DE102004051294A1 - Method for producing a quartz glass component for a laser and laser component - Google Patents

Method for producing a quartz glass component for a laser and laser component

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Publication number
DE102004051294A1
DE102004051294A1 DE200410051294 DE102004051294A DE102004051294A1 DE 102004051294 A1 DE102004051294 A1 DE 102004051294A1 DE 200410051294 DE200410051294 DE 200410051294 DE 102004051294 A DE102004051294 A DE 102004051294A DE 102004051294 A1 DE102004051294 A1 DE 102004051294A1
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DE
Germany
Prior art keywords
laser
quartz glass
characterized
winding arrangement
shaped part
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
DE200410051294
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German (de)
Inventor
Gerhard Schötz
Jan Vydra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heraeus Tenevo GmbH
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Heraeus Tenevo GmbH
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Filing date
Publication date
Application filed by Heraeus Tenevo GmbH filed Critical Heraeus Tenevo GmbH
Priority to DE200410051294 priority Critical patent/DE102004051294A1/en
Publication of DE102004051294A1 publication Critical patent/DE102004051294A1/en
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00Re-forming shaped glass
    • C03B23/04Re-forming tubes or rods
    • C03B23/06Re-forming tubes or rods by bending
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/10Non-chemical treatment
    • C03B37/14Re-forming fibres or filaments, i.e. changing their shape
    • C03B37/15Re-forming fibres or filaments, i.e. changing their shape with heat application, e.g. for making optical fibres
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/0602Crystal lasers or glass lasers
    • H01S3/061Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06708Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
    • H01S3/094019Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16Solid materials
    • H01S3/1601Solid materials characterised by an active (lasing) ion
    • H01S3/1603Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1618Solid materials characterised by an active (lasing) ion rare earth ytterbium
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16Solid materials
    • H01S3/1691Solid materials characterised by additives / sensitisers / promoters as further dopants
    • H01S3/1693Solid materials characterised by additives / sensitisers / promoters as further dopants aluminium
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16Solid materials
    • H01S3/17Solid materials amorphous, e.g. glass
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16Solid materials
    • H01S3/17Solid materials amorphous, e.g. glass
    • H01S3/176Solid materials amorphous, e.g. glass silica or silicate glass

Abstract

In a known method for producing a component made of quartz glass for a laser, a cylindrical shaped part with a core of laser-active quartz glass is produced, which has a cylindrical outer surface and a frontal Auskoppelende for laser radiation and which is formed into a coil assembly and fixed in this form. To provide a simple and cost-effective method for the production of a laser component made of laser-active quartz glass, in which pumping light can be coupled into the core area via the cylinder jacket with high efficiency, it is proposed according to the invention that the cylindrical shaped part has a temperature above one during the forming of the winding arrangement Deformation temperature at which the quartz glass is plastically deformable. A laser component designed according to the invention is characterized by a winding arrangement which is designed to be self-supporting from a plastically deformed molded part.

