a detailed description of embodiments of the present invention is provided with reference to fig1 to 3 . fig1 schematically shows a laser system including a laser device 1 having a coupler 2 for a laser fiber , and a laser fiber 3 provided for being coupled to the laser device 1 and having a connector 4 fitting to the coupler 2 . a read and write data carrier 17 is incorporated into the connector 4 of the laser fiber 3 . this read and write data carrier may contain information 5 related , for example , to the model of the laser fiber 3 and its properties , the permissible operation parameters as well as the production date of the laser fiber 3 and a use - by date which may be derived from the former information . this information may be read out by a coding device 6 from the read and write data carrier located 17 in the connector 4 . the coding device 6 may , however , receive this information 5 from another source not depicted here . from the laser device 1 the coding device 6 receives an identification code 7 assigned to the laser device 1 as a further input information . using a coding algorithm , the coding device 6 generates an identification code 8 for the laser fiber 3 based on the information 5 and the identification code 7 of the laser device 1 . the coding device 6 writes this identification code 8 in the read and write data carrier 17 included in the connector 4 . the coding algorithm according to which the identification code 8 is generated based on the identification code 7 and the information 5 is to be kept secret , whereas both the identification code 7 and the identification code 8 and the information 5 may be freely accessible . the coding device 6 is for example used in a manufacturing plant in which the laser fiber 3 is produced or prepared . in this case , the information 5 is usually supplied by another source than the laser fiber 3 itself and may be stored together with the identification code in the read and write data carrier 17 . the coding device 6 may also be used by a reseller , who provides laser fibers 3 from a stock with an identification code 8 for use with a particular laser device 1 individualized by the identification code 7 . fig2 shows the laser fiber 3 with its connector 4 inserted into the coupler 2 of the laser device 1 . the laser device 1 reads the identification code 8 from the connector 4 or the read and write data carrier located therein , and compares this identification code 8 with its stored identification code 7 prior to coupling laser light into the laser fiber 3 . fig3 shows the parts of the laser device 1 and the steps executed in the laser device 1 which are essential for the present invention . the laser device 1 comprises a laser 9 for coupling laser light 10 into the laser fiber 3 connected to the coupler 2 via its connector 4 . the laser 9 is controlled via control signals 11 from a controller 12 . the controller 12 reads the identification code 8 of the laser fiber 3 in that it for example queries the read and write data carrier located in the connector 4 and having the form of a transponder . based on an algorithm which also has to be kept secret , the controller 12 compares the identification code 8 with the identification code 7 which is permanently programmed into a memory 13 . based on this comparison the controller 12 determines whether the laser fiber 3 is intended for use with the present laser device 1 so that the laser 9 may be activated in general . additionally , the controller 12 queries a further memory 14 in which records of use 15 are kept for all laser fibers 3 the identification codes 8 of which have already been read - in by the controller 12 . from the records of use 15 the controller 12 determines whether the actual laser fiber 3 has already been used - up , for example , due to a number of already occurred single uses or a period of time elapsed since its first use , or a maximum total duration of use , or a maximum amount energy coupled - in so that it is not suitable for further uses . in this case , the laser 9 is not activated by the operation signal 11 . no activation also occurs , if an absolute use - by date of the laser fiber 3 included in the identification code 8 is exceeded . in all other cases , the laser 9 is activated by the operation signal 11 , and the laser couples laser light 10 in the laser fiber 3 . the controller 12 keeps a record of this use of the laser fiber 3 in that it writes use data 16 in the memory 17 to continue the record of use 15 . the identification code 7 may be supplied by the user of the laser device 1 when ordering a laser fiber 3 for the laser device 1 orally , in writing or digitally . similarly , the identification code 8 of the laser fiber 3 may be transmitted in various ways . it may be printed as a simple figure on the packaging of the laser fiber 3 , and entered in the laser device 1 by the user via a keypad ( nor depicted here ). the laser device 1 may also have a barcode scanner ( also not depicted here ) via which a barcode coding the identification code 8 may be read . such a barcode can be provided on the laser fiber 3 , its connector 4 or on a label attached thereto , or on a separate card or even on the packaging of the laser fiber 3 . the read and write data carrier which has been described previously does also not have to be a part of the laser fiber 3 , and it is only one of a number possible embodiments with regard to transmitting the identification code 8 to the laser device 1 which are obvious to those skilled in the art . many variations and modifications may be made to the preferred embodiments of the invention without departing substantially from the spirit and principles of the invention . all such modifications and variations are intended to be included herein within the scope of the present invention , as defined by the following claims .
for operating a laser device to which an identification code is assigned in combination with a laser fiber depending on an identification code assigned to the laser fiber , the identification code assigned to the laser fiber is generated depending on the identification code of the laser device and compared by the laser device with its own identification code in such a way that the laser fiber may only be used in combination with the particular laser device .