set almost exactly as desired by a relatively rough displacement of the lens 4. Similar This also applies to non-parallel beam paths in front of the lens L and to a lens system, ie for the series connection of several, coordinated lenses.
  • the laser beam can therefore be sensitively focused on the entrance surface of the optical waveguide.
  • the lateral shift can take place by mechanical adjustment means.
  • the setting means z. B. can be fixed by a paint lock.
  • the particularly positionally critical imaging lens 3 does not need to be moved during the adjustment process.
  • Adjustment of the imaging of an optical imaging system in a plane perpendicular to the optical axis 5 of the imaging system and in particular in the image plane requires only linear movements of the additionally provided lens system in the device according to the invention.
  • the required adjustment movements are therefore considerably easier to carry out in comparison with the tilting of a glass plate with known devices of similar adjustment accuracy.
  • the adjustment devices which enable the lens system to be displaced can also be made considerably simpler than in the prior art. Adjustment devices that are easy to manufacture, for example adjusting screws, sliding carriages or the like, can thus be used. Nevertheless, the optical image can be adjusted practically as desired.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)

Abstract

Un dispositif d'alignement latéral d'images optiques créées sur une surface ou marque prédéterminée par un système de reproduction d'images utilise un dispositif optique de réglage. Le dispositif optique de réglage se compose d'un système de lentilles (4) latéralement mobile agencé devant le système (3) de reproduction d'images et dont la distance focale est supérieure à la distance focale du système de reproduction d'images (3).
PCT/DE1987/000337 1986-07-30 1987-07-30 Dispositif d'alignement lateral d'images optiques WO1988001065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3625712.5 1986-07-30
DE19863625712 DE3625712C1 (de) 1986-07-30 1986-07-30 Vorrichtung zum lateralen Ausrichten einer optischen Abbildung

Publications (1)

Publication Number Publication Date
WO1988001065A1 true WO1988001065A1 (fr) 1988-02-11

Family

ID=6306270

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1987/000337 WO1988001065A1 (fr) 1986-07-30 1987-07-30 Dispositif d'alignement lateral d'images optiques

Country Status (2)

Country Link
DE (1) DE3625712C1 (fr)
WO (1) WO1988001065A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230348A (en) * 1989-04-08 1990-10-17 Plessey Co Plc Optical coupling through an image surface.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4929045A (en) * 1988-09-29 1990-05-29 Fuller Research Corporation Method and apparatus for aligning optical energy to a wave guide
WO2004097478A1 (fr) * 2003-05-01 2004-11-11 Selex Sensors And Airborne Systems Limited Dispositif de couplage optique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3137602A1 (de) * 1981-09-22 1983-04-07 Teldix Gmbh, 6900 Heidelberg Anordnung zum einkoppeln eines lichtstrahls in eine lichtleitfaser

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551795A (en) * 1982-02-24 1985-11-05 Precision Grinding Limited Apparatus for use in monitoring a plurality of variable parameters

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3137602A1 (de) * 1981-09-22 1983-04-07 Teldix Gmbh, 6900 Heidelberg Anordnung zum einkoppeln eines lichtstrahls in eine lichtleitfaser

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Applied Optics, Band 25, Nr. 15, 1. August 1986, Optical Society of America, (New York, US), K. KAWANO: "Coupling Characteristics of Lens Systems for Laser Diode Modules using Single-Mode Fiber", seiten 2600-2605 siehe figur 1; Zusammenffasung; seite 2603, rechte spalte, zeilen 11-18 *
Proceedings of the IEEE 1985 National Aerospace and Electronics Conference, Dayton Convention Center, 20. -24. Mai 1985, Band 18 IEEE, (US), R.W. UHLHORN: "Imaging Connector Interconnect System for a Parallel Fiber Optic Data Bus", seiten 95-105 siehe figur 2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230348A (en) * 1989-04-08 1990-10-17 Plessey Co Plc Optical coupling through an image surface.

Also Published As

Publication number Publication date
DE3625712C1 (de) 1988-02-18

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