Description

  • The The present invention relates to a process for producing a Quartz glass component for one Laser by a cylindrical Molded part is produced with a core of laser-active quartz glass, that is a cylinder surface and has a frontal Auskoppelende for laser radiation, and formed into a winding assembly and fixed in this form becomes.
  • Farther The invention relates to a laser device comprising one in the form of a Winding arrangement fixed cylindrical shaped part with a core made of laser-active quartz glass, which has a cylindrical surface and has a frontal Auskoppelende for laser radiation.
  • laser Writer Contains quartz glass Dopants which cause a discharge or amplification of laser radiation in the Host material quartz glass cause. This is usually to rare earth cations (lanthanoids) or to cations of the so-called transition metals.
  • In The communication technology becomes components made of laser-active quartz glass For example, used as a so-called fiber amplifier. Fiber amplifiers can be losses in optical fibers in the optical data transmission compensate by so-called "optical Pumps "laser light is coupled into the fiber core, the laser-active ions in the quartz glass stimulates. The light pulse passing through the fiber core takes energy in addition to the excited ions and is reinforced by it. alternative can do this the laser-active ions by the coupled pump light itself be excited for the delivery of laser light, as in high-power fiber lasers the case is.
  • One special attention is always paid to the highest possible output power and with that, a big one to provide laser active cross-sectional volume, so that fibers with a large outer diameter are usually used.
  • in the In the simplest case, the pump light is coupled into the front side of the fiber and at the core of the fiber is guided by total reflection, making it the core area traverses the fiber repeatedly. However, the core diameter of an optical fiber is small, so that is over the face the fiber only a few pump light can be coupled into the fiber core.
  • In order to increase the excitation energy, it is therefore generally known to couple pumping light into the fiber core via the lateral surface of the fiber. Because of the length of the fiber, the lateral surface is many times larger than the fiber end face. However, this procedure meets the following difficulties:
    The pump light passes through the fiber core only once, so that its energy is usually not completely absorbed and therefore remains partially unused.
  • To reduce this disadvantage, is in the EP 0 840 410 B1 an optical device of the aforementioned type proposed in which the optical conductor is arranged in conglomerate form by repeated folding and winding. To. Fixation of the fiber conglomerate is a UV-curable and transparent to the excitation wavelength resin. Alternatively, an embodiment is proposed in which the fiber is wound up as a flat spiral and sandwiched between two round glass plates having an outside diameter of 15 cm and a thickness of 1 mm. This sandwich arrangement is then treated at a pressure of 50 bar and a temperature of 1500 ° C, so that the glass plates plastically deform, fill the Lükken the fiber spiral, and fix them so. The optical fiber spiral fixed in conglomerate form is irradiated with the pumping light via its lateral surface.
  • Another device of this kind is also used in the US 6,178,187 B1 proposed. As Konglomeratform here is for example a ball in the form of a loose, irregular accumulation of the glass fiber or a regular winding arrangement proposed in the form of a coil. The mechanical fixation of the conglomerate form takes place by embedding in a UV-curable resin or in a zinc or aluminum block.
  • Optical fibers are usually provided directly with a plastic protective sheath, which protects the fiber surface from mechanical damage and chemical attack. Triggers of fiber breaks are almost without exception damage to the surface. A fiber with unprotected fiber surface is difficult to handle and withstands only low mechanical loads. A surface under mechanical stress also ages rapidly, for example as a result of chemical reactions of the SiO 2 with water. Especially with small bending radii and a correspondingly highly mechanically biased fiber emanating from the surface damage or chemical attack (aging) therefore quickly lead to fiber breakage, so that the protective jacket brings a significant extension of life compared to an uncoated fiber with it. Similarly, the fixation masses described above for the fixation of the fibers act in conglomerate form. However, hinder both the protective sheath and such fixation measure the lateral coupling of the pump light. In addition, the operating temperature of the fibers is limited to temperatures below the decomposition or melting point of the plastic or the fixing mass, which at the same time results in a limitation with respect to the maximum possible pump power.
  • One Another problem is that straight optical fibers, the with regard to a possible high power output a big one Have core cross section, because of their larger outer diameter a small have minimal bending radius. Narrow windings to produce more compact and dense conglomerate forms are therefore not with these fibers readily realizable. It can while fiber breaks and impairments of lighting occur in the fiber core due to stress birefringence.
  • In WO 95/23771 is a holder for the production of optical fiber coils for the "Farraday effect" Winding a monomode fiber produces a fiber coil which placed in the holder, and then at high temperature in an oven, for example in the range between 550 ° to 1250 ° C, several Annealed for hours. This will be the existing bending stresses and an associated stress birefringence in the quartz glass the fiber coil degraded.
  • Also in this process is the initial one outer diameter the fiber coil through the minimum bending radius of the optical fiber used limited to the bottom.
