WO2002101437A2

WO2002101437A2 - Arrangement and device for transforming optical rays

Info

Publication number: WO2002101437A2
Application number: PCT/EP2002/004087
Authority: WO
Inventors: Vladimir Davydenko
Original assignee: Hentze-Lissotschenko Patentverwaltungs Gmbh & Co.Kg
Priority date: 2001-06-12
Filing date: 2002-04-12
Publication date: 2002-12-19
Also published as: WO2002101437A3; DE10128470A1

Abstract

The invention relates to a device for transforming optical rays with at least one entry surface (13) and at least one exit surface (14), through which a light beam (9) to be transformed can pass. Said device for transforming optical rays consists of a double-refracting material. At least one optical axis thereof is positioned in such a way in relation to the entry surface (13) and the exit surface (14) of the device so as to cause the light beam (9) passing through the device (3) to be reflected inside the device (3). The cross-section (10) of the light beam (9) entering the device (3) for transforming optical rays is thus transformed into a section (10'), which, in relation to the cross-section (10) of the incident light beam, seems to be mirrored on a parallel plane (S) of the light beams (9) which impact upon the device (3) in the direction of propagation. The invention also relates to an arrangement comprising a device (3) for transforming optical rays, by means of which a light beam (9) emerging from a laser diode can be projected onto an optical fibre.

Description

"Arrangement and device for optical beam transformation"

The present invention relates to an arrangement for optical beam transformation, which can be used to image a light source or a plurality of light sources on the end face of an optical fiber, comprising at least one light source which can emit at least one light beam, and furthermore comprising a fast-axis collimation lens and at least one Device for optical beam transformation, wherein the at least one light beam that has passed through the fast-axis collimation lens can strike the at least one device for optical beam transformation, and wherein the at least one light beam can at least partially pass through it. The invention further relates to a device for optical beam transformation for use in an arrangement of the aforementioned type.

A device and an arrangement of the aforementioned type are known, for example, from German published patent application DE 199 20 293 AI. In the arrangement described therein, the light emanating from a laser diode bar is to be imaged on a light guide or the like by means of various fast-axis and slow-axis collimation lenses. In this arrangement there is an optical device

Beam transformation built in, which rotates the beam cross-section by 90 °, so that the divergence of the fast axis is swapped with the divergence of the slow axis. As a result of this exchange, the light emanating from the individual emission sources of the laser diode bar arranged next to one another can be collimated more easily, in particular after passing through the device for optical beam transformation.

In the aforementioned device from the prior art, an array of beam rotating elements is formed as an essentially cuboid-shaped transparent block, with opposite entrance and exit surfaces are each formed cylindrical lens segments, the cylinder axes of which form an angle of approximately 45 ° with the direction in which the individual emission sections of the laser diode bar lie next to one another. The aforementioned rotation of the beam cross section can be achieved by these cylindrical lens sections arranged at an angle of 45 ° on the entry and exit surfaces. It proves to be disadvantageous here that such cylindrical lens sections require a considerable amount of production.

The problem on which the present invention is based is the creation of an arrangement and a device of the type mentioned at the outset which are of simpler construction and can be manufactured more cost-effectively.

This is achieved according to the invention with regard to the arrangement by the characterizing features of claim 1 and with regard to the device by the characterizing features of claim 3.

It is envisaged that the device for optical beam transformation consists of a birefringent material, the at least one optical axis of which is oriented relative to the entry surface and the exit surface of the device such that the at least one light beam passing through the device experiences a reflection inside the device , so that the cross section of the at least one light beam entering the device for optical beam transformation is converted into a cross section which is opposite to the cross section of the incoming light beam

Direction of propagation of the at least one light beam parallel plane impinging on the device appears mirrored. Such a device can have the effect that the light formed, for example, by a laser diode bar as it passes through the device ts Q LQ P ⁾ P Ξ P SU <s;<1 Φ SU «<s; 3 i CQ FQ rt ü φ Φ p φ Φ PP μ- Φ φ μ- P uo P Φ φ P Φ μ- μ-

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Further advantages and features of the present invention will become clear from the following description of preferred exemplary embodiments with reference to the accompanying figures. Show

La shows a plan view of an arrangement according to the invention for optical beam transformation;

FIG. 1b shows a side view of the arrangement according to FIG.

