Highly stable broadband light source and suitable stabilization method therefor

A method for highly stabilizing a broadband light source, comprising the following steps:

• emission of light by means of a semiconductor light source with a specific emission spectrum;
• emission of light by means of a number of optical filters with specific bandpass filtering functions and specific bandwidths;
• coupling of the emitted light in a coupling element, to which the light emissions of the semiconductor light source and of the number of optical filters are fed and at the output of which the light emission of the broadband light source is effected,
• the spectrum of the light emission of the broadband light source being composed of the emission spectrum of the semiconductor light source and the bandpass filtering functions of the number of optical filter;
• and
• stabilization of the wavelengths of the number of optical filters in such a way that the spectrum of the light emission of the broadband light source is essentially determined only by the filtering function of the optical filters
• characterized by the steps of:
• choosing the number of optical filters to be two;
• providing two photodetectors;
• assigning a respective one of the optical filters to a respective one of the photodetectors and detecting the spectrum transmitted by the assigned optical filter;
• feeding the spectrum to a divider;
• and
• comparing the detected spectra in the divider.