  • Of the Invention is therefore the object of a simple and inexpensive Procedure for indicate the production of a laser component of laser-active quartz glass, in which pumping light with high efficiency over the cylinder jacket in the Core area can be coupled. Furthermore, the invention is the task is based, such a laser device of laser active To provide quartz glass.
  • Regarding of the method, this object is based on the above-mentioned Process according to the invention thereby solved, that the cylindrical Molded when placed to the winding assembly a temperature above a deformation temperature at which the quartz glass is plastic is deformable.
  • The component to be produced is formed by a winding arrangement in which the cylindrical shaped part is present as compact as possible accumulation in orderly or in disordered form, and which serves the purpose of using as effectively as possible over the cylindrical surface of the cylindrical shaped part irradiated pumping light. The following aspects are particularly important in the process according to the invention in the fulfillment of this purpose:
    • On the one hand, the method according to the invention makes it possible to produce particularly narrow bending radii in the production of the winding arrangement. This is achieved by heating the quartz glass to a temperature at which it is plastically deformable during the production of the winding arrangement. The plastic deformation makes it possible to impose even narrow bending radii on cylindrical shaped parts with a large diameter, without the formation of excessive stresses or even fractures.
    • • To change it may be necessary to dispense with an otherwise necessary to protect the optical fiber sheathing of the molding. Because due to the plastic deformation in the manufacture of the winding assembly, the molding has no or only low mechanical stresses, so that stress-induced fractures and aging effects do not occur. Also, in the manufacture of the molded article and during winding, surface damage generated is at least partially melted and thereby eliminated. The invention thus opens the possibility for the first time to realize tight bending radii (even with a large fiber diameter) without a protective jacket.
    • Furthermore, a mechanical fixation of the winding arrangement by means of a fixing compound or a holder - as known from the prior art - not required. Such fixatives hinder the lateral coupling of pumping light in the fiber cladding; wherein a fixing compound in this regard acts similarly disadvantageous as a plastic protective jacket. In contrast, the plastically deformed winding arrangement is dimensionally stable even without supporting and fixing measures, a property which is referred to below as "self-supporting".
  • at the cylindrical one Molded part is a strand of any radial cross-section, in particular a fiber, a rod or a hollow cylindrical Component with central core area made of laser-active quartz glass. Of the Core area may consist of one or more cladding glass layers be surrounded doped or undoped quartz glass.
  • The deformation temperature is a temperature above which the relaxation times for the rearrangement of the glass structure are on the order of the deformation times chosen in practice. The required deformation temperature depends on the doping of the quartz glass and on the deformation mungsgeschwindigkeiten when forming the winding assembly. At low deformation speeds (long deformation time), a lower temperature is sufficient. It is essential that the molding is plastically deformable at the deformation temperature in finite times without significant stresses occurring. Suitable deformation temperatures are easy to determine based on a few experiments and are below 1680 ° C.
  • The property called "self-supporting" the winding arrangement closes a holder when used in a laser device is not, as a result it also leads to elastic deformation of the winding arrangement can come. For example, the winding arrangement is between Clamps holding parts while elastically deformed, or she can deform elastically due to their own weight. It acts but it is usually elastic deformations of plastic deformed, self-supporting winding arrangement in total.
  • The cylindrical shaped part has a core region consisting of quartz glass which is doped with laser-active ions. However, the SiO 2 content of the core quartz glass far outweighs all other components and is at least 85 wt .-%. The core region is circular or annular in radial cross-section and surrounded by at least one cladding glass.
  • Especially advantageous designed a procedure in which the cylindrical shaped part pulled a semifinished product and pulling in one on the deformation temperature heated state to form the winding assembly to a carrier is wound up.
  • at the semifinished product is a massive, so-called preform, are pulled out of the optical fibers, or it is about a coaxial arrangement of a plurality of cylindrical quartz glass components, comprising a quartz glass core rod and at least one core rod enveloping Casing pipe.
  • The Production of the cylindrical Molded part by elongating the semifinished product and producing the Winding arrangement take place here in one operation. The semi-finished product is softened zone by zone starting from one end in a heating zone and from the softened area to form a drawing onion cylindrical Molded part removed as quartz glass strand.
  • The Forming the winding assembly from the withdrawn molding can take place in an area immediately below the drawing onion, in which the molding is still plastically deformable. It has become though another procedure has proven particularly advantageous in which the drawn from the semi-finished molding cooled and first before winding on the carrier is heated to the deformation temperature.
  • At the cooling down solidifies the cylindrical molding and takes in the area below the drawing bulb its final cross-sectional shape one. It can be checked whether a given target geometry is complied with and, if necessary, it can be readjusted. Only then is the cylindrical Molding to a temperature above the deformation temperature brought and formed into the winding assembly.