Fig. 2a is a side view of an inventive

Optical beam transformation device;

Fig. 2b is a view according to the arrow Ilb in Fig. 2a;

Fig. 2c is a sectional view according to IIc-IIc in Fig. 2a;

3 shows a schematic view of a beam transformation with the device according to FIG. 2.

The arrangement for optical beam transformation shown in FIG. 1 comprises a light source 1 designed as a laser diode bar, which represents an essentially linear light source. Instead of a linear light source, a point light source or a light source consisting of groups of point sources or a flat light source with any angular distribution can also be used. Coordinate axes x, y, z are drawn in FIGS. 1 a and 1b for better orientation. The light source 1 extends, for example, essentially in the x-direction, in which it extends, for example, by 10 mm. In contrast, the extension of the light source 1 in the y direction is approximately one micrometer. The light emitted by the light source 1 has a significantly greater divergence in the direction of the y axis than in the direction of the x axis. The divergence in the y direction is approximately 0.5 rad, whereas the divergence in the x direction is approximately 0.1 rad. Farther the light source 1 designed as a laser diode bar has a plurality of emitting sections in the x-direction, for example 20-25 sections in its longitudinal direction.

The at least one light beam 9 emanating from the light source 1 is collimated in a cylindrical lens serving as a fast-axis collimation lens 2, which extends essentially in the x direction, such that the divergence in the y direction is only 0.005 rad, for example , so that the light behind the cylindrical lens is essentially parallel with respect to the y-axis.

In the device 3 for optical beam transformation to be described in more detail below, the cross section 10 of the incident light beam 9 is reflected on a surface which is essentially parallel to its direction of propagation, so that after exiting the device 3 the divergence in the y direction is approximately 0. 1 rad and the divergence in the x direction is approximately 0.005 rad. Such a light beam, which is only slightly divergent in the x direction and moderately divergent in the y direction, can be easily focused and coupled onto the end of an optical fiber 7 by the focusing elements 4, 5, 6, for example designed as cylindrical lenses.

2 shows an embodiment of a device 3 according to the invention for optical beam transformation. The device 3 is an essentially cuboid block made of a birefringent material, such as calcite, Ti0 ₂ or YV0 ₄ . This block of birefringent material is subdivided in the x-direction into juxtaposed, identical beam rotating elements 8. Each of these jet rotating elements 8 has an entry surface 13 and an exit surface 14, which are essentially opposite one another in the z direction and each extend in an xz plane.

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P P 0 TS P P rt μ- rt Ω Hi P rt P rt pr Φ P P <Hi Φ Hi P LQ μ- Φ CQ tr

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SU N φ pr SU μ- tr Φ μ- fu P P tr P rt P CQ P P fu = rt Φ P i LΠ P D μ-

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P μ- Z μ- Ω O rt - Φ rt rt μ- pr pr P Ω pr 1 Ω Φ μ- Φ Ω tr CD μ- pr

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Φ LQ »P pr pr tr Φ μ] P 0 μ- fu Oi Φ P P CD Φ μ- P Φ rt CQ LQ μ- P

LΠ CQ fi 3 Ω P CD P LQ CQ Ω P i P Ω pr Φ P P LO rt P 0 φ P. φ P P rt

Φ 0 - Φ μ- φ Φ φ pr Φ SU pr CQ LQ ^ P fi P Ω i P 0 = fi Φ

P CQ P rt ω P tr SU P o. P Ω rt CQ i μ- SU Φ CQ pr Φ Λ P P

CQ N rt fi o. Rt CQ μ- PC ^Q o. Φ pr o. Μ- P LQ pr P Hi rt P si Φ P rt P SU fu Φ Ω Hi μ- μ- 3 LQ μ- P 3 P CQ μ - P LQ Φ

