Method and device for operating a laser light source

A computer program product having a program code for carrying out a method when the computer program product is executed on an electronic control unit or is stored on a computer-readable data carrier, the method being for operating a laser light source, and comprising:

• a) cyclically ascertaining an electrical voltage drop at the laser light source by energizing the laser light source;
• b) cyclically ascertaining a temperature of the laser light source from the ascertained electrical voltage drop with an aid of a first mathematical connection previously ascertained from the electrical voltage drop and the temperature of the laser light source;
• c) ascertaining a current which causes an essentially constant visual output of the laser light source for each ascertained temperature value with an aid of a second mathematical connection from the visual output and the current;
• and
• d) energizing the laser light source using the current.