  • at an alternative and equally preferred procedure becomes the cylindrical shaped part drawn from a semi-finished product, in a separate process step heated to the deformation temperature and in the heated state below Forming the winding assembly wound on a support.
  • The Production of the cylindrical Molded part by elongating the semifinished product and producing the Winding arrangement take place here in separate operations. Thereby can the process parameters - in particular Pulling speed and take-up speed - for everyone the operations independently be optimized from each other. The outer diameter of the carrier determines the minimum inner diameter of the winding assembly.
  • It has proved its worth, the molding to a at least one winding layer having Coil or to wind a spiral.
  • The Coil consists of a generally hollow core with a given, preferably narrow diameter of one layer or several layers of the ordered or disordered wound molding is limited. This arrangement ensures reproducible properties of the laser component to be produced.
  • While the winding arrangement in the form of the coil along the coil axis extends, runs the spiral in a plane around its central axis. The Wick lungsanordnung In this case, there is at least one spiral. In the case of one several spiral winding arrangement comprising these are advantageously visually interconnected by making a common molding are wound.
  • Preferably has the cylindrical shaped part an outer diameter of 200 μm or more.
  • The inventive method allows the production of winding arrangements, in spite of cylindrical shaped part with big outer diameter have a tight bend radius. This allows a compact design of the laser-active component with simultaneously large excitation and emission cross-section and thereby affects one hand, on the one hand into the core area of the Part to be coupled pumping power and on the other hand on the to be emitted output power advantageous.
  • In the context, it has proved to be particularly advantageous when the cylindrical molding in the winding has a bending radius of 10 cm or less.
  • Regarding the laser component, this task is based on the above mentioned component according to the invention thereby solved, that the winding arrangement is self-supporting from a plastically deformed Molded part is formed.
  • at the cylindrical one Molded part is a strand of any radial cross-section, in particular to an optical fiber, a rod or a pipe with central core area of laser-active quartz glass. The core area can be doped by one or more cladding glass layers of surrounded undoped quartz glass.
  • The to be produced laser component is formed by a winding arrangement, in the cylindrical one Molded part plastically deformed in an ordered or disorderly, preferably compact buildup present, which serves the purpose over the cylinder surface of the cylindrical one Use molded part pumped-in light as effectively as possible.
  • The following aspects are particularly important in the laser device according to the invention in the fulfillment of this purpose:
    • • On the one hand, the molded part is in plastic deformation. This state makes it possible to use cylindrical shaped parts with a large diameter and almost any narrow bending radii, without causing excessive tensions or even fractures.
    • • To change the laser device according to the invention can be dispensed with an otherwise necessary to protect the optical fiber sheathing of the molding. Because of its plastic deformation state, the molding has no or only low mechanical stresses, so that stress-induced fractures and aging effects do not occur. The invention thus opens the possibility for the first time to realize tight bending radii (even with a large fiber diameter) without a protective jacket.
    • Furthermore, a mechanical fixation of the winding arrangement by means of a fixing compound or a holder - as known from the prior art - not required. Such fixatives hinder the lateral coupling of pumping light in the fiber cladding; wherein a fixing compound in this regard acts similarly disadvantageous as a plastic protective jacket. In contrast, the winding arrangement is dimensionally stable and "self-supporting" even without supporting and fixing measures, which is understood here as meaning a winding arrangement which requires no supporting body or fixing means to stabilize its shape Shading of pump light, and allows use even at high thermal stress and especially at high pumping light power.
  • The Production of the laser component according to the invention is preferably carried out on the basis of the method according to the invention described above by plastic deformation of the cylindrical molding.
  • The as "self-supporting Training " Property of the winding arrangement closes its support during use in a laser device is not, whereby it leads to an elastic deformation of the Winding arrangement can come. For example, the winding arrangement becomes clamped between holding parts and thereby slightly deformed, or she may deform elastically due to her own weight. These are usually elastic deformations the plastically deformed, self-supporting winding arrangement as a whole.
  • The cylindrical shaped part has a core region consisting of quartz glass which is doped with laser-active ions. However, the SiO 2 content of the core quartz glass far outweighs all other components and is at least 85 wt .-%. The core region is circular or annular in radial cross-section and surrounded by at least one cladding glass.
  • in the Ideally, the molded part and the laser component formed therefrom exist Completely made of quartz glass.
  • The The molded part is neither embedded in a fixation compound, as in the above mentioned prior art, nor does it have a sheath what, on the coupling of the pump light on the cylinder outer jacket beneficial effect and use at high thermal stress allows.
