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WO1992003859A1 - Agencement de reflecteurs pour la chambre de pompage d'un laser - Google Patents

Agencement de reflecteurs pour la chambre de pompage d'un laser Download PDF

Info

Publication number
WO1992003859A1
WO1992003859A1 PCT/DE1991/000643 DE9100643W WO9203859A1 WO 1992003859 A1 WO1992003859 A1 WO 1992003859A1 DE 9100643 W DE9100643 W DE 9100643W WO 9203859 A1 WO9203859 A1 WO 9203859A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser
pump light
active medium
light source
ellipse
Prior art date
Application number
PCT/DE1991/000643
Other languages
German (de)
English (en)
Inventor
Reinhold Dinger
Ludwig Ulbrich
Original Assignee
Rofin Sinar Laser 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 Rofin Sinar Laser Gmbh filed Critical Rofin Sinar Laser Gmbh
Publication of WO1992003859A1 publication Critical patent/WO1992003859A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
    • H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp
    • H01S3/093—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
    • H01S3/0931—Imaging pump cavity, e.g. elliptical

Definitions

  • Reflector arrangement for the pumping chamber of a laser
  • the invention relates to a reflector arrangement for the pumping chamber of a laser, in particular for the pumping chamber of a solid-state laser, according to the preamble of the main claim.
  • a reflector arrangement for the pumping chamber of a solid-state laser with two pumping light sources is known, the surface contour of which is composed of two ellipses of the same eccentricity in a sectional plane perpendicular to the optical axis of the laser-active medium.
  • Each pump light source arranged parallel to the optical axis is assigned an ellipse section, which is formed from one of these ellipses, for focusing the pump light onto the laser-active medium.
  • the two ellipses have a focal point in common.
  • the focal point is the laser-active medium.
  • the invention is based on the object of specifying a reflector arrangement for the pumping chamber of a laser, in particular for the pumping chamber of a solid-state laser with two pumping light sources, the efficiency of which is increased compared to the reflector arrangement known from the prior art.
  • a reflector arrangement is provided in a solid-state laser with a laser-active medium extended in the direction of its optical axis and at least two pumping light sources arranged parallel thereto, which arrangement is used to focus the pumping light sources on the laser-active medium has a plurality of surface contours containing ellipse sections, the surface contour for focusing each pumping light source containing a plurality of ellipse sections which are formed from two confocal ellipses of different eccentricity. Since several ellipse sections are provided for focusing each pump light source, which are formed from two confocal ellipses of different eccentricity, the proportion of the pump light focused directly on the laser-active medium by a pump light source can be increased almost to 100%.
  • an ellipse section belonging to another pump light source is arranged between the confocal ellipse sections of different eccentricity assigned to a pump light source.
  • FIG. 1 schematically illustrates a reflector arrangement with two pump light sources according to the prior art in a sectional image.
  • a reflector arrangement according to the invention is shown in more detail in FIG.
  • a pump chamber with two pump light sources 4 and 6 and a laser-active medium 2 extended along the optical axis contains a reflector arrangement according to the prior art, the surface contour 11 of which extends in a direction perpendicular to the optical axis of the laser-active medium 2 and parallel to the plane of the drawing Section plane is composed of two Ellipsenab ⁇ sections 14 and 15.
  • the surface contour 11 is mirror-symmetrical to a plane containing the optical axis and perpendicular to the connecting straight line 24 of the two pumping light sources 4 and 6, which intersects the plane of the drawing in the straight line 24.
  • the ellipse section 14 is formed by an ellipse, one focus B of which lies within the pump light source 6 and the other focus M of which lies within the laser-active medium 2.
  • the ellipse section 15 is formed by an ellipse, the foci A and M of which are located within the pump light source 4 or the laser-active medium 2.
  • the figure shows that the pump light emitted by the pump light source 6 at an angle, for example, strikes the ellipse section 15 and is therefore not directly reflected in the laser-active medium 2.
  • the geometric efficiency is thus 2 x / 360 ⁇ lower than the efficiency of a simple ellipse arrangement.
  • This loss is caused by a finite distance a between the surface of the laser-active medium 2 and the surface of the reflector with the surface contour 11, which usually coincides with the inner surface of the pump chamber.
  • the distance a is required to allow a cooling medium to flow around the laser-active medium 2.
  • a surface contour 12 of the reflector is provided, which is composed of a total of at least six ellipse sections 13, 14, 15 and 16. These ellipse sections 13, 14, 15 and 16 are formed from four ellipses, two of which are confocal.
  • the ellipse sections 14 and 16 or 13 and 15 formed from the confocal ellipses are each intended for focusing a pump light source 6 or 4.
  • a laser-active medium 2 for example an Nd-YAG solid, is also provided in the form of a hollow rod, in the interior of which a further pump light source 8 can be arranged.
  • the parameters a. and b. are the major and minor semiaxes of these ellipses.
  • Equation (1) has a greater eccentricity than the ellipses according to equation (2), ie c / a * applies. c / a 2 -
  • the straight line 21 through A and S intersects the straight line 24 at the point P.
  • the points B and P define a further straight line 22 which intersects the ellipse section 14 at the point R.
  • Point R also lies on a tangent from A to laser-active medium 2.
  • the pump light emitted at an angle by the pump light source 6 must now be focused on the laser-active medium 2 on a suitable reflector surface. This is achieved by placing an ellipse section 16 of an ellipse in the angular range between points S and P, the foci of which are formed by M and B.
  • the points S and P are for a given initial shape of the ellipse sections 14 and 15 the semiaxes a 2 and b 2 of the ellipse belonging to the ellipse section 16 are fixed.
  • Circular sections 18 and 17 are then provided around the pump light sources 4 and 6 instead of elliptical sections.
  • Both the laser-active medium 2 and the pump light sources 4 and 6 can also be surrounded by flow tubes. These flow tubes can e.g. be provided in order to reduce the absorption of pump light in water, to filter UV components or to supply wavelength ranges adapted to the pump bands. Both rods and tubes can be used as laser-active media 2.
  • the reflector arrangement according to the invention is not limited to certain laser-active media.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