P P rt CD Si <l CQ pr ü Ω φ> Q P Ω φ SU: P CD μ-

Φ rt CD SU φ P φ Si pr td φ P rt Ω pr to P α Ω P pr μ- LQ P

Ω X LQ CQ P μ> μ- rt μ- rr μ- μ- CD pr ⁾ μ- pr P φ CQ Φ Φ pr 1 Φ Φ CQ CQ o rt. Φ P Ω rt μ- Oi tr φ φ fi X- ¹ rt 3 3 rt Mi μ- φ rt μ- rt tr PP Oi μ- P Φ P PJ =

P P fi pr> Ω P Φ μ- μ- φ SU z SU 0 P Ä

P φ μ- φ o. P pr μ- P rt ^ φ Ω φ P μ> tr P

H fi φ P Φ Hl • rt ^ rt μ- pr LQ μ> Φ o.

P Φ CQ rt LQ Φ ** PPP

Hi CQ QS! <! o- ^ ^• TO α φ α z tr Di CD PJ>CQ> ö P ¹ ö <! CQ Z <_ι. tr pr rt rt μ- 0 φ 0 μ- P μ- 0 Φ Φ rt P tr PP μ- μ- Φ φ rt Φ Φ ** μ-

P P P P P P LQ φ rt <tr P 3 SU Mi CD CD P Ω <P P P LQ z P

Ω fu u pr NP φ CQ φ μ- LQ P LQ Ω z o. Ω pr φ rt fi fu LQ φ Ω fi pr pr pr φ P ≥ φ LQ S5 ö PPP α pr P pr μ- φ pr rt PP> Φ pr Φ μ- P rt J_J P tr pr φ φ P LQ LQ PP φ PPP pr CQ LQ PPP

Φ CD D CQ φ rt P μ- μ- Φ φ LQ PPP μ- Si P fi rt φ CQ rt φ i Q o. Ω rt pr φ PP = LQ Ω P LQ CQ Ω fi rt P μ- PP Ω x- > P CQ pr

SU u T3 3 P P tr P pr N φ tr pr σ rt <P Φ PJ tsi pr μ- LQ CQ Oi tr rt

P P φ pr Φ Φ P rt P Φ LQ μ- i Φ Φ Q pr P Ω Su = Φ μ- Φ P

Hi Hi LQ P P P P LQ. μ- LQ su <! φ P P o. P pr P P φ tsi Φ φ. P P o. P P Φ P pr μ- φ CQ Φ LQ φ LQ μ- rt ü Si z LQ o. O. O. Μ- Φ LQ P o. Μ- P P CQ P Φ Z o. Φ Φ

Φ Φ SU = si φ φ Φ X Φ P LQ <Φ P rt ⁽ O fi P fu pr P

P P pr Φ μ- P P P 1 N Si Φ 0 P o. ^ Fu Oi Φ CD P <i P o.

P μ- P to ö rt PPP Φ 1 P <PP o. 0 o. 0 P Φ td rt N to μ- μ- Φ PNP ¹ P to CQ 0 P su z φ P LQ P

P μ- φ Φ X P 1 Φ Ω <i Ω o. Μ- rt μ- Ω P Ω CQ CQ μ-. CQ CQ

CQ P μ- P 1 CQ t Hi tr Φ to tr μ- φ Ω - Ω pr LQ pr M CD Φ rt Z td rt rt CQ pr P μ- rt P Φ P P pr pr P Φ 0 ö Φ φ - Ω

PP rt μ- tr μ- Ω φ P LQ CQ o. Rt i rt PP 0, z 0. φ P Φ Ω pr pr o. Μ- tr μ- pr μ- μ- P Φ rt μ- X <Λ su P LQ 0 μ- 1 P μ- Φ Φ CQ CQ rt rt rt N tr rt rt LQ P o. Φ 1 0 P CQ P 3 φ sr P Φ P φ rt rt rt pr μ- rt P μ- N μ- to P Φ CQ LQ Si 3 Ω μ- fi P