  • Preferably the self-supporting winding arrangement comprises a self-supporting Coil or a self-supporting spiral.
  • The Component according to the invention is formed by a coil that of the cylindrical molding in a single layer or as compact as possible multiple winding layers present. The coil consists of a in usually hollow spool core with a given, as narrow as possible diameter, that of several layers of the orderly or disorderly wound up Form part is limited. The coil serves the purpose over the Cylinder jacket surface of the cylindrical one Use molded part pumped-in light as effectively as possible.
  • in the Contrary to a winding arrangement in the form of a coil, which itself extends along the coil axis, runs a winding arrangement in the form of a spiral in a plane around the spiral central axis. The winding arrangement consists in the case of at least one Spiral. In the case of a multi-spiral winding arrangement these advantageously optically interconnected by are wound from a common molding.
  • Preferably has the cylindrical shaped part an outer diameter of 200 μm or more, and in the winding assembly, a bending radius of 10 cm or less.
  • A Such a winding arrangement provides a large excitation and emission cross section available allows the coupling of a high pumping light power into the core area of the molding and guaranteed a high and reproducible output power of the laser device according to the invention.
  • following the invention is based on embodiments and a Drawing explained in more detail. In the drawing show in detail in a schematic representation
  • 1 an embodiment for the manufacture of the laser device according to the invention when pulling a quartz glass rod from a preform and by winding the heated quartz glass rod to a rigid, self-supporting optical fiber coil, and
  • 2 an enlarged view of the optical fiber coil of 1 in a view of the coil surface (in section).
  • 1 shows a preform 1 consisting of a 15 mm diameter core of laser active quartz glass doped with 0.7 mol% Yb 2 O 3 and 5.0 mol% Al 2 O 3 , and a cladding layer surrounding the core region undoped quartz glass with a layer thickness of 1.5 mm. The preform 1 Beginning with its lower end, it is continuously drawing a go 2 supplied and softened in zones. From the softened area, forming an onion 3 a thin rod 4 with an outer diameter of 400 microns with a pulling speed of 5 m / min by means of a tractor 5 deducted. The diameter and ovality of the withdrawn rod 4 are measured continuously and adjusted to preset setpoints.
  • Below the tractor 5 the withdrawn rod passes through 4 a ring furnace 7 , which is set at a temperature of 1600 ° C, and in which the rod 4 heated zone by zone so that it at the end of the ring furnace 7 has a viscosity averaged over the diameter log η of about 9.5 dPas.
  • In a process modification is used to heat and soften the rod 4 instead of the ring furnace 7 a burner used.
  • The softened bar section 6 is immediately after leaving the ring furnace 7 on an Al 2 O 3 carrier tube 8th wound around its longitudinal axis 10 rotated and in the direction of the longitudinal axis 10 the procedure is that the rod 4 forming a cylindrical coil 9 with adjacent coil turns 11 (please refer 2 ) is plastically deformed. In this molding process, the heated rod section 6 a temperature that allows plastic deformation substantially without the formation of mechanical stresses.
  • After finishing the coil 9 becomes the carrier tube 8th away. The self-supporting coil thus produced 9 is based 2 described in more detail.
  • The dimensions of the coil depend on the specific requirements, wherein the method according to the invention enables, in particular, the production of a light conductor coil with a particularly small inner diameter. In the embodiment, the coil has 9 a the outer diameter of the Al 2 O 3 carrier tube 8th corresponding inner diameter of 5 cm, an outer diameter of 5.14 cm and a length of 10 cm. It consists of two layers 14 in which the winding sections of the drawn and formed rod 4 as close as possible and essentially without gap on each other and on top of each other. The sink 9 is rigid and self-supporting.
  • The term "self-supporting coil" is used in electrical engineering for electronic coils which do not require an independent bobbin that supports them.
  • The light guide coil 9 serves as an optical component for the amplification of laser light that passes over both ends of the wound rod 6 can be coupled into the core area or disconnected. Additional pump light is over the cylinder jacket 15 the coil 9 coupled into the doped core region.
  • The inventive method and the resulting stress-free or low-tension design of the coil 9 makes it possible to dispense with a protective jacket or on the known fixative. The absorption and reflection losses associated with these protective and fixing measures as well as the restrictions on the operating temperature and the maximum pumping light power are thus avoided.
  • To make an easy-to-use laser device is the coil 9 fixed by means of quartz glass plates, which are opposite to each other at the coil end faces and which are interconnected. In doing so, the coil becomes 9 carefully compressed so far that the individual turns lie against each other without a gap.
  • In an alternative embodiment of the laser component according to the invention, the winding arrangement is designed as a fiber spiral, as in the aforementioned EP 0 840 410 B1 described. In contrast, however, the spiral is self-supporting in that the fiber forming it is plastically deformed into the spiral shape. The spiral thus prepared is, as also in the EP 0 840 410 B1 described sandwiched between two quartz glass plates whose outer diameter corresponds to the outer diameter of the spiral. By this fixation of the spiral, the handling of the thus obtained laser device is improved, wherein the spiral can be slightly elastically deformed when clamping between the quartz glass plates. A further fixation of the fiber by melting the quartz glass plates is indeed possible, but not required.