Pour l'augmentation du rendement géométrique lors de la focalisation d'au moins deux sources de lumière de pompage (4, 6) sur un milieu actif (2) d'un laser, en particulier d'un laser solide, il est prévu un agencement de réflecteurs (10) dont le contour superficiel (12) contient, pour la focalisation de chaque source de lumière de pompage (4, 6) sur le milieu actif (2), plusieurs sections elliptiques (14, 15) constituées de deux ellipses à foyer commun d'excentricité différentes.
PCT/DE1991/000643 1990-08-14 1991-08-12 Agencement de reflecteurs pour la chambre de pompage d'un laser WO1992003859A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4025747.9 1990-08-14
DE19904025747 DE4025747A1 (de) 1990-08-14 1990-08-14 Reflektoranordnung fuer die pumpkammer eines lasers

Publications (1)

Publication Number Publication Date
WO1992003859A1 true WO1992003859A1 (fr) 1992-03-05

Family

ID=6412228

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000643 WO1992003859A1 (fr) 1990-08-14 1991-08-12 Agencement de reflecteurs pour la chambre de pompage d'un laser

Country Status (2)

Country Link
DE (1) DE4025747A1 (fr)
WO (1) WO1992003859A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6731065B1 (en) 2000-06-05 2004-05-04 Xcounter Ab Apparatus and method for radiation detection with radiation beam impinging on photocathode layer at a grazing incidence
US6815637B2 (en) 2002-02-28 2004-11-09 Retainagroup Limited Apparatus for marking a vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521178A (en) * 1968-05-10 1970-07-21 Horst Herbrich Continuously emitting solid-state laser device
DE2646692A1 (de) * 1976-10-15 1978-04-20 Siemens Ag Optischer sender oder verstaerker (laser)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE176429C (fr) *

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521178A (en) * 1968-05-10 1970-07-21 Horst Herbrich Continuously emitting solid-state laser device
DE2646692A1 (de) * 1976-10-15 1978-04-20 Siemens Ag Optischer sender oder verstaerker (laser)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6731065B1 (en) 2000-06-05 2004-05-04 Xcounter Ab Apparatus and method for radiation detection with radiation beam impinging on photocathode layer at a grazing incidence
US6815637B2 (en) 2002-02-28 2004-11-09 Retainagroup Limited Apparatus for marking a vehicle

Also Published As

Publication number Publication date
DE4025747A1 (de) 1992-02-20

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