CD D Z su φ P P 0 <i μ- P φ φ <μ- pr CQ P φ su fu

Hi Hi φ PP; P LQ P 0 μ- Φ 0 Ω μ- tr <! PP 0 CQ Ω •> er μ- ¹ x-> PPP LQ CQ PPPP tr Ω φ φ Φ P 1 o. Pr Td μ> H ¹ su = PJ = i P pr Mi LQ P rt pr μ- PZP α μ- φ μ- o Φ

Ω Ω Φ o. LQ o. Fu tr ^■ ; φ μ- P rt CQ 3 P μ- μ- μ- φ 3 LQ tr P tr pr PP CD Φ P fu = Φ 1 P Ω PP »P μ- CQ P Ω <SU N φ φ P z PP Ω μ- to N pr LQ P pr μ- rt i pr φ rt P * • rt

Ω φ pr CQ μ- rt LQ φ Φ rt φ rt P rt μ- t P Φ μ- 3 o. Pr μ- 0 Si Φ O Ω μ- P Φ P Φ tr P LQ P cα tr Ω μ-

P μ- SU CQ TS SU P μ- pr PP μ- LO <! CD PP Φ ⁾ Ω tr ~ rt CQ Φ φ rt N φ rt LQ PO 5! CD P LQ P pr pr P Φ ~ Z

N CD P μ- P μ ¹ H ¹ PX fu PP Φ PN φ P CQ Φ

1 o. Et μ- CQ μ> CQ P 1 ω PP LQ μ- o. LQ LO rt o. CQ ü μ- to Φ o. CQ P Ω <z LQ to Si rt Φ D Φ PP = φ CQ μ- 3 Φ T3 pr φ P φ μ- P Φ Φ pr Φ P μ- pr P SU tr TP φ

Ω P P * <; Φ P 3 μ- o. Ω PPP Φ P μ- o. P Φ μ- φ <i pr Φ 1 P z CQ Φ pr PP SU CQ P CD P LQ P Φ 3 rt P Ω to φ φ φ P rt P = g o. P rt X oo Hl CD <P μ-

P CQ P pr μ- P μ- P P tr 3 Φ CQ P 1 P φ 0 μ- q = CQ rt

P rt Ml Φ Ω Ω fi P φ P P 0 φ CD SU t P P P Ω to tr Φ

CQ P rt P pr pr φ φ rt P LQ Ω P rt H3 Φ pr μ- Ω 3 pr Ω Φ pr μ- o.

P o. Rt CQ rt P Z CQ pr PJ = Φ μ- Ω pr Td Su rt P φ Φ μ- rt Φ Φ P Φ fu> ü <SU P μ- P rt pr rt fu rt Φ CQ P P

3 rt Hl P 3 pr P 0 φ Ό O- N P rt P CQ μ- μ- μ- μ-

CQ Hi Si CQ pr Φ o P = P μ- • P Φ CQ φ SU P Φ rt 0 P P Ω cd

Z "P i SU μ- P φ - P pr P φ P rt P P rt 1 P LQ pr Z P φ P P pr P Oi μ- μ> LQ SU φ P P P CQ LQ Φ sr • ri φ rt 0 Ω

CQ P P - CQ φ P P P u Φ Hi P CQ μ- N pr

Φ PT pr μ- P φ P μ- fi Φ pr P 0 P o. Μ- m LQ Φ μ- pr CD

P rt rt fi Ω - _" P SU Ω Φ Si PP Φ CQ μ- Ω μ- rt rt Φ pr fi pr P 1 P> φ 3 o- P 1 Φ Ω pr φ fu oo CD rt P SI φ rt P SU μ- ω tr pr P tr μ- Φ Φ 3 μ- P μ- P μ- rt Oi PP φ tr Φ

Ω CQ D μ- P Q SU <μ- φ φ φ μ- Φ P pr Ω pr rt Ω 0 P rt rt μ- φ pr Φ pr P Φ SU

P P -

Claims

Claims:

1. An arrangement for optical beam transformation, which can be used to image a light source (1) or a plurality of light sources on the end face of an optical fiber (7), comprising at least one light source (1) that can emit at least one light beam (9), and also comprising a fast-axis collimation lens (2) and at least one device (3) for optical beam transformation, wherein the at least one light beam that has passed through the fast-axis collimation lens (2) can strike the at least one device for optical beam transformation, and wherein the at least one a light beam (9) can at least partially pass through it, characterized in that the device (3) for optical beam transformation consists of a birefringent material, the at least one optical axis of which is opposite the entry surface (13) and the exit surface (14) of the device (3) is oriented that the device (3 ) passing through at least one light beam (9) inside the device

(3) experiences a reflection, so that the cross-section (10) of the at least one light beam entering the device (3) for optical beam transformation is converted into a cross-section (10 ') which is compared to the cross-section (10) of the incoming light beam (9 ) appears mirrored on a plane (S) parallel to the direction of propagation (z) of the at least one light beam (9) incident on the device (3).

2. Arrangement according to claim 1, characterized in that the light source (1) is designed as a laser diode bar and that by the device (3) for optical beam transformation effected beam transformation (ST) the divergence of the fast axis and the slow axis of the at least one light beam passing through the device (3) is exchanged.

3. Device for optical beam transformation for use in an arrangement according to one of claims 1 or 2 with at least one entry surface (13) and at least one exit surface (14) through which a light beam (9) to be transformed can pass, characterized in that the Device (3) for optical beam transformation consists of a birefringent material, the at least one optical axis of which is oriented relative to the entry surface (13) and the exit surface (14) of the device (3) such that a light beam (3) passing through the device (3) 9) undergoes a reflection inside the device (3), so that the cross section (10) of the light beam entering the device (3) for optical beam transformation is converted into a cross section (10 ') which is compared to the cross section (10) of the entering light beam (9) on a to the direction of propagation (z) of the light incident on the device (3) tstrahls (9) parallel plane (S) appears mirrored.

4. The device according to claim 3, characterized in that an optically uniaxial material, in particular calcite, Ti0 ₂ or YV0 _{4 is} used as the birefringent material for the device (3).

5. Device according to one of claims 3 or 4, characterized in that the inlet surface (13) and the outlet surface (14) are opposite one another and are preferably arranged approximately parallel to one another.

6. Device according to one of claims 3 to 5, characterized in that the device (3) has a plurality of beam rotating elements (8) arranged next to one another, through each of which a light beam (9) can pass through and be transformed accordingly with regard to its cross section (10, 10 ').

7. The device according to claim 6, characterized in that the inner reflection surfaces (11) extend substantially in the direction (z) of the normal to the entry surface (13), the reflection surfaces (11) at an angle (α) with respect to the direction (x) are inclined, in which the individual jet rotating elements (8) are arranged side by side.

8. The device according to claim 7, characterized in that the angle (α) at which the reflecting surfaces are inclined relative to the arrangement direction of the individual beam rotating elements (8) is approximately 30 ° to 60 °, preferably approximately 45 °.

9. Device according to one of claims 7 or 8, characterized in that the inner reflection surfaces (11) with the direction (z) of the normal on the entry surface

(13) Include a small angle (J3) of approximately 3 °.

10. The device according to one of claims 3 to 9, characterized in that the at least one inner reflection surface (11) is formed by a side of the device arranged between the inlet surface (13) and the outlet surface (14)

(3) at least one incision is provided in the body of the device (3), one of the surfaces of this incision serving as a reflection surface (11).

11. Device according to one of claims 3 to 10, characterized in that a light beam (9) passing through the device can be substantially totally reflected on the at least one reflection surface (11).

12. Device according to one of claims 3 to 11, characterized in that an essentially perpendicular light beam (9) incident on the entry surface (13) when passing through this entry surface (13) at an angle of approximately 15 ° to 60 °, is deflected in particular at an angle of 25 ° to 45 ° with respect to its entry direction (z).

13. Device according to one of claims 3 to 12, characterized in that the point of incidence of a light beam

(9) on the entry surface (13) and the exit point of the light beam (9) on the exit surface (14) essentially in the direction (z) in which the light beam (9) impinges on the entry surface can be aligned.