Claims (12)

  1. Method for producing a quartz glass component for a laser, in which a cylindrical shaped part ( 4 ) is produced with a core of laser-active quartz glass, which has a cylindrical outer surface and an end-side decoupling end for laser radiation, and which leads to a winding arrangement ( 9 ) is shaped and fixed in this form, characterized in that the cylindrical shaped part ( 4 ) when forming the winding arrangement ( 9 ) has a temperature above a deformation temperature at which the quartz glass is plastically deformable.
  2. Method according to claim 1, characterized in that the cylindrical shaped part ( 4 ) from a semi-finished product ( 1 ) and pulled in a heated to the deformation temperature state to form the winding assembly ( 9 ) on a support ( 8th ) is wound up.
  3. A method according to claim 2, characterized in that the from the semifinished product ( 1 ) drawn molding ( 4 ) and before being wound on the carrier ( 8th ) is heated to the deformation temperature.
  4. Method according to claim 1, characterized in that the cylindrical shaped part ( 4 ) from a semi-finished product ( 1 ), then heated to the deformation temperature and in the heated state to form the winding assembly ( 9 ) on a support ( 8th ) is wound up.
  5. Method according to one of the preceding claims, characterized in that the molded part ( 4 ) to at least one winding layer ( 14 ) having coil ( 9 ) or wound into a spiral.
  6. Method according to one of the preceding claims, characterized in that the cylindrical shaped part ( 4 ) has an outer diameter of 200 μm or more.
  7. Method according to one of the preceding claims, characterized in that the cylindrical shaped part ( 4 ) in the winding arrangement ( 9 ) has a bending radius of 10 cm or less.
  8. Laser component comprising one in the form of a winding arrangement ( 9 ) fixed, cylindrical shaped part ( 4 ) having a core of laser-active quartz glass, which has a cylindrical outer surface and a frontal Auskoppelende for laser radiation, characterized in that the winding arrangement ( 9 ) self-supporting from a plastically deformed molded part ( 4 ) is trained.
  9. Laser component according to claim 8, characterized that the laser component is complete made of quartz glass.
  10. Laser component according to claim 8 or 9, characterized in that the self-supporting winding arrangement a self-supporting coil ( 9 ) or a self-supporting spiral.
  11. Laser component according to one of claims 8 to 10, characterized in that the molded part ei nen outer diameter of 200 microns or more.
  12. Laser component according to one of claims 8 to 11, characterized in that the cylindrical shaped part ( 4 ) in the winding arrangement ( 9 ) has a bending radius of 10 cm or less.
DE200410051294 2004-10-20 2004-10-20 Method for producing a quartz glass component for a laser and laser component Ceased DE102004051294A1 (en)

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DE200410051294 DE102004051294A1 (en) 2004-10-20 2004-10-20 Method for producing a quartz glass component for a laser and laser component
PCT/EP2005/011023 WO2006045443A1 (en) 2004-10-20 2005-10-13 Method for producing a quartz glass component for a laser and laser component

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DE102007045488A1 (en) 2007-09-14 2009-04-16 Heraeus Quarzglas Gmbh & Co. Kg Side pumped laser

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FR2958403B1 (en) * 2010-04-01 2013-04-05 Univ Rennes Evanescent infrared wave sensor and method for manufacturing the same

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DE472315C (en) * 1929-02-26 Milos Klavik A process for preparing schraubenfoermig winding glassticks
WO1995023771A1 (en) * 1994-03-03 1995-09-08 Minnesota Mining And Manufacturing Company Holder for annealing fiber optic coils
DE19517952A1 (en) * 1995-05-16 1996-11-21 Ams Optotech Vertrieb Gmbh Optical amplifier with praseodymium-doped optical fiber
EP0840410B1 (en) * 1996-10-31 2000-12-27 Hoya Corporation Laser apparatus
US6178187B1 (en) * 1996-10-31 2001-01-23 Kenichi Ueda Optical fiber laser device

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US6826335B1 (en) * 1909-04-30 2004-11-30 The University Of Southampton Multi-fibre arrangements for high power fibre lasers and amplifiers
JPH07237932A (en) * 1994-02-28 1995-09-12 Hitachi Cable Ltd Production of bent optical fiber, light-amplifier and optical part
JP4229536B2 (en) * 1999-07-26 2009-02-25 浜松ホトニクス株式会社 Optical medium manufacturing method, laser device manufacturing method, optical amplifier manufacturing method
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DE472315C (en) * 1929-02-26 Milos Klavik A process for preparing schraubenfoermig winding glassticks
WO1995023771A1 (en) * 1994-03-03 1995-09-08 Minnesota Mining And Manufacturing Company Holder for annealing fiber optic coils
DE19517952A1 (en) * 1995-05-16 1996-11-21 Ams Optotech Vertrieb Gmbh Optical amplifier with praseodymium-doped optical fiber
EP0840410B1 (en) * 1996-10-31 2000-12-27 Hoya Corporation Laser apparatus
US6178187B1 (en) * 1996-10-31 2001-01-23 Kenichi Ueda Optical fiber laser device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007045488A1 (en) 2007-09-14 2009-04-16 Heraeus Quarzglas Gmbh & Co. Kg Side pumped laser

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